J/ApJS/275/1ivo://CDS.VizieR/J/ApJS/275/1CDSBinder B.A.Peacock S.Schwieterman E.W.Turnbull M.C.Virgen A.Y.,Kane S.R.Farrish A.Garcia-Sage K.2025-10-01T06:29:29Z2025-09-11T08:18:37ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frdwarf-starsx-ray-sourcesstellar-spectral-typesstellar-agesstellar-massesstellar-distanceStellar X-ray and UV radiation can significantly affect the survival, composition, and long-term evolution of the atmospheres of planets in or near their host star's habitable zone (HZ). Especially interesting are planetary systems in the solar neighborhood that may host temperate and potentially habitable surface conditions, which may be analyzed by future ground- and space-based direct-imaging surveys for signatures of habitability and life. To advance our understanding of the radiation environment in these systems, we leverage ~3Ms of XMM-Newton and Chandra observations in order to measure three fundamental stellar properties at X-ray energies for 57 nearby FGKM stellar systems: the shape of the stellar X-ray spectrum, the luminosity, and the timescales over which the stars vary (e.g., due to flares). These systems possess HZs that will be directly imageable to next-generation telescopes such as the Habitable Worlds Observatory and ground-based Extremely Large Telescopes. We identify 29 stellar systems with LX/Lbol ratios similar to (or less than) that of the Sun; any potential planets in the HZs of these stars therefore reside in present-day X-ray radiation environments similar to (or less hostile than) modern Earth, though a broader set of these targets could host habitable planets. An additional 19 stellar systems have been observed with the Swift X-ray Telescope; in total, only ~30% of potential direct imaging target stars has been observed with XMM-Newton, Chandra, or Swift.2024ApJS..275....1Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/275/1CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/119 : Spectral classifications of proper motion stars (Bidelman+ 1985)IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)I/350 : Gaia EDR3 (Gaia Collaboration, 2020)V/117 : Geneva-Copenhagen Survey of Solar neighbourhood (Holmberg+, 2007)V/130 : Geneva-Copenhagen Survey of Solar neighbourhood III (Holmberg+, 2009)J/A+A/356/529 : Catalogue of wide binaries (Allen+ 2000)J/ApJ/571/512 : Distances of white dwarf stars (Holberg+, 2002)J/AJ/126/2048 : NStars project: the Northern Sample. I. (Gray+, 2003)J/A+A/415/391 : CORALIE survey for extrasolar planets. XII (Mayor+, 2004)J/AJ/132/161 : NStars project: The southern sample. I. (Gray+, 2006)J/ApJ/646/523 : Exoplanet systems with stellar companions (Raghavan+, 2006)J/ApJS/168/297 : Stellar parameters of nearby cool stars (Takeda+, 2007)J/MNRAS/389/585 : Fundamental parameters of M dwarfs (Casagrande+, 2008)J/ApJ/687/1264 : Age estimation for solar-type dwarfs (Mamajek+, 2008)J/A+A/488/635 : HD 203608 radial velocity (Mosser+, 2008)J/ApJ/720/1290 : Abundances of stars hosting planets (Ghezzi+, 2010)J/A+A/534/A58 : HD20794, HD85512, HD192310 HARPS RVels (Pepe+, 2011)J/AJ/144/56 : Speckle interferometry at SOAR in 2012 (Tokovinin+, 2012)J/A+A/556/A126 : GJ667C Doppler & activity (Anglada-Escude+, 2013)J/A+A/549/A109 : HARPS XXXI. The M-dwarf sample (Bonfils+, 2013)J/MNRAS/435/2077 : Properties of Sirius-like binary systems (Holberg+, 2013)J/A+A/556/A150 : SWEETCat I. Stellar param. for host stars (Santos+, 