J/AJ/155/149 Properties of co-moving stars observed by Gaia (Bochanski+, 2018)
Fundamental properties of co-moving stars observed by Gaia.
Bochanski J.J., Faherty J.K., Gagne J., Nelson O., Coker K., Smithka I.,
Desir D., Vasquez C.
<Astron. J., 155, 149 (2018)>
=2018AJ....155..149B 2018AJ....155..149B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Stars, masses ; Stars, diameters ;
Abundances, [Fe/H] ; Stars, ages ; Stars, distances ; Extinction
Keywords: binaries: general - catalogs - stars: fundamental parameters
Abstract:
We have estimated fundamental parameters for a sample of co-moving stars
observed by Gaia and identified by Oh et al (2017, J/AJ/153/257). We
matched the Gaia observations to the 2MASS and Wide-Field Infrared
Survey Explorer catalogs and fit MIST isochrones to the data, deriving
estimates of the mass, radius, [Fe/H], age, distance, and extinction
to 9754 stars in the original sample of 10606 stars. We verify these
estimates by comparing our new results to previous analyses of nearby
stars, examining fiducial cluster properties, and estimating the
power-law slope of the local present-day mass function. A comparison
to previous studies suggests that our mass estimates are robust, while
metallicity and age estimates are increasingly uncertain. We use our
calculated masses to examine the properties of binaries in the sample
and show that separation of the pairs dominates the observed binding
energies and expected lifetimes.
Description:
Our catalog incorporates Gaia photometry and astrometry, as well as
photometry obtained during the Two-Micron All-Sky Survey (2MASS;
Skrutskie et al. 2006, Cat. VII/233) and by the Wide-Field Infrared
Sky Explorer satellite (WISE; Wright et al. 2010AJ....140.1868W 2010AJ....140.1868W).
We used the isochrone python module (Morton 2015ascl.soft03010M) to
estimate the fundamental parameters (mass, age, radius, [Fe/H],
distance, and extinction) of each star in our sample. The package uses
the MESA (Paxton et al. 2011ApJS..192....3P 2011ApJS..192....3P, 2013ApJS..208....4P 2013ApJS..208....4P,
2015ApJS..220...15P 2015ApJS..220...15P) Isochrones and Stellar Track library (MIST;
Choi et al. 2016ApJ...823..102C 2016ApJ...823..102C; Dotter 2016ApJS..222....8D 2016ApJS..222....8D) and computes
the posterior probability of fundamental parameters given the data.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 143 9754 Fundamental parameters
table2.dat 143 6 Stellar twins
table3.dat 143 20 Pairs with largest physical separations
table4.dat 143 20 Pairs with largest projected separations
--------------------------------------------------------------------------------
See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
J/AJ/153/257 : Comoving stars in Gaia DR1 (Oh+, 2017)
Byte-by-byte Description of file: table[1234].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- TGAS TGAS source identifier (Cat. I/337)
21- 28 F8.4 deg RAdeg Right Ascension in decimal degrees (J2000)
30- 37 F8.4 deg DEdeg Declination in decimal degrees (J2000)
39- 42 F4.2 Msun Mass [0.34/4.94] Stellar mass
44- 47 F4.2 Msun E_Mass [0/0.6] Upper uncertainty on Mass
49- 52 F4.2 Msun e_Mass [0/0.68] Lower uncertainty on Mass
54- 58 F5.2 Rsun Rad [0.45/31.86] Stellar radius
60- 63 F4.2 Rsun E_Rad [0/9.35] Upper uncertainty on Rad
65- 68 F4.2 Rsun e_Rad [0/7.06] Lower uncertainty on Rad
70- 74 F5.2 [Sun] [Fe/H] [-0.92/0.48] Metallicity
76- 79 F4.2 [Sun] E_[Fe/H] [0/0.4] Upper uncertainty on [Fe/H]
81- 84 F4.2 [Sun] e_[Fe/H] [0/0.35] Lower uncertainty on [Fe/H]
86- 90 F5.2 [yr] logAge [5.02/10.28] Log age
92- 95 F4.2 [yr] E_logAge [0/0.83] Upper uncertainty on logAge
97-100 F4.2 [yr] e_logAge [0/0.7] Lower uncertainty on logAge
102-106 F5.1 pc Dist [16.5/933.5] Distance (1)
108-111 F4.1 pc E_Dist [0.1/61.7] Upper uncertainty on Dist (1)
113-116 F4.1 pc e_Dist [0.1/62.9] Lower uncertainty on Dist (1)
118-121 F4.2 mag Av [0/2.75] Extinction
123-126 F4.2 mag E_Av [0/0.6] Upper uncertainty on Av
128-131 F4.2 mag e_Av [0/0.81] Lower uncertainty on Av
133-137 F5.2 pc Sep [8.1/10]? Separation (only in Tables 2 and 3)
139-143 F5.2 deg PSep [10.96/13.17]? Projected angular separation
(only in Table 4)
--------------------------------------------------------------------------------
Note (1): In Table 4, distances are estimated from isochronal fits.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 14-Nov-2018