J/A+A/591/A20ivo://CDS.VizieR/J/A+A/591/A20doi:10.26093/cds/vizier.35910020CDSKohl S.Czesla S.Schmitt J.H.M.M.2017-12-22T05:33:07Z2016-06-06T07:28:08ZCDS support team

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

cds-question@unistra.frinterstellar-mediumspectroscopyDiffuse interstellar absorption bands (DIBs) of largely unknown chemical origin are regularly observed primarily in distant early-type stars. More recently, detections in nearby late-type stars have also been claimed. These stars' spectra are dominated by stellar absorption lines. Specifically, strong interstellar atomic and DIB absorption has been reported in tau Boo. We test these claims by studying the strength of interstellar absorption in high-resolution TIGRE spectra of the nearby stars tau Boo, HD 33608, and alpha CrB. We focus our analysis on a strong DIB located at 5780.61{AA} and on the absorption of interstellar Na. First, we carry out a differential analysis by comparing the spectra of the highly similar F-stars, tau Boo and HD 33608, whose light, however, samples different lines of sight. To obtain absolute values for the DIB absorption, we compare the observed spectra of tau Boo, HD 33608, and alpha CrB to PHOENIX models and carry out basic spectral modeling based on Voigt line profiles.2016A&A...591A..20Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/591/A20CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/591/A20https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/591/A20http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/591/A20https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/591/A20https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/591/A20http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/591/A20GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/591/A20/list (List of spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/591/A20/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/591/A20/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/591/A20/list?GETtext/xml+votable180.050000true206.815583317.45691670.0055555555555555566/8687 8843 22841https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/591/A20?format=asciiOpticaldefaultJ/A+A/591/A20/listList of spectraspNaDShow the NaD spectrummeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainbwaveDIBLower value of wavelength interval for DIB spectrum0.1nmem.wlintBwaveDIBUpper value of wavelength interval for DIB spectrum0.1nmem.wlintdwaveDIBSpectral resolution for DIB spectrum0.1nmspect.resolutionfloatNxDIBNumber of pixels along X-axis for DIB spectrummeta.numberintspDIBShow the DIB spectrummeta.ref.urlcharFileDIBName of DIB fits spectrum, in subdirectory spmeta.id;meta.fitscharbwaveNaDLower value of wavelength interval for NaD spectrum0.1nmem.wlintBwaveNaDUpper value of wavelength interval for NaD spectrum0.1nmem.wlintdwaveNaDSpectral resolution for NaD spectrum0.1nmspect.resolutionfloatNxNaDNumber of pixels along X-axis for NaD spectrummeta.numberintFileNaDName of NaD fits spectrum, in subdirectory spmeta.id;meta.fitscharSimbadSimbad column added by the CDSmeta.ref.urlchar