2013)J/MNRAS/443/L89 : Kapteyn's star sp. measurements (Anglada-Escude+ 2014)J/A+A/577/A128 : CARMENES input cat. of M dwarfs. I (Alonso-Floriano+, 2015)J/ApJ/809/8 : Terrestrial planet occurrence rates for KOIs (Burke+, 2015)J/ApJ/804/64 : Empirical and model parameters of 183 M dwarfs (Mann+, 2015)J/ApJ/817/L20 : Wolf 1061 velocities and planet candidates (Wright+, 2016)J/A+A/602/A88 : 5 M dwarfs radial velocity curves (Astudillo-Defru+, 2017)J/A+A/605/A103 : HD20794 HARPS radial velocities (Feng+, 2017)J/AJ/154/109 : California-Kepler Survey (CKS). III. Radii (Fulton+, 2017)J/AJ/154/200 : Nearby white dwarf/red dwarf pair 40 Eri BC (Mason+, 2017)J/AJ/153/136 : Planets and host stars with Gaia parallaxes (Stassun+, 2017)J/A+A/619/A1 : 55 Cnc radial velocities and photometry (Bourrier+, 2018)J/A+A/619/L10 : pi Men radial velocity curves (Gandolfi+, 2018)J/MNRAS/490/5088 : Stellar companions of exoplanet host stars (Mugrauer, 2019)J/ApJ/872/17 : HAZMAT. V. UV & X-ray of K stars (Richey-Yowell+, 2019)J/AJ/160/129 : HARPS, HIRES and AAT RVel of HD 136352 (Kane+, 2020)J/AJ/162/14 : Astrometry & RVel, Alpha Centauri system (Akeson+, 2021)J/AJ/161/36 : Exoplanets in habitable zone with Kepler (Bryson+, 2021)J/AJ/161/10 : Radial velocities for 4 host stars (Burt+, 2021)J/other/NatAs/5.775 : nu2 Lupi CHEOPS light curves (Delrez+, 2021)J/ApJS/254/10 : Compilation of W UMa stars (Latkovic+, 2021)J/AJ/163/295 : Radial velocity & astrometry for {mu} Arae (Benedict+, 2022)J/A+A/658/A115 : Proxima Cen ESPRESSO RV and FWHM (Faria+, 2022)J/ApJS/262/21 : 3-D selection of 167 sub-stellar companions (Feng+, 2022)J/AJ/163/223 : Radial velocity study of {pi} Mensae (Hatzes+, 2022)J/A+A/666/A143 : AD Leo RV and stellar activity indices (Kossakowski+, 2022)J/AJ/166/46 : EXPRES. IV. Two Additional Planets Orbiting (Brewer+, 2023)J/AJ/165/176 : Doppler constraints in Sun-like star syst. (Laliotis+, 2023)J/A+A/678/A107 : Long-period substellar companions (Philipot+, 2023)J/ApJS/272/30 : Habitable Worlds Observatory (HWO) (Harada+, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/275/1https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/275/1http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/275/1https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/275/1https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/275/1http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/275/1GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/275/1/table1 (Potential target stars for future HZ imaging surveys)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/275/1/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/275/1/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/275/1/table1?GETtext/xml+votable180.050000true1.653266729.02150360.005555555555555556Cone search capability for table J/ApJS/275/1/table2 (Properties of stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/275/1/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/275/1/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/275/1/table2?GETtext/xml+votable180.050000true188.015625-16.19626390.005555555555555556Cone search capability for table J/ApJS/275/1/table9 (Summary of faint star observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/275/1/table9?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/275/1/table9?