J/ApJ/954/123ivo://CDS.VizieR/J/ApJ/954/123doi:10.26093/cds/vizier/ba-xt-3vCDSPradhan P.Huenemoerder D.P.Ignace R.Nichols J.S.Pollock A.M.T.2026-07-02T12:00:25Z2025-12-08T09:41:41ZCDS support team

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

cds-question@unistra.frx-ray-sourceswolf-rayet-starso-starsmultiple-starsspectroscopyIdentifying trends between observational data and the range of physical parameters of massive stars is a critical step to the still-elusive full understanding of the source, structure, and evolution of X-ray emission from the stellar winds, requiring a substantial sample size and systematic analysis methods. As of 2022, the Chandra data archive contains 37 high-resolution spectra of O, B, and WR stars, observed with the Chandra/HETGS, and of sufficient quality to fit the continua and emission-line profiles. Using a systematic approach to the data analysis, we explore morphological trends in the line profiles (i.e., O, Ne, Mg, and Si) and find that the centroid offsets of resolved lines versus wavelength can be separated in three empirically defined groups based on the amount of line broadening and centroid offset. Using Fe XVII (15.01, 17.05{AA}) and Ne X{alpha} (12.13{AA}) lines, which are prevalent among the sample stars, we find a well-correlated linear trend of increasing Full Width Half Maximum with faster wind terminal velocity. The H-like/He-like total line flux ratio for strong lines displays different trends with spectral class depending on ion species. Some of the sources in our sample have peculiar properties (e.g., magnetic and {gamma} Cas-analog stars) and we find that these sources stand out as outliers from more regular trends. Finally, our spectral analysis is presented summarily in terms of X-ray spectral energy distributions in specific luminosity for each source, including tables of line identifications and fluxes.2023ApJ...954..123Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/954/123CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2014)III/23 : MK Classification for OB Stars (Lesh 1968)I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)III/274 : Galactic O-Star Spectroscopic Survey (GOSSS) (Sota+, 2014)I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)J/ApJS/93/211 : IUE survey of H I Ly{alpha} absorption. I. (Diplas+ 1994)J/ApJS/169/353 : Chandra sources in M17 (Broos+, 2007)J/AJ/138/33 : VLT JHKs imaging of RCW 38 (Derose+, 2009)J/A+A/501/297 : Effective temperatures of B Supergiants (Zorec+, 2009)J/AJ/141/129 : Chandra Transmission Grating Data Cat. (Huenemoerder+, 2011)J/other/Sci/337.444 : RV curves of Galactic massive O stars (Sana+, 2012)J/ApJS/224/4 : GOSSS III. Additional O-type systems (Maiz Apellaniz+, 2016)J/A+A/594/A82 : XMM sources in IC 1805 (Rauw+, 2016)J/AJ/152/213 : Interferometry & sp. of sigma Orionis (Schaefer+, 2016)J/MNRAS/456/2 : MiMeS survey of magnetism in massive stars (Wade+, 2016)J/A+A/619/A148 : Hot stars observed by XMM-Newton. II. (Naze+, 2018)J/A+A/620/A89 : X-ray catalog of Galactic O stars (Nebot Gomez-Moran+, 2018)J/A+A/626/A20 : MONOS. I. Spectral classifications (Maiz Apellaniz+, 2019)J/A+A/643/A138 : Possible runaway stars list (Maiz Apellaniz+, 2020)J/MNRAS/493/1512 : Galactic Wolf-Rayet stars with Gaia DR2 I (Rate+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/954/123https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/954/123http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/954/123https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/954/123https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/954/123http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/954/123GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/954/123/table1 (The list of sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/954/123/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/954/123/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/954/123/table1?GETtext/xml+votable180.050000true270.9685208-24.36073110.0055555555555555566/1558 3030 14631 14692 15478 20510 20764 21401 21438-21439 22253 22854 22862 22884 23637 28890 29116 30818 37231 37872 38016 39216 39327 39907 42213-42214 42948 43024 43035https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/954/123?format=asciiX-raydefaultJ/ApJ/954/123/table1The list of sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/37] Running sequence numbermeta.idintNameName of the sourcemeta.id;meta.maincharprimaryFlux[0.1/17.65] Observed flux in 10^11^erg/cm^2^/s units1e-17W.m**-2phot.flux;em.X-rayfloatCRate[8.05/3000] Count ratect/ksphot.count;em.X-rayfloatExp[50/2035] Exposure timekstime.duration;obs.exposureintErr[0.1/2.5] Percentage uncertainty%stat.errorfloatNobs[1/68] Number of observationsmeta.numberintNabNumber of abundance measurements for this star (link to Table 5)meta.numberintnullableObsIDList of observation identifier(s) used in this workmeta.id;instr.setup;obscharSimbadNameSimbad column added by the CDSmeta.idcharnullable_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.mainJ/ApJ/954/123/table5Line measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStellar identifiermeta.id;meta.maincharIonIon identifierphys.atmol.ionStagecharWave0[1.78/24.8] Theoretical line wavelength; Angstroms0.1nmem.wlfloatDeltav[-1577/1427]? Measured line wavelength offset from Wave0 (1)km/sspect.line.widthintnullablee_Deltav[4/523]? Uncertainty in Deltav (1)km/sstat.error;spect.line.widthintnullableFWHM[69/3953]? Line Full-Width at Half-Maximum (1)km/sspect.line.widthintnullablee_FWHM[11/1144]? Uncertainty in FWHM (1)km/sstat.error;spect.line.widthintnullableFx[0.02/101] Observed X-ray flux (1)100000ph.cm**-2.s**-1phot.flux;em.X-rayfloate_Fx[0/7] Uncertainty in Fx (1)100000ph.cm**-2.s**-1stat.error;phot.flux;em.X-rayfloatF0[0.03/176] X-ray flux corrected for interstellar absorption (1)100000ph.cm**-2.s**-1phot.flux;arith.diff;em.X-rayfloate_F0[0/92]? Uncertainty in F0 (1)100000ph.cm**-2.s**-1stat.error;phot.flux;em.X-rayfloatnullable