J/A+A/638/A145 GALAH survey. FGK binary stars (Traven+, 2020)
The GALAH survey: Multiple stars and our Galaxy.
I. A comprehensive method for deriving properties of FGK binary stars.
Traven G., Feltzing S., Merle T., Van der Swaelmen M., Cotar K., Church R.,
Zwitter T., Ting Y.-S., Sahlholdt C., Asplund M., Bland-Hawthorn J.,
De Silva G., Freeman K., Martell S., Sharma S., Zucker D., Buder S.,
Casey A., D'Orazi V., Kos J., Lewis G., Lin J., Lind K., Simpson J.,
Stello D., Munari U., Wittenmyer R.A.
<Astron. Astrophys. 638, A145 (2020)>
=2020A&A...638A.145T 2020A&A...638A.145T (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, spectroscopic ; Photometry, infrared ; Optical ;
Effective temperatures ; Abundances ; Radial velocities ;
Stars, diameters
Keywords: methods: data analysis - techniques: radial velocities -
catalogs - stars: statistics - binaries: spectroscopic
Abstract:
Binary stellar systems form a large fraction of the Galaxy's stars.
They are useful as laboratories for studying the physical processes
taking place within stars, and must be correctly taken into account
when observations of stars are used to study the structure and
evolution of the Galaxy. We present a sample of 12760
well-characterised double-lined spectroscopic binaries that are
appropriate for statistical studies of the binary populations. They
were detected as SB2s using a t-distributed stochastic neighbour
embedding (t-SNE) classification and a cross-correlation analysis of
GALAH spectra. This sample consists mostly of dwarfs, with a
significant fraction of evolved stars and several dozen members of the
giant branch. To compute parameters of the primary and secondary star
(Teff[1,2], logg[1,2], [Fe/H], Vr[1,2], vmic[1,2], vbroad[1,2],
R[1,2], and E(B-V)), we used a Bayesian approach that includes a
parallax prior from Gaia DR2, spectra from GALAH, and apparent
magnitudes from APASS, Gaia DR2, 2MASS, and WISE. The derived stellar
properties and their distributions show trends that are expected for a
population of close binaries (a<10AU) with mass ratios 0.5≤q≤1. The
derived metallicity of these binary stars is statistically lower than
that of single dwarf stars from the same magnitude-limited sample.
Description:
We here analyse a specific data-set: the extended GALAH dataset. This
consists of stellar spectra from the GALAH survey (reduced as
explained in Kos et al., 2017MNRAS.464.1259K 2017MNRAS.464.1259K), apparent magnitudes
from a variety of photometric catalogues (AAVSO Photometric All Sky
Survey - APASS; Henden et al. 2016, Cat. II/336, Gaia DR2; Gaia
Collaboration et al. 2018, Cat. I/345. Two Micron All Sky Survey -
2MASS; Skrutskie et al. 2006, Cat. VII/233, Wide-field Infrared Survey
Explorer - WISE; Wright et al. 2010, Cat. II/311), and the parallax
measurements from Gaia DR2.
The data provided in this catalogue are described in Table A.1 of the
paper.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 2381 12760 Catalogue of 12760 successfully analysed binary
stars (described in table A1 of the paper)
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See also:
II/336 : AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/MNRAS/478/4513 : GALAH Survey DR2 (Buder+, 2018)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 15 I15 --- spectID Unique per-observation star ID
(spectrum ID) (sobject_id)
17- 32 A16 --- 2MASS 2MASS ID number by default (star_id)
34- 52 I19 --- GaiaDR2 Gaia DR2 identifier (gaia_id)