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/275/1/table9?GETtext/xml+votable180.050000true260.2515606-21.11293640.005555555555555556Cone search capability for table J/ApJS/275/1/table10 (Stars with available Swift/XRT imaging)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/275/1/table10?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/275/1/table10?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/275/1/table10?GETtext/xml+votable180.050000true93.711541719.15563610.0055555555555555566/137 377 684 1341 1603 1875 2317 2472 2737 2923 3020 3036 3102 3118 3639 3932 4438 4444 4854 5009 5074 5304 5420 5522 5534 5670 5836 5853 6066 6766 6926 6941 7264 7595 7763 8109 8145 8466 8476 8788 8790 8985 8995 9072 9125 9403 9476 9835 10225 10375 10812 10899 11290 11403 11633 11636 11806 12592 12944 13301 14180 14266 14278 14419 14459 14522 15311 15356 15861 15962 16069 16105 16391 16412 16678 17171 17425 17576 18139 18496 19323 19466 19585 19912 20100 20145 20328 20896 21060 21177 21484 21568 22040 22309 22708 22807 22818 23140 23190 23230 23369 23675 23974 24028 24151 24160 24212 24713 24777 24793 24924 25056 25407 26583 26972 26975 27973 28605 28664 28696 28955 28987 29196 29239 29255 30505 30576 30665 30771 30878 30965 31073 31087 31101 31433 31478 31751 31781 32619 32645 32757 32848 33211 33281 33340 33552 33717 33849 34181 34446 34817 34896 34905 35064 35079 35351 35948 36145 36365 36446 36664 36693 36697 36983 37408 37595 38064 38238 39284 39500 39709 39744 40078 40242 40692 40932 41272 41591 41763 41941 42248 42253 42285 42290 42459 42652 42700 42760 43074 43639 44284 44557 45485 45535 45564 45668-45669 46113 46247 46566 46632 46640 46776 46925 46982 47101 47137 47414 47589 47740 48334 48355 48652 48705 48768https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/275/1?format=asciiX-raydefaultJ/ApJS/275/1/table1Potential target stars for future HZ imaging surveysrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHD? Henry Draper Catalog identifiermeta.idcharIDCommon Name (spaces removed)meta.id;meta.maincharprimarym_IDComponent name on IDmeta.code.multipcharDist[1/23.3] Distance (inverted Gaia DR3 parallax)pcpos.distance;pos.heliocentricfloatSpTSpectral Typesrc.spTypecharTWIn this work?meta.notecharNsDisplay this work sample data for this star system (link to Table 2)meta.ref.urlintnullableMS24In Mamajek & Stapelfelt (2024arXiv240212414M)?meta.notecharXX-ray observation available?meta.notecharNxDisplay the X-ray observation data for this star system (link to Table 3)meta.ref.urlintnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainSimbadNameSimbad column added by the CDSmeta.idcharnullableJ/ApJS/275/1/table2Properties of starsIDCommon Name (spaces removed), as in other tables; column added by CDSmeta.id;meta.maincharSimbadNameSimbad column added by the CDSmeta.idnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintm_IDComponent name on IDmeta.code.multipcharNameStar Name (1)meta.idONameOther Names, comma separate listmeta.idRAJ2000? Hour of Right Ascension (J2000)pos.eq.ra;meta.mainnullableDEJ2000? Degree of Declination (J2000)pos.eq.dec;meta.mainnullableSpTSpectral Type, from Gray+ 2006, J/AJ/132/161 (2)src.spTypecharDist[1.3/18.3]? Distance (inverted Gaia DR3 parallax)pcpos.distance;pos.heliocentricfloatnullableE_Dist[0.07/0.5]? Upper uncertainty on Distpcstat.error;stat.max;pos.distancefloatnullablee_Dist[0.0003/1]? Lower (or symmetric) Uncertainty on Distpcstat.error;stat.min;pos.distancefloatnullableMstar[0.08/1.5]? Stellar