J/AJ/157/78 Double & multiple star systems from GaiaDR2 (Jimenez-Esteban+, 2019)
A catalog of wide binary and multiple systems of bright stars from Gaia-DR2
and the Virtual Observatory.
Jimenez-Esteban F.M., Solano E., Rodrigo C.
<Astron. J., 157, 78-78 (2019)>
=2019AJ....157...78J 2019AJ....157...78J (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Stars, bright ; Radial velocities ;
Parallaxes, trigonometric ; Proper motions ; Photometry ;
Optical ; Effective temperatures ; Extinction ; Stars, masses
Keywords: astronomical databases: miscellaneous - binaries: visual - catalogs -
parallaxes - proper motions - virtual observatory tools
Abstract:
Binary and multiple stars have long provided an effective empirical method
of testing stellar formation and evolution theories. In particular, the
existence of wide binary systems (separations >20000 au) is particularly
challenging to binary formation models as their physical separations
are beyond the typical size of a collapsing cloud core (∼5000-10000 au).
We mined the recently published Gaia-DR2 catalog (Cat. I/345) to identify
bright comoving systems in the five-dimensional space (sky position,
parallax, and proper motion). We identified 3741 comoving binary and
multiple stellar candidate systems, out of which 575 have compatible
radial velocities for all the members of the system. The candidate systems
have separations between ∼400 and 500000 au. We used the analysis tools
of the Virtual Observatory to characterize the comoving system members
and to assess their reliability. The comparison with previous comoving
systems catalogs obtained from TGAS showed that these catalogs contain
a large number of false systems. In addition, we were not able to confirm
the ultra-wide binary population presented in these catalogs. The
robustness of our methodology is demonstrated by the identification of
well known comoving star clusters and by the low contamination rate for
comoving binary systems with projected physical separations <50000 au.
These last constitute a reliable sample for further studies. The catalog
is available online at the Spanish Virtual Observatory portal
(http://svo2.cab.inta-csic.es/vocats/v2/comovingGaiaDR2/).
Description:
We used Gaia-DR2 data (Cat. I/345) to search for comoving systems among
the brightest stars in the sky, i.e., those included in the Tycho-2 catalog
(Hog et al. 2000, Cat. I/259), using a simple approach based on the
astrometric solution. Restricting our search to the ∼2.5 million Tycho-2
sources implies that comoving systems with a low-mass and faint companion
will not be detected. Since the limiting magnitude of Tycho-2 was ∼11.5 mag
in the visible, we estimate that Tycho-2 is completed up to ∼40 pc for
M dwarfs, up to ∼200 pc for G dwarfs, and up to ∼400 pc for F dwarfs.
This workflow resulted in 11834 individual sources grouped into 3852
comoving binary and multiple candidate systems that fulfilled the previous
conditions. In order to help the astronomical community in the use of
the catalog of comoving star systems, we have built an archive system
that can be accessed from a web page
(http://svo2.cab.inta-csic.es/vocats/v2/comovingGaiaDR2/) or through a
Virtual Observatory ConeSearch. Table 2 lists the data accessible through
the catalog.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 617 11550 Double and multiple star systems from Gaia-DR2
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See also:
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
I/276 : Tycho Double Star Catalogue (TDSC) (Fabricius+ 2002)
III/279 : RAVE 5th data release (Kunder+, 2017)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/A+A/492/277 : Analysis of Collinder 69 stars with VOSA (Bayo+, 2008)
J/AJ/153/257 : Comoving stars in Gaia DR1 (Oh+, 2017)
J/MNRAS/472/675 : Wide binaries in Tycho-Gaia: search method (Andrews+, 2017)
http://svo2.cab.inta-csic.es/vocats/v2/comovingGaiaDR2/ : The SVO archive of
double and multiple star systems from Gaia-DR2
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 17 F17.13 deg RAdeg Right Ascension in decimal degrees (J2000)
19- 35 F17.13 deg DEdeg Declination in decimal degrees (J2000)
37- 57 F21.17 deg RAGdeg Gaia-DR2 Right Ascension in decimal degrees
(ICRS) at Ep=2015.5
59- 80 F22.18 deg DEGdeg Gaia-DR2 Declination in decimal degrees
(ICRS) at Ep=2015.5
82-100 I19 --- GaiaDR2 Gaia-DR2 identifier (Cat. I/345)
102-112 A11 --- Tycho2 Tycho-2 identifier (Cat. I/259)
114-146 A33 --- Name Simbad name
148-229 A82 --- Link Link to Simbad object
231-234 I4 --- GroupID [1/3741] ID for match group
236-237 I2 --- GroupSize [2/94] Number of rows in match group
239-259 F21.16 arcsec Sep1 [1.78768/9162.51]? Angular separation in
the plane of the sky
261-281 F21.13 AU Sep2 [405.023/2.29329e+06]? Projected physical
separation in the plane of the sky
283-289 F7.2 km/s RV [-102.39/125.56]? Gaia-DR2 radial velocity
291-295 F5.2 km/s e_RV [0.11/19.9]? Error on RV
297-303 F7.4 mas Plx [0.3672/22.8692] Gaia-DR2 parallax
305-324 F20.18 mas e_Plx [0.0286166/0.950632] Estimated Gaia-DR2
parallax total error
326-349 F24.19 mas/yr pmRA [-222.445/122.917] Gaia-DR2 proper motion
in RA corrected for the inertial spin
(pmRA*cosDE)
351-370 F20.18 mas/yr e_pmRA [0.0476868/1.58815] Error on pmRA
372-394 F23.18 mas/yr pmDE [-135.99/152.688] Gaia-DR2 proper motion
in DE corrected for the inertial spin
396-415 F20.18 mas/yr e_pmDE [0.0471825/1.21189] Error on pmDE
417-425 F9.6 mag Gmag [3.69949/12.9972] Gaia-DR2 G band mean
magnitude
427-435 F9.6 mag BPmag [3.82579/13.3007] Gaia-DR2 GBP band mean
magnitude
437-445 F9.6 mag RPmag [3.15896/12.837] Gaia-DR2 GRP band mean
magnitude
447-464 F18.16 --- RUWE [0.606624/1.39958] Gaia-DR2 re-normalized
unit weight error
466-473 F8.3 km/s HRV [-717.138/696.16]? Heliocentric radial
velocity from RAVE (Cat. III/279)
475-480 F6.3 km/s e_HRV [0.438/77.328]? Error on HRV
482 A1 --- Class [DG] Dwarf/Giant classification
484-488 I5 K Teff [2500/40000]? Effective temperature of
the model in Kelvin from VOSA (Bayo et al.
2008, J/A+A/492/277)
490-500 F11.6 K e_Teff [50/1388.96]? Error on Teff
502-514 F13.10 mag Av [-0.4/5.61]? Visual extinction used in VOSA
516-524 F9.6 Msun Mass [0.540657/12.4077]? Mass
526-535 F10.8 Msun e_Mass [0.00110388/0.463406]? Error on Mass
537-548 E12.8 J U [1.44084e+33/7.09831e+36]? Binding energy
550-561 E12.8 J e_U [4.55197e+31/2.61545e+35]? Error on U
563-573 F11.6 Gyr tD [0.574761/1052.92]? Dissipation lifetime
575-584 F10.7 Gyr e_tD [0.0130166/42.8812]? Error on tD
586-595 F10.7 Gyr tMS [0.0184405/46.526]? Main-sequence lifetime
597-607 F11.9 Gyr e_tMS [0.000769014/4.04013]? Error on tMS
609-617 F9.7 --- ECAC [0.0108108/3.07692]? Expected chance
alignment counterparts
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History:
Downloaded from: http://svo2.cab.inta-csic.es/vocats/v2/comovingGaiaDR2
(End) Tiphaine Pouvreau [CDS] 13-Jun-2019