54- 57 I4 --- Field ? GALAH field identification number
(field_id)
59- 75 F17.13 deg RAdeg Right ascension from 2MASS, J2000
(raj2000)
77- 94 F18.14 deg DEdeg Declination from 2MASS, J2000 (dej2000)
96- 101 F6.3 mag Bmag ? B magnitude from APASS (Bmag)
103- 107 F5.3 mag e_Bmag ? Uncertainty of Bmag (e_Bmag)
109- 114 F6.3 mag Vmag ? V magnitude from APASS (Vmag)
116- 120 F5.3 mag e_Vmag ? Uncertainty of Vmag (e_Vmag)
122- 139 F18.15 mag GBPmag ? G_BP magnitude from Gaia DR2 (GBPmag)
141- 162 F22.20 mag e_GBPmag ? Uncertainty of GBPmag (e_GBPmag)
164- 181 F18.15 mag Gmag G magnitude from Gaia DR2 (Gmag)
183- 204 E22.20 mag e_Gmag Uncertainty of Gmag (e_Gmag)
206- 223 F18.15 mag GRPmag ? G_RP magnitude from Gaia DR2 (GRPmag)
225- 246 F22.20 mag e_GRPmag ? Uncertainty of GRPmag (e_GRPmag)
248- 253 F6.3 mag Jmag ? J magnitude from 2MASS (Jmag)
255- 259 F5.3 mag e_Jmag ? Uncertainty of Jmag (e_Jmag)
261- 266 F6.3 mag Hmag ? H magnitude from 2MASS (Hmag)
268- 272 F5.3 mag e_Hmag ? Uncertainty of Hmag (e_Hmag)
274- 279 F6.3 mag Kmag ? Ks magnitude from 2MASS (Kmag)
281- 285 F5.3 mag e_Kmag ? Uncertainty of Kmag (e_Kmag)
287- 292 F6.3 mag W1mag ? W1 magnitude from WISE (W1mag)
294- 298 F5.3 mag e_W1mag ? Uncertainty of W1mag (e_W1mag)
300- 305 F6.3 mag W2mag ? W2 magnitude from WISE (W2mag)
307- 311 F5.3 mag e_W2mag ? Uncertainty of W2mag (e_W2mag)
313- 333 F21.18 mas plx Parallax from Gaia DR2 (parallax)
335- 354 F20.18 mas e_plx Uncertainty of parallax (e_parallax)
356- 371 F16.12 --- snc1 ? S/N per pixel in the HERMES
blue channel (sn_c1)
373- 387 F15.11 --- snc2 ? S/N per pixel in the HERMES
green channel (sn_c2)
389- 403 F15.11 --- snc3 ? S/N per pixel in the HERMES red channel
(sn_c3)
405- 420 F16.12 --- snc4 ? S/N per pixel in the HERMES IR channel
(sn_c4)
422- 423 I2 --- Flag [0/32]? Flags in a bitmask format
(flag_cannon)
425- 442 F18.13 K Teff1-16 Effective temperature - primary component
16 percentile (teff1_16)
444- 461 F18.13 K Teff1-50 Effective temperature - primary component
50 percentile (teff1_50)
463- 480 F18.13 K Teff1-84 Effective temperature - primary component
84 percentile (teff1_84)
482- 499 F18.13 K Teff1-mean Effective temperature - primary component
mean value (teff1_mean)
501- 518 F18.13 K Teff1-mode Effective temperature - primary component
mode value (teff1_mode)
520- 537 F18.13 K Teff2-16 Effective temperature - secondary
component 16 percentile (teff2_16)
539- 556 F18.13 K Teff2-50 Effective temperature - secondary
component 50 percentile (teff2_50)
558- 575 F18.13 K Teff2-84 Effective temperature - secondary
component 84 percentile (teff2_84)
577- 594 F18.13 K Teff2-mean Effective temperature - secondary
component mean value (teff2_mean)
596- 613 F18.13 K Teff2-mode Effective temperature - secondary
component mode value (teff2_mode)
615- 632 F18.16 [cm/s2] logg1-16 Surface gravity - primary component
16 percentile (logg1_16)
634- 651 F18.16 [cm/s2] logg1-50 Surface gravity - primary component
50 percentile (logg1_50)
653- 670 F18.16 [cm/s2] logg1-84 Surface gravity - primary component
84 percentile (logg1_84)
672- 689 F18.16 [cm/s2] logg1-mean Surface gravity - primary component
mean value (logg1_mean)
691- 708 F18.16 [cm/s2] logg1-mode Surface gravity - primary component
mode value (logg1_mode)
710- 727 F18.16 [cm/s2] logg2-16 Surface gravity - secondary component
16 percentile (logg2_16)
729- 746 F18.16 [cm/s2] logg2-50 Surface gravity - secondary component
50 percentile (logg2_50)