masssolMassphys.massfloatnullableE_Mstar[0.0026/0.3]? Upper uncertainty on MstarsolMassstat.error;stat.max;phys.massfloatnullablee_Mstar[0.002/0.2]? Lower (or symmetric) Uncertainty on MstarsolMassstat.error;stat.min;phys.massfloatnullableTeff[2508/6854]? Stellar effective temperatureKphys.temperature.effectiveintnullableE_Teff[63/188]? Upper uncertainty on TeffKstat.error;stat.max;phys.temperature.effectiveintnullablee_Teff[11/200]? Lower (or symmetric) Uncertainty on TeffKstat.error;stat.min;phys.temperature.effectiveintnullableLbol[0.00049/4.7]? Bolometric luminositysolLumphys.luminosity;phot.flux.boldoublenullableE_Lbol[0.0004/0.3]? Upper uncertainty on LbolsolLumstat.error;stat.max;phys.luminosityfloatnullablee_Lbol[4e-06/0.3]? Lower (or symmetric) Uncertainty on LbolsolLumstat.error;stat.min;phys.luminositydoublenullableAgeAge, comma separate list of Ages (2)meta.note;time.agecharRefReferences, comma separated list (see refs.dat file)meta.refcharJ/ApJS/275/1/table3Summary of X-ray observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDCommon Name (spaces removed)meta.id;meta.maincharm_IDComponent name on IDmeta.code.multipcharHIP? Hipparcos Catalogue identifiermeta.idcharNxmm[1/38]? Number of XMM-Newton observationsmeta.number;obsintnullableTxmm[5/392]? Total XMM-Newton exposure timekstime;obs.exposurefloatnullableNchandra[1/6]? Number of Chandra observationsmeta.number;obsintnullableTchandra[4.9/97]? Total Chandra exposure timekstime;obs.exposurefloatnullableJ/ApJS/275/1/table4X-ray variability metricsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDCommon Name (spaces removed)meta.id;meta.maincharm_IDComponent name on IDmeta.code.multipcharHIP? Hipparcos Catalogue identifiermeta.idcharTelX-ray telescope usedmeta.id;instr.telcharObsID[616/891801301] X-ray observation identifiermeta.id;obs.param;obslongExpTime[0.8/68.4] Exposure timekstime.duration;obs.exposurefloatNet[70/831320] Net counts (1)ctphot.count;src.netinte_Net[10/1080] Uncertainty in Netctstat.error;phot.count;src.netintchi2[0.1/704] Chi^2^ of observed vs. constant count ratestat.fit.chi2floatA2[0.17/169] Anderson-Darling statisticstat.paramfloatJ/ApJS/275/1/table5All best-fit parameters from X-ray spectral modelingIDCommon Name (spaces removed)meta.id;meta.mainchare_kT3[0/0.8]? Lower error on kT3keVstat.error;stat.min;phys.temperaturefloatnullableE_norm3[0.04/164]? Upper error on norm3stat.error;stat.max;stat.fit.paramfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintm_IDComponent name on IDmeta.code.multipcharHIPHipparcos Catalogue identifiermeta.idcharObsID[7248/891801301] X-ray observation identifiermeta.id;obs.param;obslongDurSub-exposure duration (1)time.durationcharVarFlagVariability flag (2)meta.code;src.varcharkT1[0.05/1.8]? APEC Component #1, kTkeVphys.temperature;em.X-rayfloatnullableE_kT1[0.01/1.5]? Upper error on kT1keVstat.error;stat.max;phys.temperaturefloatnullablee_kT1[0.01/0.3]? Lower error on kT1keVstat.error;stat.min;phys.temperaturefloatnullablenorm1[0.2/562]? APEC Component #1, normalizationstat.fit.paramfloatnullableE_norm1[0.1/19700]? Upper error on norm1stat.error;stat.max;stat.fit.paramdoublenullablee_norm1[0.1/420]? Lower error on norm1stat.error;stat.minfloatnullablekT2[0.17/1.1]? APEC Component #2, kTkeVphys.temperature;em.X-rayfloatnullableE_kT2[0.01/0.5]? Upper error on kT2keVstat.error;stat.max;phys.temperaturefloatnullablee_kT2[0.01/0.4]? Lower error on