J/A+A/642/A21 Astrometric parameters for 135 OB stars (Russeil+, 2020)
OB stars and YSO populations in the region of NGC 6334-NGC 6357 as seen with
Gaia-DR2.
Russeil D., Zavagno A., Nguyen A., Figueira M., Adami C., Bouret J.C.
<Astron. Astrophys. 642, A21 (2020)>
=2020A&A...642A..21R 2020A&A...642A..21R (SIMBAD/NED BibCode)
ADC_Keywords: H II regions ; Stars, OB ; YSOs ; Proper motions ;
Parallaxes, trigonometric
Keywords: stars: kinematics and dynamics - HII regions
Abstract:
Our goal is to better understand the origin and the star-formation
history of regions NGC 6334 and NGC 6357. We focus our study on the
young stars (young stellar objects and OB stars) kinematics in both
regions using mainly Gaia-DR2 data. For both regions we compiled OB
stars and young stellar objects catalogues from literature and we
complemented them using VPHAS+ DR2 and Spitzer IRAC/GLIMPSE photometry
catalogues. A cross-match is performed with the Gaia-DR2 catalogue in
order to obtain the parallax and transverse motion information. We
confirm that NGC 6334 and NGC 6357 are in the far side of the
Saggitarius-Carina arm at a distance of 1.76kpc. For NGC 6357, OB
stars show strong clustering and ordered star motion with
Vlon~-10.7km/s and Vlat ∼3.7km/s while for NGC 6334, no significant
systemic motion is observed. The OB stars motions and distribution in
NGC 6334 suggest to classify it as an association. Ten and two runaway
candidates can be related to NGC 6357 and NGC 6334, respectively. The
spatial distributions of the runaway candidates in and around NGC 6357
favor a dynamical (and early) ejection during the cluster(s)
formation. Because such stars are likely to be ejected during
cluster's formation the fact of not observing as many of such stars
towards NGC 6334 suggest different formation conditions than for NGC
6357.
Description:
Astrometric information of the 135 spectroscopic OB stars in the
regions NGC 6334 and NGC 6357.
For each star spectral type, equatorial coordinates, V and G
magnitudes, GAIA identifier, astrometric data, derived distance and
tranverse velocity components are given.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 194 135 Astrometric parameters for 135 OB stars
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See also:
J/A+A/538/A142 : OB stars in NGC 6334 and NGC 6357 (Russeil+, 2012)
J/A+A/607/A86 : NGC 6334 and NGC 6357 OB stars spectra (Russeil+, 2017)
Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Ident Star identification (1)
25- 37 A13 --- SpType MK spectral type (1)
39- 45 F7.3 deg RAdeg Right ascension (J2000.0) (1)
47- 53 F7.3 deg DEdeg Declination (J2000.0) (1)
55- 59 F5.2 mag Vmag V magnitude (1)
61- 79 I19 --- GaiaDR2 Gaia DR2 source identifier
81- 86 F6.3 mas Plx ? Parallax
88- 92 F5.3 mas e_Plx ? Parallax error
94- 98 F5.2 mas/yr pmRA ? Right ascension proper motion, pmRA*cosDE
100-103 F4.2 mas/yr e_pmRA ? Right ascension proper motion error
105-109 F5.2 mas/yr pmDE ? Declination proper motion
111-114 F4.2 mas/yr e_pmDE ? Declination proper motion error
116-120 F5.2 mag Gmag Gaia G-band magnitude
122-125 F4.2 arcsec theta Angular separation
127-130 F4.2 kpc Dbay ? Bayesian distance
132-135 F4.2 kpc e_Dbay ? Upper Bayesian distance error
137-140 F4.2 kpc E_Dbay ? Lower Bayesian distance error
142-148 F7.2 km/s Vlon ? Tranverse longitude velocity
150-155 F6.2 km/s e_Vlon ? Tranverse longitude velocity error
157-162 F6.2 km/s Vlat ? Tranverse latitude velocity
164-168 F5.2 km/s e_Vlat ? Tranverse latitude velocity error
170-175 F6.2 km/s Vtot ? Total transverse velocity
177-182 F6.2 km/s e_Vtot ? Total transverse velocity error
184-188 F5.1 deg PA ? Position angle of the velocity vector
190-194 F5.2 --- RUWE ? RUWE value
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Note (1): from Russeil et al., 2017, Cat. J/A+A/607/A86.
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Acknowledgements:
Delphine Russeil, delphine.russeil(at)lam.fr
References:
Russeil et al., 2017A&A...607A..86R 2017A&A...607A..86R, Cat. J/A+A/607/A86
(End) Delphine Russeil [LAM, France], Patricia Vannier [CDS] 04-Aug-2020