Active giant binaries from VSX and Gaia EDR3 J/ApJ/927/222 ivo://CDS.VizieR/J/ApJ/927/222 doi:10.26093/cds/vizier.19270222 CDS Leiner E.M. Geller A.M. Gully-Santiago M.A. Gosnell N.M.,Tofflemire B.M. 2024-11-06T20:24:01Z 2024-02-27T09:43:56Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr giant-stars variable-stars stellar-distance two-color-diagrams visible-astronomy Sub-subgiant stars (SSGs) fall below the subgiant branch and/or red of the giant branch in open and globular clusters, an area of the color-magnitude diagram (CMD) not populated by standard stellar evolution tracks. One hypothesis is that SSGs result from rapid rotation in subgiants or giants due to tidal synchronization in a close binary. The strong magnetic fields generated inhibit convection, which in turn produces large starspots, radius inflation, and lower-than-expected average surface temperatures and luminosities. Here we cross-reference a catalog of active giant binaries (RS CVns) in the field with Gaia EDR3. Using the Gaia photometry and parallaxes, we precisely position the RS CVns in a CMD. We identify stars that fall below a 14Gyr, metal-rich isochrone as candidate field SSGs. Out of a sample of 1723 RS CVn, we find 448 SSG candidates, a dramatic expansion from the 65 SSGs previously known. Most SSGs have rotation periods of 2-20 days, with the highest SSG fraction found among RS CVn with the shortest periods. The ubiquity of SSGs among this population indicates that SSGs are a normal phase in evolution for RS CVn-type systems, not rare by-products of dynamical encounters found only in dense star clusters as some have suggested. We present our catalog of 1723 active giants, including Gaia photometry and astrometry, and rotation periods from the Transiting Exoplanet Survey Satellite and International Variable Star Index (VSX). This catalog can serve as an important sample to study the impacts of magnetic fields in evolved stars. 2022ApJ...927..222L https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/927/222 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-) II/287 : Northern Sky Variability Survey (NSVS) (Wozniak+, 2004) II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005) IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019) I/350 : Gaia EDR3 (Gaia Collaboration, 2020) I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021) I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022) J/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997) J/ApJ/640/1018 : Differential photometry of V1061 Cyg (Torres+, 2006) J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009) J/ApJS/211/2 : Revised properties of Q1-16 Kepler targets (Huber+, 2014) J/AJ/154/250 : Kepler EB classif. and rotation periods (Lurie+, 2017) J/MNRAS/483/1125 : Inflation in Praesepe active M-dwarfs (Jackson+, 2019) J/AJ/160/12 : J, Ks, NUV emission of 133 red giant stars (Dixon+, 2020) J/A+A/634/A1 : NGC 1068 GRAVITY reconstructed image (GRAVITY+, 2020) J/AJ/161/190 : Radial Velocities of binary pop. in M67 (Geller+, 2021) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/927/222 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/927/222 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/927/222 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/927/222 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/927/222 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/927/222 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJ/927/222/table1 (RS CVn sample) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/927/222/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/927/222/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/927/222/table1? 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J/ApJ/927/222/table1 RS CVn sample recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Gaia Gaia EDR3 source identifier meta.id;meta.main VSX Identifier in the VSX catalog meta.id.cross char TIC [854203/953395322]? TESS Input Catalog identifier meta.id.cross long nullable RAJ2000 Gaia EDR3 Right Ascension (J2000) deg pos.eq.ra;meta.main DEJ2000 Gaia EDR3 Declination (J2000) deg pos.eq.dec;meta.main Dist [29/2000] Gaia EDR3 distance pc pos.distance;pos.heliocentric int Gmag [3.16/16.37] Gaia EDR3 G band magnitude mag phot.mag;em.opt float BP-RP [0.6/2.51] Gaia EDR3 Blue-Red passband color mag phot.color;em.opt.B;em.opt.R float RUWE [0.79/37.3] Gaia EDR3 Renormalized Unit Weight Error stat.error float chi2 [116.9/598982] Gaia EDR3 astrometric goodness of fit stat.fit.goodness double NAL [131/1231] Number of good Gaia EDR3 observations meta.number int PVSX [0.13/96] VSX catalog period d time.period float PTess [0.13/279]? TESS period d time.period float nullable Amp [0/5]? TESS amplitude src.var.amplitude float nullable Nsec [0/23] Number of TESS sectors meta.number int Av [0.02/0.5] Line-of-sight V band extinction mag phys.absorption;em.opt.V float Class Classification (1) src.class char