J/AJ/162/235ivo://CDS.VizieR/J/AJ/162/235doi:10.26093/cds/vizier.51620235CDSYoungblood A.Roberge A.MacGregor M.A.Brandeker A.Weinberger A.J.,Perez S.Grady C.Welsh B.2022-03-14T07:38:34Z2022-03-04T07:04:25ZCDS support team

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

cds-question@unistra.fra-starsspectroscopyultraviolet-astronomychemical-abundancesWe present far- and near-ultraviolet absorption spectroscopy of the ~23Myr edge-on debris disk surrounding the A0V star {eta}Telescopii, obtained with the Hubble Space Telescope Space Telescope Imaging Spectrograph. We detect absorption lines from CI, CII, OI, MgII, AlII, SiII, SII, MnII, FeII, and marginally NI. The lines show two clear absorption components at -22.7{+/-}0.5km/s and -17.8{+/-}0.7km/s, which we attribute to circumstellar (CS) and interstellar gas, respectively. CO absorption is not detected, and we find no evidence for star-grazing exocomets. The CS absorption components are blueshifted by -16.9{+/-}2.6km/s in the star's reference frame, indicating that they are outflowing in a radiatively driven disk wind. We find that the C/Fe ratio in the {eta}Tel CS gas is significantly higher than the solar ratio, as is the case in the {beta}Pic and 49Cet debris disks. Unlike those disks, however, the measured C/O ratio in the {eta}Tel CS gas is consistent with the solar value. Our analysis shows that because {eta}Tel is an earlier type star than {beta}Pic and 49Cet, with more substantial radiation pressure at the dominant CII transitions, this species cannot bind the CS gas disk to the star as it does for {beta}Pic and 49Cet, resulting in the disk wind.2021AJ....162..235Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/162/235CatalogResearchIsServedByTAP VizieR generic servicerelated-toIII/254 : 2nd Cat. Radial Velocities with Astrometric Data (Kharchenko+, 2007)I/345 : Gaia DR2 (Gaia Collaboration, 2018)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/ApJ/497/330 : Candidate main-sequence stars (Mannings+, 1998)J/AN/328/889 : Mean Radial Velocities of open clusters (Kharchenko+, 2007)J/ApJ/660/1556 : Characterization of dusty debris disks (Rhee+, 2007)J/AJ/143/134 : Candidate members of {beta}Pic/ABDor groups (McCarthy+, 2012)J/PASP/125/477 : Gas Survey of Protoplanetary Systems. I. (Dent+, 2013)J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)J/ApJS/211/25 : Spitzer/IRS debris disk catalog. I. (Chen+, 2014)J/MNRAS/469/521 : CO, C & O gas content debris discs predictions (Kral+, 2017)J/A+A/614/A3 : 6 cold-gas-bearing debris-disc stars spectra (Rebollido+, 2018)J/ApJ/896/24 : Properties of atomic lines 51 Oph UV spectra (Jenkins+, 2020)J/A+A/639/A11 : Exocomets. A Spectroscopic Survey (Rebollido+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/162/235https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/162/235http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/162/235https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/162/235https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/162/235http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/162/235GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVdefaultJ/AJ/162/235/fig1Co-added spectrum of {eta}Telescopii from HST STIS E140H and E230H observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[1163/2835] Wavelength, Angstroms0.1nmem.wldoubleFluxFlux Density, erg/cm2/s/Ang10mW.m**-2.nm**-1phot.flux.densitydoublee_FluxFlux Density Error, erg/cm2/s/Ang10mW.m**-2.nm**-1stat.error;phot.fluxdouble