J/ApJ/867/151 YSOs in the Gould Belt regions with Gaia-DR2 data (Dzib+, 2018)
Distances and kinematics of Gould Belt star-forming regions with
Gaia DR2 results.
Dzib S.A., Loinard L., Ortiz-Leon G.N., Rodriguez L.F., Galli P.A.B.
<Astrophys. J., 867, 151 (2018)>
=2018ApJ...867..151D 2018ApJ...867..151D
ADC_Keywords: YSOs; Star Forming Region; Parallaxes, trigonometric;
Proper motions; Positional data; Optical
Keywords: astrometry ; stars: formation ; stars: kinematics and dynamics
Abstract:
We present an analysis of the astrometric results from the Gaia second
data release (DR2) for young stellar objects (YSOs) in star-forming
regions related to the Gould Belt (GB). These regions are Barnard 59,
Lupus 1 to 4, Chamaeleon I and II, ε Chamaeleontis, the
Cepheus flare, IC 5146, and Corona Australis. The mean distance to the
YSOs in each region is consistent with earlier estimations, though a
significant improvement in the final errors was obtained. The mean
distances to the star-forming regions were used to fit an ellipsoid of
size (358±7)x(316±13)x(70±4)pc3, centered at
(X0,Y0,Z0)=(-82±15,39±7,-25±4)pc, consistent with recently
determined parameters of the GB. The mean proper motions were combined
with radial velocities from the literature to obtain the three-
dimensional motions of the star-forming regions, which are consistent
with a general expansion of the GB. We estimate that this expansion is
occurring at a velocity of 2.5±0.1km/s. This is the first time that
motions of YSOs have been used to investigate the kinematics of the
GB. As an interesting side result, we also identified stars with large
peculiar velocities.
Description:
We compiled an initial list of known young stars in star-forming
regions related to the Gould Belt (Barnard 59, Lupus 1 to 4,
Chamaeleon I and II, ε Chamaeleontis, the Cepheus flare,
IC5146, and Corona Australis) from the literature and we complemented
this with sources from the Simbad database. Then we searched in the
Gaia archive database to find which stars from this list have an
astrometric solution. The maximum allowed separation between the
position in the literature of the YSOs and the objects in the Gaia
catalog was 1". We also discarded those YSOs whose trigonometric
parallax is negative or indicative of a distance well beyond the value
estimated for the regions where they belong.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 124 356 Astrometric parameters of YSOs used in our
analysis from the Gaia-DR2 catalog (I/345)
table4.dat 72 14 Distances, mean proper motions, and mean radial
velocities of star-forming regions
in the Gould Belt
--------------------------------------------------------------------------------
See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/A+AS/146/323 : RASS young sources around R CrA (Neuhaeuser+, 2000)
J/ApJ/680/495 : Interstellar clouds survey in the Gould belt (Harvey+, 2008)
J/ApJ/702/178 : YSOs in the central 400pc of the Galaxy (Yusef-Zadeh+, 2009)
J/ApJ/723/1019 : Galactic SFR and gas surface densities (Heiderman+, 2010)
J/ApJS/194/43 : YSOs candidates and knots in CrA cloud (Peterson+, 2011)
J/PAZh/39/601 : Galactic kinematics from YSOs sample (Bobylev+, 2013)
J/MNRAS/438/1848 : NGC 7129 Vilnius photometry (Straizys+, 2014)
J/A+A/584/A26 : Cosmography of OB stars in solar neighbourhood (Bouy+, 2015)
J/ApJ/806/231 : MISFITS survey: HCO+ obs. of Spitzer YSOs (Heiderman+, 2015)
J/ApJS/220/11 : SEDs of Spitzer YSOs in the Gould Belt (Dunham+, 2015)
J/ApJ/834/142 : Gould's Belt Distances Survey. II. (Kounkel+,2017)
J/ApJ/859/33 : GOBELINS. IV. VLBA obs. of Taurus (Galli+, 2018)
J/A+A/610/A64 : Distance to the clouds in Chamaeleon complex (Voirin+, 2018)
J/A+A/619/A106 : 3D shape of Orion A from Gaia DR2 (Grossschedl+, 2018)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 23 A23 --- Name YSO name
25- 43 I19 --- Gaia Gaia DR2 source identification number
45- 55 F11.7 deg RAdeg [163.4/342.4] Right ascension,
decimal degrees (ICRS) at Ep=2015.5 (1)
57- 67 F11.7 deg DEdeg [-79.9/78.4] Declination,
decimal degrees (ICRS) at Ep=2015.5 (1)
69- 73 F5.2 mas plx [0.6/11] Gaia DR2 parallax (1)
75- 78 F4.2 mas e_plx [0.01/1.2] Mean error on parallax (1)
80- 85 F6.2 mas/yr pmRA [-45.2/18] Proper motion in right ascension (1)
87- 90 F4.2 mas/yr e_pmRA [0.01/2.4] Mean error on proper motion in
right ascension (1)
92- 97 F6.2 mas/yr pmDE [-32.1/7] Proper motion in declination (1)
99-102 F4.2 mas/yr e_pmDE [0.01/1.8] Mean error on proper motion in
declination (1)
104-124 A21 --- Reg Star forming region
--------------------------------------------------------------------------------
Note (1): All values taken from Gaia DR2 (I/345) with truncation.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- Reg Star forming region
20- 24 F5.1 pc Dist [129.5/388] Distance
26- 29 F4.1 pc e_Dist [0.3/32] Dist uncertainty
31- 36 F6.2 mas/yr pmRA [-22.8/8.56] Proper motion along RA
38- 41 F4.2 mas/yr e_pmRA [0.02/0.2] pmRA uncertainty
43- 48 F6.2 mas/yr pmDE [-27.3/0.4] Proper motion along DEC
50- 53 F4.2 mas/yr e_pmDE [0.01/0.5] pmDE uncertainty
55- 58 F4.1 km/s RV [-1/27] Radial velocity
60- 63 F4.2 km/s e_RV [0.1/4]? RV uncertainty
65- 72 A8 --- Ref Reference(s) (1)
--------------------------------------------------------------------------------
Note (1): Reference as follows:
1 = This work
2 = Redaelli et al. (2017ApJ...850..202R 2017ApJ...850..202R)
3 = Kun et al. (2008hsf1.book..136K 2008hsf1.book..136K)
4 = Joergens (2006A&A...448..655J 2006A&A...448..655J)
5 = Biazzo et al. (2012A&A...547A.104B 2012A&A...547A.104B)
6 = Neuhauser et al. (2000, J/A+AS/146/323)
7 = Galli et al. (2013A&A...558A..77G 2013A&A...558A..77G)
8 = Kounkel et al. (2017, J/ApJ/834/142)
9 = Dzib et al. (2017ApJ...834..139D 2017ApJ...834..139D)
10 = Garcia-Diaz et al. (2008RMxAA..44..181G 2008RMxAA..44..181G)
11 = Ortiz-Leon et al. (2017ApJ...834..141O 2017ApJ...834..141O)
12 = Friesen et al. (2017ApJ...843...63F 2017ApJ...843...63F)
13 = Ortiz-Leon et al. (2018, J/ApJ/865/73)
14 = Galli et al. (2018, J/ApJ/859/33).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie FIX [CDS] 17-Oct-2019