kT2keVstat.error;stat.min;phys.temperaturefloatnullablenorm2[0.03/238]? APEC Component #2, normalizationstat.fit.paramfloatnullableE_norm2[0.02/83]? Upper error on norm2stat.error;stat.max;stat.fit.paramfloatnullablee_norm2[0.01/89]? Lower error on norm2stat.error;stat.minfloatnullablekT3[0.46/3.5]? APEC Component #3, kTkeVphys.temperature;em.X-rayfloatnullableE_kT3[0.02/63]? Upper error on kT3keVstat.error;stat.max;phys.temperaturefloatnullablenorm3[0.09/733]? APEC Component #3, normalizationstat.fit.paramfloatnullablee_norm3[0.01/65.5]? Lower error on norm3stat.error;stat.minfloatnullablelogLx[26/29.7] Log, X-ray luminosity, erg/slog(1e-07W)phys.luminosity;em.X-rayfloatE_logLx[0.01/0.2] Upper error on logLxlog(1e-07W)stat.error;stat.max;phys.luminosityfloate_logLx[0.01/0.3] Lower error on logLxlog(1e-07W)stat.error;stat.min;phys.luminosityfloatabd[0.02/1] Abundance (3)phys.abundfloatE_abd[0/0.6]? Upper error on abd (3)stat.error;stat.max;phys.abundfloatnullablee_abd[0.01/0.3]? Lower error on abd (3)stat.error;stat.min;phys.abundfloatnullablechi2[0.68/6.5] Average reduced chi^2stat.fit.chi2floatJ/ApJS/275/1/table6Average best-fit parameters from X-ray spectral modelingIDCommon Name (spaces removed)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintm_IDComponent name on IDmeta.code.multipcharHIP? Hipparcos Catalogue identifiermeta.idcharVarFlagVariability flag (1)meta.code;src.varcharSpTSpectral type flagsrc.spTypecharkT1[0.07/1.5]? APEC Component #1, kTkeVphys.temperature;em.X-rayfloatnullableE_kT1[0.01/0.3]? Upper error on kT1keVstat.error;stat.max;phys.temperaturefloatnullablee_kT1[0.01/0.3]? Lower error on kT1keVstat.error;stat.min;phys.temperaturefloatnullablenorm1[0.2/513]? APEC Component #1, normalizationstat.fit.paramfloatnullableE_norm1[0.1/228]? Upper error on norm1stat.error;stat.max;stat.fit.paramfloatnullablee_norm1[-0.8/228]? Lower error on norm1stat.error;stat.minfloatnullablekT2[0.19/1.1]? APEC Component #2, kTkeVphys.temperaturefloatnullableE_kT2[0.01/0.4]? Upper error on kT2keVstat.error;stat.max;phys.temperaturefloatnullablee_kT2[0.01/0.3]? Lower error on kT2keVstat.error;stat.min;phys.temperaturefloatnullablenorm2[0.03/139]? APEC Component #2, normalizationstat.fit.paramfloatnullableE_norm2[0.02/59]? Upper error on norm2stat.error;stat.max;stat.fit.paramfloatnullablee_norm2[0.01/59.3]? Lower error on norm2stat.error;stat.minfloatnullablekT3[0.6/3.5]? APEC Component #3, kTkeVphys.temperaturefloatnullableE_kT3[0.02/2.3]? Upper error on kT3keVstat.error;stat.max;phys.temperaturefloatnullablee_kT3[0.02/0.7]? Lower error on kT3keVstat.error;stat.min;phys.temperaturefloatnullablenorm3[0.09/171.3]? APEC Component #3, normalizationstat.fit.paramfloatnullableE_norm3[0.04/73]? Upper error on norm3stat.error;stat.max;stat.fit.paramfloatnullablee_norm3[0.03/77]? Lower error on norm3stat.error;stat.minfloatnullablelogLx[26/29.1] Log, X-ray luminosity, erg/slog(1e-07W)phys.luminosity;em.X-rayfloatE_logLx[0.01/0.4] Upper error on logLxlog(1e-07W)stat.error;stat.max;phys.luminosityfloate_logLx[0.01/0.8] Lower error on logLxlog(1e-07W)stat.error;stat.min;phys.luminosityfloatabd[0.03/1] Abundance (2)phys.abundfloatE_abd[0.02/0.7]? Upper error on abd (2)stat.error;stat.max;phys.abundfloatnullablee_abd[0.01/0.4]? Lower error on abd (2)stat.error;stat.min;phys.abundfloatnullablechi2[0.7/2.6] Average reduced chi^2stat.fit.chi2floatDist[1.3/18] Distancepcpos.distance;pos.heliocentricfloatJ/ApJS/275/1/table7X-ray