J/ApJ/886/19ivo://CDS.VizieR/J/ApJ/886/19doi:10.26093/cds/vizier.18860019CDSSchneider A.C.Shkolnik E.L.Barman T.S.Loyd R.P.2021-09-09T12:16:47Z2021-04-23T13:36:24ZCDS support team

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

cds-question@unistra.frk-starsspectroscopyultraviolet-astronomyThe discovery of habitable zone (HZ) planets around low-mass stars has highlighted the need for a comprehensive understanding of the radiation environments in which such planets reside. Of particular importance is knowledge of the far-ultraviolet (FUV) radiation, as low-mass stars are typically much more active than solar-type stars and the proximity of their HZs can be one-tenth the distance. The vast majority of the flux emitted by low-mass stars at FUV wavelengths occurs in the Ly{alpha} line at 1216 {AA}. However, measuring a low-mass star's Ly{alpha} emission directly is almost always impossible because of the contaminating effects of interstellar hydrogen and geocoronal airglow. We observed Ross825 (K3) and Ross1044 (M0), two stars with exceptional radial velocities, with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope. Their radial velocities resulted in significant line shifts, allowing for a more complete view of their Ly{alpha} line profiles. We provide an updated relation between effective temperature and Ly{alpha} flux using Gaia DR2 astrometry as well as updated, model-independent relationships between Ly{alpha} flux and UV flux measurements from the Galaxy Evolution Explorer (GALEX) for low-mass stars. These new relations, in combination with GALEX's considerable spatial coverage, provide substantial predictive power for the Ly{alpha} environments for thousands of nearby, low-mass stars.2019ApJ...886...19Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/886/19CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)III/119 : Spectral classifications of proper motion stars (Bidelman+ 1985)III/198 : Palomar/MSU nearby star spectroscopic survey (Hawley+ 1997)III/221 : Catalogue of [Fe/H] of F, G, K stars (Cayrel de Strobel+, 2001)I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/A+A/331/81 : Hyades membership (Perryman+ 1998)J/AJ/121/2148 : Precise spectral types for 372 A, F & G stars (Gray+, 2001)J/AJ/126/2048 : NStars project: the Northern Sample. I. (Gray+, 2003)J/other/ARA+A/42.685 : Young stars near the Sun (Zuckerman+, 2004)J/ApJS/159/141 : Spectroscopic properties of cool stars. I. (Valenti+, 2005)J/AJ/132/161 : NStars project: The southern sample. I. (Gray+, 2006)J/A+A/445/939 : Metal-poor stars uvby-beta photometry. XI. (Schuster+, 2006)J/A+A/460/695 : Associations Containing Young stars (Torres+, 2006)J/ApJ/705/1226 : Planet-bearing stars in Spitzer (Bryden+, 2009)J/ApJ/699/649 : Young M dwarfs within 25pc. I. (Shkolnik+, 2009)J/A+A/530/A138 : Geneva-Copenhagen survey re-analysis (Casagrande+, 2011)J/A+A/534/A58 : HD20794, HD85512, HD192310 HARPS RVs (Pepe+, 2011)J/ApJ/761/166 : Terrestrial exoplanet atmospheres. I. (Hu+, 2012)J/ApJ/756/46 : Lithium abundances in HIP stars (Ramirez+, 2012)J/ApJ/748/93 : K-band spectra for 133 nearby M dwarfs (Rojas-Ayala+, 2012)J/ApJ/758/56 : Young M dwarfs within 25pc. II. Kinematics (Shkolnik+, 2012)J/A+A/556/A126 : GJ667C Doppler & activity data (Anglada-Escude+, 2013)J/ApJ/771/40 : Main-sequence A, F, G & K stars photometry (Boyajian+, 2013)J/A+A/555/A11 : DUNES survey observational results (Eiroa+, 2013)J/A+A/551/L8 : Chromospheric activity of field stars (Pace, 2013)J/ApJS/208/9 : Intrinsic colors & temperatures of PMS stars (Pecaut+, 2013)J/ApJ/764/78 : Oxygen abundances in nearby FGK stars (Ramirez+, 2013)J/ApJ/784/156 : Parallaxes for nearby mid-to-late M dwarfs (Dittmann+, 2014)J/MNRAS/443/2561 : CONCH-SHELL catalog of nearby M dwarfs (Gaidos+, 2014)J/ApJS/211/9 : Variability in UV line emission of F-M stars (Loyd+, 2014)J/AJ/147/20 : Spectroscopy of 447 nearby M dwarfs (Newton+, 2014)J/ApJ/798/41 : GALEX NUV obs. of bright M-type stars (Ansdell+, 2015)J/MNRAS/454/593 : Young moving groups in solar neighbourhood (Bell+, 2015)J/ApJ/807/45 : Potentially habitable planets (Dressing+, 2015)J/ApJ/804/64 : Empirical and model parameters of 183 M dwarfs (Mann+, 2015)J/ApJ/800/85 : Teff, radii and luminosities of cool dwarfs (Newton+, 2015)J/MNRAS/452/2127 : Fundamental param. of Kepler stars (Silva Aguirre+, 2015)J/A+A/585/A5 : Exoplanet hosts/field star ages (Bonfanti+, 2016)J/ApJS/225/32 : Extended abundance analysis of cool stars (Brewer+, 2016)J/AJ/151/160 : 1103 parallaxes and proper motions from URAT (Finch+, 2016)J/ApJS/224/2 : K2 EPIC stellar properties for 138600 targets (Huber+, 2016)J/ApJ/817/1 : Palomar/MSU and SDSS-DR7 M dwarfs with GALEX (Jones+, 2016)J/ApJ/834/17 : Mass & rad of planets, moons, low mass stars (Chen+, 2017)J/AJ/153/128 : WOCS. LXXV. Hyades & Praesepe (Cummings+, 2017)J/AJ/153/21 : Abundances in the local region. II. (Luck+, 2017)J/AJ/154/245 : Spitzer-detected debris disks (Meshkat+, 2017)J/ApJ/836/77 : High-S/N opt. spectra library of FGKM stars (Yee+, 2017)J/ApJ/843/31 : MUSCLES Treasury Survey. IV. (Youngblood+, 2017)J/A+A/614/A55 : Li abundance in dwarfs & subgiants (Aguilera-Gomez+, 2018)J/AJ/155/149 : Co-moving stars observed by Gaia (Bochanski+, 2018)J/AJ/155/180 : Cool dwarf targets for the TESS (Muirhead+, 2018)J/AJ/156/102 : TESS Input Catalog & Candidate Target List (Stassun+, 2018)J/AJ/158/75 : M dwarfs planet occurrence rates (Hardegree-Ullman+, 2019)J/ApJ/872/17 : HAZMAT. V. (Richey-Yowell+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/886/19https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/886/19http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/886/19https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/886/19https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/886/19http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/886/19GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/886/19/table2 (HST/STIS observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/886/19/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/886/19/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/886/19/table2?GETtext/xml+votable180.050000true317.821065833.52424720.0055555555555555566/8205 13264https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/886/19?format=asciiUVdefaultJ/ApJ/886/19/table2HST/STIS observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharprimaryDate1First date of observation (UT)time.epoch;obsnullableDate2Second date of observation (UT)time.epoch;obsnullableExp[15186/17079] Exposure timestime.duration;obs.exposureintSpInteractive spectrum plotmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_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/886/19/fig1HST/STIS spectra for Ross 1044 and Ross 825recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharprimarylambda[1194.4/1249.1] Wavelength; in {AA} units0.1nmmeta.unit;em.wldoubleFlux[-0.81/3.3] Observed flux; in erg/s/cm^2^/{AA} unitscW.m**-2.nm**-1meta.unitdoublee_Flux[1.7e-6/0.3] Uncertainty in Flux; in erg/s/cm^2^/{AA} unitscW.m**-2.nm**-1stat.error;phot.fluxdouble