J/AJ/167/268ivo://CDS.VizieR/J/AJ/167/268doi:10.26093/cds/vizier.51670268CDSSneden C.Preston G.W.2024-11-06T20:20:17Z2024-06-28T07:53:45ZCDS support team

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

cds-question@unistra.frvariable-starsspectroscopyvisible-astronomyWe have investigated the absorption shapes of atomic lines and H{alpha} in RR-Lyrae stars. We used the database of high-resolution spectra gathered with the Las Campanas Observatory du Pont Telescope, analyzing a set of about 2700 short exposure spectra of 17 RRab and 5 RRc variables. To increase the signal-to-noise ratio of the spectra for each star, we first coadded spectra in small photometric phase bins, and then coadded metallic line profiles in velocity space. The resulting line absorption shapes vary with photometric phase in a consistent manner for all RRab stars, while exhibiting no obvious phase-related variations for the RRc stars. We interpret these line profile variations in terms of velocity gradients in the photospheric layers that produce absorption line profiles. The H{alpha} profiles are much broader, indicative of shock temperatures of order 100000K.2024AJ....167..268Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/167/268CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/194/38 : Radial velocities of 11 field RR Lyrae (For+, 2011)J/ApJS/197/29 : Chemical compositions of 11 RR Lyrae (For+, 2011)J/ApJ/782/59 : Abundances 8 RR Lyrae subclass C variable stars (Govea+, 2014)J/ApJ/848/68 : Abundances & RVs of stable & Blazhko RRc stars (Sneden+, 2017)J/AJ/155/45 : Metal-rich RRc stars in Carnegie RRLyrae Survey (Sneden+, 2018)J/AJ/157/153 : Atomic lines in spectra of RRLyrae & RHB stars (Preston+, 2019)J/ApJ/919/85 : Field RR Lyrae as Gal. probes. V. RVC templates (Braga+, 2021)J/ApJ/919/85 : Field RR Lyrae as Gal. probes. V. RVC templates (Braga+, 2021)J/ApJ/908/20 : On use field RR Lyrae as galactic probes. II. (Crestani+, 2021)J/ApJ/914/10 : Field RRLyrae as Gal. probes. III. Abundances (Crestani+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/167/268https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/167/268http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/167/268https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/167/268https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/167/268http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/167/268GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/167/268/table2 (Observed line broadening parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/167/268/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/167/268/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/167/268/table2?GETtext/xml+votable180.050000true154.0206092-29.72844940.0055555555555555566/110 12743 18177 19110 25199 26281 26981 27824 31743 33465 34537 35151 38456 38809 39152 40475 40952 40998 41022 46069 46482 48916https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/167/268?format=asciiOpticaldefaultJ/AJ/167/268/table2Observed line broadening parametersSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharPhase[0.004/1] Pulsational phasetime.phasefloatLines[7/78] Number of absorption lines in mean profilemeta.numberintVB50[-18.6/-4.0] Blue velocity width at 0.50 of continuumkm/sspect.line.width;spect.dopplerVelocfloatVR50[4.2/28.2] Red velocity width at 0.50 of continuumkm/sspect.line.width;spect.dopplerVelocfloatVB85[-34.0/-9.2] Blue velocity width at 0.85 of continuumkm/sspect.line.width;spect.dopplerVelocfloatVR85[9.4/55.0] Red velocity width at 0.85 of continuumkm/sspect.line.width;spect.dopplerVelocfloatmu50[-0.51/0.91] Skew at 0.50 of continuumstat.fit.paramfloatmu85[-0.36/1.51] Skew at 0.85 of continuumstat.fit.paramfloat_RAPosition from simbad (right ascension part)degpos.eq.ra;meta.main_DEPosition from simbad (declination part)degpos.eq.dec;meta.main