J/ApJ/896/24ivo://CDS.VizieR/J/ApJ/896/24doi:10.26093/cds/vizier.18960024CDSJenkins E.B.Gry C.2022-03-07T13:24:57Z2021-11-04T15:00:51ZCDS support team

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

cds-question@unistra.frspectroscopyultraviolet-astronomyvisible-astronomyatomic-physicsbe-starsWe measured 304 absorption features in the ultraviolet and visible spectra of the star 51 Oph, which is known to have a debris disk with a high inclination. We analyzed the relative populations of atoms in excited fine-structure and metastable levels that are maintained by optical pumping and collisional excitation by electrons, and we found that most of the gas is situated at about 6 au from the star, has an electron volume density 10^5^<n(e)<3x10^6^cm^-3^, and a temperature T=8000K. Our interpretations reveal that the gas is partly ionized, has a column density of neutral hydrogen equal to 10^21^cm^-2^, and has a composition similar to that of a mildly depleted interstellar medium or that of Jupiter-family comets. Compared to results for disks around some other stars, such as {beta} Pic and 49 Cet, we find surprisingly little neutral carbon. No molecular features were detected, which indicates that our line of sight misses the molecule-rich central plane of the disk. The tilt of the disk is also validated by our being able to detect resonant scattering of the starlight by oxygen atoms.2020ApJ...896...24Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/896/24CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+AS/109/125 : Photoionisation cross section (Verner+, 1995)J/A+AS/118/481 : ROSAT all-sky survey catalogue of OB stars (Berghoefer+ 1996)J/A+A/385/716 : N-like and O-like Breit-Pauli energy levels (Tachiev+, 2002)J/ApJS/167/334 : Radiative recombination data for plasmas (Badnell+, 2006)J/ApJ/653/657 : Spectroscopic obs. of Herbig Ae/Be stars (Manoj+, 2006)J/ApJS/163/207 : Oscillator and collision strengths in NI (Tayal+, 2006)J/A+A/475/677 : X-ray emission from A-type stars (Schroeder+, 2007)J/ApJS/176/59 : FUSE survey of OVI in the disk of the Milky Way (Bowen+, 2008)J/ApJ/700/1299 : Gas-phase element depletions in the ISM (Jenkins, 2009)J/A+A/513/A55 : Effective collision strengths of Ni II (Cassidy+, 2010)J/ApJS/194/35 : Atomic transition probabilities of Mn (Den Hartog+, 2011)J/PASP/125/477 : Gas Survey of Protoplanetary Systems. I. (Dent+, 2013)J/ApJ/764/25 : FUSE spectra analysis of hot subdwarf stars (Jenkins, 2013)J/ApJ/804/76 : ZnII lines and collision strengths (Kisielius+, 2015)J/A+A/607/A25 : beta Pic HARPS spectrum (Vidal-Madjar+, 2017)J/A+A/625/A78 : Carbon and nitrogen rate coefficients (Amarsi+, 2019)J/AJ/157/159 : Stellar parameters for 131 Herbig Ae/Be stars (Arun+, 2019)J/A+A/625/L13 : TESS light curve of beta Pictoris (Zieba+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/896/24https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/896/24http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/896/24https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/896/24https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/896/24http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/896/24GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVOpticaldefaultJ/ApJ/896/24/tablea1Properties of atomic linesSpSpeciesphys.atmol.ionStagecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[1071/5897.6] Laboratory wavelength0.1nmem.wldoublef_lambda[b-q] Notes on specific transitions (1)meta.codecharE[0/36252] Excitationcm**-1phys.atmol.excitationintf[4.7e-08/1.8] Transition f-valuephys.atmol.transProb;phys.atmol.transitiondoublel_e_fLimit flag on e_fmeta.code.errorchare_f[0.003/0.3]? log of f-value relative uncertaintystat.errorfloatnullabler_fReference(s) for f-value (2)meta.ref;pos.framechar