luminosities and LX/Lbol ratios (or 3{sigma} upper limits)IDCommon Name (spaces removed)meta.id;meta.maincharm_IDComponent name on IDmeta.code.multipcharHIP? Hipparcos Catalogue identifiermeta.idcharlogL25[25.4/29]? Log, 25th percentile Lx, erg/slog(1e-07W)phys.luminosity;em.X-rayfloatnullablelogL25/Lbol[-8.01/-2.5]? Log, 25th percentile Lx/Lbolphys.luminosity;arith.ratio;em.X-rayfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlogL50[24/29] Log, 50th percentile Lx, erg/slog(1e-07W)phys.luminosity;em.X-rayfloatlogL75[26.2/29]? Log, 75th percentile Lx, erg/slog(1e-07W)phys.luminosity;em.X-rayfloatnullablelogL90[25.6/29.4]? Log, 90th percentile Lx, erg/slog(1e-07W)phys.luminosity;em.X-rayfloatnullablel_logL50/LbolLimit flag on logL50/Lbolmeta.code.error;phys.luminosity;arith.ratiocharlogL50/Lbol[-8/-2.37] Log, 50th percentile Lx/Lbolphys.luminosity;arith.ratio;em.X-rayfloatlogL75/Lbol[-7.5/-2.18]? Log, 75th percentile Lx/Lbolphys.luminosity;arith.ratio;em.X-rayfloatnullablelogL90/Lbol[-7.7/-1.99]? Log, 90th percentile Lx/Lbolphys.luminosity;arith.ratio;em.X-rayfloatnullableflag1? 25th percentile upper limit flag (1)meta.code.errorcharflag2? 50th percentile upper limit flag (1)meta.code.errorcharflag3? 75th percentile upper limit flag (1)meta.code.errorcharflag4? 90th percentile upper limit flag (1)meta.code.errorcharJ/ApJS/275/1/table8Potential HWO target stars with solar-Like Lx/Lbol ratiosIDStar Name (spaces removed)meta.id;meta.maincharAge[2.0/13.0]? AgeGyrtime.agefloatnullableSunSun Comparisonmeta.notecharTierHWO Tier (2)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintm_IDComponent name on IDmeta.code.multipcharHIP? Hipparcos Catalogue identifiermeta.idcharSpTSpectral Typesrc.spTypecharf_AgeFlag on Age (1)meta.code;time.agecharJ/ApJS/275/1/table9Summary of faint star observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar Name (spaces removed)meta.id;meta.maincharm_IDComponent name on IDmeta.code.multipcharHIP? Hipparcos Catalogue identifiermeta.idcharObsIDX-ray Observation ID (Telescope/ID)meta.id;obscharDetDetected?meta.codecharl_RateLimit flag on Ratemeta.code.errorcharRateCount Rate (1)count.s**-1arith.rate;phot.countchare_Rate? Uncertainty on Rate (1)count.s**-1stat.error;phot.countcharsigma[1.5/28.5]? Detection Significance, N*{sigma}stat.fit.goodnessfloatnullableMatchMatch Star (2)meta.id_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainSimbadNameSimbad column added by the CDSmeta.idcharnullableJ/ApJS/275/1/table10Stars with available Swift/XRT imagingIDStar Namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintm_IDComponent name on IDmeta.code.multipcharFlagFlag (1)meta.code.errorcharONameOther Namemeta.idcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainSpTSpectral Typesrc.spTypecharDist[3.29/21] Distancepcpos.distance;pos.heliocentricfloatMstar[0.2/1.4] MasssolMassphys.massfloatTeff[3344/6533] Surface effective temperatureKphys.temperature.effectiveintLbol[0.01/3] Bolometric luminositysolLumphys.luminosity;phot.flux.bolfloatl_logLxLimit flag on logLxmeta.code.error;phys.luminosity;em.X-raycharlogLx[26/28.3] Log, X-ray luminositylog(1e-07W)phys.luminosity;em.X-rayfloatJ/ApJS/275/1/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.noteintAuthFirst author's name(s)meta.bib.authorcharBibCodeBibcode of the referencemeta.bib.bibcodecharCommVizieR catalog's referencemeta.id;meta.datasetchar