748- 765 F18.16 [cm/s2] logg2-84 Surface gravity - secondary component
84 percentile (logg2_84)
767- 784 F18.16 [cm/s2] logg2-mean Surface gravity - secondary component
mean value ( logg2_mean)
786- 803 F18.16 [cm/s2] logg2-mode Surface gravity - secondary component
mode value (logg2_mode)
805- 827 E23.20 [-] [Fe/H]-16 Iron abundance ([Fe/H])
16 percentile (feh_16)
829- 850 E22.20 [-] [Fe/H]-50 Iron abundance ([Fe/H])
50 percentile (feh_50)
852- 874 F23.20 [-] [Fe/H]-84 Iron abundance ([Fe/H])
84 percentile (feh_84)
876- 898 F23.20 [-] [Fe/H]-mean Iron abundance ([Fe/H])
mean value (feh_mean)
900- 922 E23.20 [-] [Fe/H]-mode Iron abundance ([Fe/H])
mode value (feh_mode)
924- 948 F25.20 km/s RV1-16 RV - primary component
16 percentile (V1_16)
950- 974 F25.20 km/s RV1-50 RV - primary component
50 percentile (V1_50)
976- 997 E22.19 km/s RV1-84 RV - primary component
84 percentile (V1_84)
999-1020 E22.20 km/s RV1-mean RV - primary component
mean value (V1_mean)
1022-1044 E23.20 km/s RV1-mode RV - primary component
mode value (V1_mode)
1046-1069 F24.19 km/s RV2-16 RV - secondary component
16 percentile (V2_16)
1071-1093 F23.18 km/s RV2-50 RV - secondary component
50 percentile (V2_50)
1095-1117 F23.18 km/s RV2-84 RV - secondary component
84 percentile (V2_84)
1119-1141 F23.18 km/s RV2-mean RV - secondary component
mean value (V2_mean)
1143-1166 F24.19 km/s RV2-mode RV - secondary component
mode value (V2_mode)
1168-1186 F19.17 --- ratio1-16 Ratio of spectral flux in GALAH band 1
16 percentile (ratio1_16)
1188-1206 F19.17 --- ratio1-50 Ratio of spectral flux in GALAH band 1
50 percentile (ratio1_50)
1208-1226 F19.17 --- ratio1-84 Ratio of spectral flux in GALAH band 1
84 percentile (ratio1_84)
1228-1246 F19.17 --- ratio1-mean Ratio of spectral flux in GALAH band 1
mean value (ratio1_mean)
1248-1267 F20.18 --- ratio1-mode Ratio of spectral flux in GALAH band 1
mode value (ratio1_mode)
1269-1288 F20.18 --- ratio2-16 Ratio of spectral flux in GALAH band 2
16 percentile (ratio2_16)
1290-1308 F19.17 --- ratio2-50 Ratio of spectral flux in GALAH band 2
50 percentile (ratio2_50)
1310-1328 F19.17 --- ratio2-84 Ratio of spectral flux in GALAH band 2
84 percentile (ratio2_84)
1330-1348 F19.17 --- ratio2-mean Ratio of spectral flux in GALAH band 2
mean value (ratio2_mean)
1350-1369 F20.18 --- ratio2-mode Ratio of spectral flux in GALAH band 2
mode value (ratio2_mode)
1371-1390 F20.18 --- ratio3-16 Ratio of spectral flux in GALAH band 3
16 percentile (ratio3_16)
1392-1410 F19.17 --- ratio3-50 Ratio of spectral flux in GALAH band 3
50 percentile (ratio3_50)
1412-1430 F19.17 --- ratio3-84 Ratio of spectral flux in GALAH band 3
84 percentile (ratio3_84)
1432-1450 F19.17 --- ratio3-mean Ratio of spectral flux in GALAH band 3
mean value (ratio3_mean)
1452-1470 F19.17 --- ratio3-mode Ratio of spectral flux in GALAH band 3
mode value (ratio3_mode)
1472-1491 F20.18 --- ratio4-16 Ratio of spectral flux in GALAH band 4
16 percentile (ratio4_16)
1493-1511 F19.17 --- ratio4-50 Ratio of spectral flux in GALAH band 4
50 percentile (ratio4_50)
1513-1531 F19.17 --- ratio4-84 Ratio of spectral flux in GALAH band 4
84 percentile (ratio4_84)
1533-1551 F19.17 --- ratio4-mean Ratio of spectral flux in GALAH band 4
mean value (ratio4_mean)
1553-1571 F19.17 --- ratio4-mode Ratio of spectral flux in GALAH band 4
mode value (ratio4_mode)
1573-1590 F18.16 km/s vmic1-16 Microturbulence - primary component
16 percentile (vmic1_16)
1592-1609 F18.16 km/s vmic1-50 Microturbulence - primary component
