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The ASAS-SN catalogue of variable stars IX: The spectroscopic properties of Galactic variable stars

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cris.lastimport.scopus2024-02-12T20:51:14Z
dc.abstract.enThe All-Sky Automated Survey for Supernovae provides long baseline (∼4 yr) V-band light curves for sources brighter than V≲ 17 mag across the whole sky. We produced V-band light curves for a total of ∼61.5 million sources and systematically searched these sources for variability. We identified ∼426 000 variables, including ∼219 000 new discoveries. Most (~74%) of our discoveries are in the Southern hemisphere. Here, we use spectroscopic information from LAMOST, GALAH, RAVE, and APOGEE to study the physical and chemical properties of these variables. We find that metal-poor eclipsing binaries have orbital periods that are shorter than metal-rich systems at fixed temperature. We identified rotational variables on the main-sequence, red giant branch, and the red clump. A substantial fraction (~80%) of the rotating giants have large v <SUB>rot</SUB> or large near-ultraviolet excesses also indicative of fast rotation. The rotational variables have unusual abundances suggestive of analysis problems. Semiregular variables tend to be lower metallicity ([Fe/H]~-0.5) than most giant stars. We find that the APOGEE DR16 temperatures of oxygen-rich semiregular variables are strongly correlated with the W<SUB>RP</SUB> - W<SUB>JK</SUB> colour index for T_{eff}<=3800 K. Using abundance measurements from APOGEE DR16, we find evidence for Mg and N enrichment in the semiregular variables. We find that the Aluminum abundances of the semiregular variables are strongly correlated with the pulsation period, where the variables with P~60 d are significantly depleted in Al.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorJayasinghe, T.
dc.contributor.authorKochanek, C. S.
dc.contributor.authorStanek, K. Z.
dc.contributor.authorShappee, B. J.
dc.contributor.authorHoloien, T. W. -S.
dc.contributor.authorThompson, Todd A.
dc.contributor.authorPrieto, J. L.
dc.contributor.authorDong, Subo
dc.contributor.authorPawlak, Michał
dc.contributor.authorPejcha, O.
dc.contributor.authorPojmański, Grzegorz
dc.contributor.authorOtero, S.
dc.contributor.authorHurst, N.
dc.contributor.authorWill, D.
dc.date.accessioned2024-01-26T09:54:53Z
dc.date.available2024-01-26T09:54:53Z
dc.date.copyright2020-07-17
dc.date.issued2021
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number1
dc.description.versionORIGINAL_AUTHOR
dc.description.volume503
dc.identifier.doi10.1093/MNRAS/STAB114
dc.identifier.issn0035-8711
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/121895
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2021MNRAS.503..200J
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.relation.pages200-235
dc.rightsOther
dc.sciencecloudnosend
dc.titleThe ASAS-SN catalogue of variable stars IX: The spectroscopic properties of Galactic variable stars
dc.typeJournalArticle
dspace.entity.typePublication