Bayesian Ages For Field LowEr-mass Stars J/ApJ/898/27 ivo://CDS.VizieR/J/ApJ/898/27 doi:10.26093/cds/vizier.18980027 CDS Stanford-Moore S.A. Nielsen E.L. De Rosa R.J. Macintosh B. Czekala I. 2022-10-04T11:53:01Z 2021-12-07T16:20:24Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr stellar-ages stellar-spectral-types visible-astronomy Age is a fundamental parameter of stars, yet in many cases, ages of individual stars are presented without robust estimates of the uncertainty. We have developed a Bayesian framework, BAFFLES, to produce the age posterior for a star from its calcium emission strength (log(R_HK_^'^)) or lithium abundance (Li EW) and B-V color. We empirically determine the likelihood functions for calcium and lithium as functions of age from literature measurements of stars in benchmark clusters with well-determined ages. We use a uniform prior on age, which reflects a uniform star formation rate. The age posteriors we derive for several test cases are consistent with literature ages found from other methods. BAFFLES represents a robust method to determine the age posterior probability distribution for any field star with 0.45<=B-V0.9 and a measurement of R_HK_^'^ and/or 0.35<=B-V<=1.9 and measured Li EW. We compile colors, R_HK_^'^, and Li EW from over 2630 nearby field stars from the literature, and present the derived BAFFLES age posterior for each star. 2020ApJ...898...27S https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/898/27 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to II/122 : UBV Photoelectric Catalog: data 1953-1985 (Mermilliod 1987) III/150 : Perkins Revised MK Types for the Cooler Stars (Keenan+ 1989) III/159 : Ca II H and K Measurements Made at MWO (Duncan+ 1991) I/259 : The Tycho-2 Catalogue (Hog+ 2000) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) I/284 : The USNO-B1.0 Catalog (Monet+ 2003) I/322 : UCAC4 Catalogue (Zacharias+, 2012) J/AJ/106/1059 : Lithium in the Pleiades (Soderblom+, 1993) J/AJ/111/439 : Chromospheric emission in late-type stars. (Henry+ 1996) J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999) J/A+A/348/897 : Ages of main-sequence stars (Lachaume+, 1999) J/MNRAS/306/361 : UBVI CCD photometry of M35 (NGC 2168) (Sung+ 1999) J/AJ/124/1670 : Post-T Tauri Stars in Sco-Cen Association (Mamajek+, 2002) J/ApJS/152/261 : Chromospheric Ca II emission in nearby stars (Wright+, 2004) J/AJ/132/161 : NStars project: The southern sample. I. (Gray+, 2006) J/MNRAS/372/163 : Activity indices for southern stars (Jenkins+, 2006) J/AJ/131/2967 : {alpha} Persei open cluster members (Makarov+, 2006) J/AJ/132/866 : New M dwarfs in solar neighborhood (Riaz+, 2006) J/A+A/460/695 : Associations Containing Young stars (Torres+, 2006) J/ApJ/687/1264 : Age estimation for solar-type dwarfs (Mamajek+, 2008) J/A+A/504/829 : Spec. survey of youngest field stars (Guillout+, 2009) J/AJ/138/312 : Activity of bright solar analogs (Hall+, 2009) J/ApJ/725/875 : Chromospheric activity for CPS stars (Isaacson+, 2010) J/MNRAS/403/1949 : UBV(RcIc)JHK photometry of HIP nearby stars (Koen+, 2010) J/A+A/520/A15 : RACE-OC project: YSOs within 100pc (Messina+, 2010) J/ApJ/734/70 : Chromospheric activity of Southern stars (Arriagada, 2011) J/A+A/530/A138 : Geneva-Copenhagen survey re-analysis (Casagrande+, 2011) J/ApJ/733/115 : Rotation periods and membership in M34 (Meibom+, 2011) J/AcA/62/67 : ASAS photometry of ROSAT sources (Kiraga, 2012) J/A+A/549/A109 : HARPS XXXI. The M-dwarf sample (Bonfils+, 2013) J/A+A/551/L8 : Chromospheric activity of field stars (Pace, 2013) J/ApJS/208/9 : Intrinsic colors & temperatures of PMS stars (Pecaut+, 2013) J/ApJ/794/159 : Statistical analysis of exoplanet surveys (Brandt+, 2014) J/MNRAS/454/593 : Young moving groups in solar neighbourhood (Bell+, 2015) J/ApJ/804/146 : Atmospheric parameters for nearby B-F stars (David+, 2015) J/AJ/149/119 : Radial velocities of stars in NGC 2264 (Tobin+, 2015) J/MNRAS/461/794 : Scorpius-Centaurus K-Type Stars (Pecaut+, 2016) J/AJ/154/69 : ACRONYM II. {beta} Pictoris Moving Group (Shkolnik+, 2017) J/AJ/156/37 : Li abund. of cool dwarfs in M35 (Anthony-Twarog+, 2018) J/A+A/616/A108 : Cool stars chromospheric activity (Boro Saikia+, 2018) J/A+A/612/A99 : Gaia-ESO Survey in open star cluster fields (Randich+, 2018) J/AJ/158/13 : The first 300 stars observed by the GPIES (Nielsen+, 2019) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/898/27 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/898/27 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/898/27 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/898/27 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/898/27 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/898/27 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJ/898/27/table2 (BAFFLES ages for nearby stars) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/898/27/table2? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/898/27/table2? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/898/27/table2? 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44931 44935 44956 44981 45029 45034 45062 45107 45112 45121 45135 45137 45175 45196 45237-45238 45241 45253 45258 45272 45299 45309 45337 45351 45382 45388 45396 45420 45430 45444 45458 45472 45485 45511 45527 45541 45544 45551 45621 45627 45646 45653-45654 45668 45673 45687 45770 45799 45811 45834 45843 45865 45874 45892 45917 45927 45929 45941 45944 45948 45956 45986 45992 46022 46040 46056 46065 46076 46080 46083 46100-46101 46113 46129 46135 46145 46160 46170 46172 46234 46247-46248 46263 46277 46297 46306 46320 46325 46333 46342 46363 46467 46472-46473 46481-46482 46484 46488 46501 46523 46526 46551 46581 46593 46603 46626-46627 46640 46654-46655 46682 46685 46728 46734 46750 46765 46767-46768 46777 46790 46800 46820 46843 46874 46916 46922-46923 46944 46967 46977 46982 46987 46991-46992 46998 47001 47020 47027 47045 47073 47107 47114 47120 47127 47133 47137 47176 47183 47198 47205 47232 47234-47235 47274 47279 47287 47292 47311 47377 47385 47429-47430 47461 47463 47502 47543 47550 47576 47584 47598 47606 47638 47663 47702 47706 47730 47742 47754 47780 47791 47824 47842 47858 47863 47873 47894 47904 47910 47918-47919 47930 47935 47943 47945 47949 47953 47959 47975 47985 47991 48004 48007 48014-48015 48019 48022 48065 48082 48104-48105 48119-48120 48172 48176 48182 48199 48202 48212 48223 48230 48249 48254 48259 48274 48283 48291 48305 48334-48335 48373 48394 48402 48414 48545 48583 48607 48658 48672 48705 48736 48757 48773 48785 48807 48821 48862 48883 48905 48915 48943 48955 48967 48980 49026 49064 49084 49089 49097 49118 49128 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/898/27?format=ascii Optical default J/ApJ/898/27/table2 BAFFLES ages for nearby stars SpType Spectral type src.spType char Ref Reference code(s) (1) meta.note char SimbadName Simbad column added by the CDS meta.id char nullable recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int ID Source identifier meta.id;meta.main char RAJ2000 Hour of Right Ascension (J2000) pos.eq.ra;meta.main DEJ2000 Degree of Declination (J2000) pos.eq.dec;meta.main B-V [0.45/1.74] The (B-V) color index mag phot.color;em.opt.B;em.opt.V float logRHK [-5/-3.7]? log calcium emission strength index; logR'_HK_ spect.index float nullable EW [-3.3/570]? Lithum equivalent width; in milli-Angstrom units 1e-13m spect.line.eqWidth float nullable 2.5Age1 [1.8/2850]? R'_HK_ age 2.5% posterior CDF value Myr time.age float nullable 16Age1 [8.8/5730]? R'_HK_ age 16% posterior CDF value Myr time.age float nullable 50Age1 [69.2/8980]? R'_HK_ age 50% posterior CDF value Myr time.age float nullable 84Age1 [443/11700]? R'_HK_ age 84% posterior CDF value Myr time.age int nullable 97.5Age1 [1660/12800]? R'_HK_ age 97.5% posterior CDF value Myr time.age int nullable 2.5Age2 [1.2/1510]? Li EW age 2.5% posterior CDF value Myr spect.line.eqWidth float nullable 16Age2 [2.47/4300]? Li EW age 16% posterior CDF value Myr spect.line.eqWidth float nullable 50Age2 [5.6/8380]? Li EW age 50% posterior CDF value Myr spect.line.eqWidth float nullable 84Age2 [10/11600]? Li EW age 84% posterior CDF value Myr spect.line.eqWidth float nullable 97.5Age2 [29/12800]? Li EW age 97.5% posterior CDF value Myr spect.line.eqWidth float nullable 2.5AgeF [1.2/2850] Final age 2.5% posterior CDF value Myr time.age float 16AgeF [2.47/5730] Final age 16% posterior CDF value Myr time.age float 50AgeF [5.6/8980] Final age 50% posterior CDF value Myr time.age float 84AgeF [10/11700] Final age 84% posterior CDF value Myr time.age float 97.5AgeF [29/12800] Final age 97.5% posterior CDF value Myr time.age float BVCat Display data from Boro Saikia+, 2018, J/A+A/616/A108 and Guillout+, 2009, J/A+A/504/829 within 2" meta.ref.url int nullable