50 percentile (vmic1_50)
1611-1628 F18.16 km/s vmic1-84 Microturbulence - primary component
84 percentile (vmic1_84)
1630-1647 F18.16 km/s vmic1-mean Microturbulence - primary component
mean value (vmic1_mean)
1649-1666 F18.16 km/s vmic1-mode Microturbulence - primary component
mode value (vmic1_mode)
1668-1685 F18.16 km/s vmic2-16 Microturbulence - secondary component
16 percentile (vmic2_16)
1687-1704 F18.16 km/s vmic2-50 Microturbulence - secondary component
50 percentile (vmic2_50)
1706-1723 F18.16 km/s vmic2-84 Microturbulence - secondary component
84 percentile (vmic2_84)
1725-1742 F18.16 km/s vmic2-mean Microturbulence - secondary component
mean value (vmic2_mean)
1744-1761 F18.16 km/s vmic2-mode Microturbulence - secondary component
mode value (vmic2_mode)
1763-1781 F19.16 km/s vbroad1-16 Line broadening - primary component
16 percentile (vbroad1_16)
1783-1801 F19.16 km/s vbroad1-50 Line broadening - primary component
50 percentile (vbroad1_50)
1803-1821 F19.16 km/s vbroad1-84 Line broadening - primary component
84 percentile (vbroad1_84)
1823-1841 F19.16 km/s vbroad1-mean Line broadening - primary component
mean value (vbroad1_mean)
1843-1861 F19.16 km/s vbroad1-mode Line broadening - primary component
mode value (vbroad1_mode)
1863-1881 F19.16 km/s vbroad2-16 Line broadening - secondary component
16 percentile (vbroad2_16)
1883-1901 F19.16 km/s vbroad2-50 Line broadening - secondary component
50 percentile (vbroad2_50)
1903-1921 F19.16 km/s vbroad2-84 Line broadening - secondary component
84 percentile (vbroad2_84)
1923-1941 F19.16 km/s vbroad2-mean Line broadening - secondary component
mean value (vbroad2_mean)
1943-1961 F19.16 km/s vbroad2-mode Line broadening - secondary component
mode value (vbroad2_mode)
1963-1984 E22.20 mag E(B-V)-16 Interstellar reddening
16 percentile (reddening_16)
1986-2007 E22.20 mag E(B-V)-50 Interstellar reddening
50 percentile (reddening_50)
2009-2030 E22.20 mag E(B-V)-84 Interstellar reddening
84 percentile (reddening_84)
2032-2053 E22.20 mag E(B-V)-mean Interstellar reddening
mean value (reddening_mean)
2055-2076 E22.20 mag E(B-V)-mode Interstellar reddening
mode value (reddening_mode)
2078-2098 F21.17 Rsun R1-16 Stellar radius - primary component
16 percentile (r1_16)
2100-2119 F20.17 Rsun R1-50 Stellar radius - primary component
50 percentile (r1_50)
2121-2141 F21.17 Rsun R1-84 Stellar radius - primary component
84 percentile (r1_84)
2143-2163 F21.17 Rsun R1-mean Stellar radius - primary component
mean value (r1_mean)
2165-2185 F21.17 Rsun R1-mode Stellar radius - primary component
mode value (r1_mode)
2187-2207 F21.17 Rsun R2-16 Stellar radius - secondary component
16 percentile (r2_16)
2209-2228 F20.17 Rsun R2-50 Stellar radius - secondary component
50 percentile (r2_50)
2230-2250 F21.17 Rsun R2-84 Stellar radius - secondary component
84 percentile (r2_84)
2252-2272 F21.17 Rsun R2-mean Stellar radius - secondary component
mean value (r2_mean)
2274-2294 F21.17 Rsun R2-mode Stellar radius - secondary component
mode value (r2_mode)
2296-2316 F21.14 --- chi2 Overall chi2 of the fit
(chi2binarypipeline)
2318-2338 F21.14 --- chi2sp Chi2 of the spectroscopic fit
(chi2binarypipeline_spec)
2340-2361 F22.16 --- chi2ph Chi2 of the photometric fit
(chi2binarypipeline_phot)
2363-2381 F19.16 --- RUWE ? Renormalised unit weight error (ruwe)
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Acknowledgements:
Gregor Traven, gregor.traven(at)astro.lu.se
(End) Patricia Vannier [CDS] 07-Jun-2020