J/AJ/165/245ivo://CDS.VizieR/J/AJ/165/245doi:10.26093/cds/vizier.51650245CDSNagarajan N.Sneden C.Afsar M.Pilachowski C.A.2024-11-22T20:08:37Z2024-01-26T08:45:37ZCDS support team

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

cds-question@unistra.fropen-star-clustersgiant-starsvisible-astronomyspectroscopychemical-abundancesWe have gathered optical-region spectra, derived model atmosphere parameters, and computed elemental abundances for 15 red giant stars in the open cluster NGC7789. We focus on the light element group CNOLi that provides clues to evolutionary changes associated with internal fusion events and chemical mixing. We confirm and extend an early report that NGC7789 stars 193 and 301 have anomalously large Li abundances, and that these values are apparently unconnected to any other elements' abundances in these stars. A companion study of HeI{lambda}10830 lines in both field stars and cluster members shows that star 301 has a strong He feature while star 193 does not. Possible explanations for the large Li abundances of these stars include helium flash-induced mixing events and binary interactions at some past or present times. In either case an internal eruption of energy could cause fresh synthesis of lithium via the Cameron-Fowler Berillyum transport mechanism. Rapid transport of lithium to the outer layers may have created significant chromospheric transient disturbances, producing enough helium ionization to allow for the strong {lambda}10830 absorption in star 301.2023AJ....165..245Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/165/245CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)J/PASP/110/1318 : NGC 7789 CCD VI photometry (Gim+, 1998)J/AN/321/277 : Effective temperatures of K-M giants (Strassmeier+, 2000)J/A+A/431/933 : Abundances of NGC 7789 evolved stars (Tautvaisiene+, 2005)J/AN/328/938 : Teff/line-depth ratio for ELODIE spectra (Biazzo+, 2007)J/A+A/523/A48 : Gaia photometry (Jordi+, 2010)J/A+A/511/A56 : Abundances of five open clusters (Pancino+, 2010)J/AJ/142/59 : Chemical abundance in 10 open clusters (Jacobson+, 2011)J/MNRAS/446/3562 : Abundances of red giants in NGC752 (Bocek Topcu+, 2015)J/AJ/149/15 : Spectroscopy of NGC 7789 (Overbeek+, 2015)J/MNRAS/463/580 : Abundances of red giants in NGC6940 (Bocek+, 2016)J/A+A/618/A93 : Gaia DR2 open clusters in Milky Way (Cantat-Gaudin+, 2018)J/MNRAS/484/2000 : Study of Lithium-rich giants with GALAH (Deepak+, 2019)J/ApJ/879/105 : Effective temp of low-mass stars (Lopez-Valdivia+, 2019)J/A+A/655/A23 : Open cluster red clump stars Lit abundances (Magrini+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/165/245https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/165/245http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/165/245https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/165/245https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/165/245http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/165/245GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/165/245/table2 (Basic data for target stars adopted from SIMBAD)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/165/245/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/165/245/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/165/245/table2?GETtext/xml+votable180.050000true359.074309256.66880970.0055555555555555560/1.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/165/245?format=asciiOpticaldefaultJ/AJ/165/245/table2Basic data for target stars adopted from SIMBADVmag[10.74/13.05] SIMBAD V magnitudemagphot.mag;em.opt.VfloatB-V[1.14/1.9]? SIMBAD B-V color indexmagphot.color;em.opt.B;em.opt.VfloatnullableEWsDisplay the equivalent width measurements for this starmeta.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.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintName[72/1101] Star identifier from Kustner, 1923VeBon..18....1K (<NGC 7789 NNNN> in Simbad)meta.id;meta.mainintf_Name[a] a: note on Star 193 (1)meta.codecharplx[0.4/0.7] Parallaxmaspos.parallax.trigfloatpmRA[-1.13/8.5] Proper motion in RAmaspos.pm;pos.eq.rafloatpmDE[-2.45/-1.7] Proper motion in DECmaspos.pm;pos.eq.decfloatGmag[9.86/12.65] Gaia G band magnitudemagphot.mag;em.optfloatBP-RP[1.48/2.22]? Gaia BP-RP color indexmagphot.color;em.opt.B;em.opt.RfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/AJ/165/245/table3Equivalent WidthsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpeciesAtomic species identifiermeta.id.part;phys.atmol.configurationcharWave[4545/7836] Wavelength; Angstroms0.1nmem.wlfloatchi[0.24/6.19] Excitation energyeVphys.atmol.excitationfloatloggf[-4.61/0.55] log transition probabilityphys.atmol.oscStrengthfloatEW-72[22/299]? Star 72 equivalent width1e-13mspect.line.eqWidthintnullableEW-193[28/321]? Star 193 equivalent width1e-13mspect.line.eqWidthintnullableEW-301[24/275]? Star 301 equivalent width1e-13mspect.line.eqWidthintnullableEW-329[27/266]? Star 329 equivalent width1e-13mspect.line.eqWidthintnullableEW-353[23/261]? Star 353 equivalent width1e-13mspect.line.eqWidthintnullableEW-461[22/299]? Star 461 equivalent width1e-13mspect.line.eqWidthintnullableEW-468[29/290]? Star 468 equivalent width1e-13mspect.line.eqWidthintnullableEW-494[19/327]? Star 494 equivalent width1e-13mspect.line.eqWidthintnullableEW-501[15/275]? Star 501 equivalent width1e-13mspect.line.eqWidthintnullableEW-637[28/236]? Star 637 equivalent width1e-13mspect.line.eqWidthintnullableEW-669[26/285]? Star 699 equivalent width1e-13mspect.line.eqWidthintnullableEW-765[26/243]? Star 765 equivalent width1e-13mspect.line.eqWidthintnullableEW-970[24/272]? Star 970 equivalent width1e-13mspect.line.eqWidthintnullableEW-1066[25/279]? Star 1066 equivalent width1e-13mspect.line.eqWidthintnullableEW-1101[16/209]? Star 1101 equivalent width1e-13mspect.line.eqWidthintnullable