J/ApJ/834/142 Gould's Belt Distances Survey (GOBELINS). II. OMC (Kounkel+, 2017)
The Gould's Belt Distances Survey (GOBELINS)
II. Distances and structure toward the Orion Molecular Clouds.
Kounkel M., Hartmann L., Loinard L., Ortiz-Leon G.N., Mioduszewski A.J.,
Rodriguez L.F., Dzib S.A., Torres R.M., Pech G., Galli P.A.B., Rivera J.L.,
Boden A.F., Evans II N.J., Briceno C., Tobin J.J.
<Astrophys. J., 834, 142-142 (2017)>
=2017ApJ...834..142K 2017ApJ...834..142K (SIMBAD/NED BibCode)
ADC_Keywords: Molecular clouds ; Radio sources ; Parallaxes, trigonometric ;
Stars, distances ; Proper motions
Keywords: astrometry; ISM: individual objects: Orion Molecular Clouds;
parallaxes; radiation mechanisms: nonthermal;
stars: kinematics and dynamics
Abstract:
We present the results of the Gould's Belt Distances Survey of young
star-forming regions toward the Orion Molecular Cloud Complex. We
detected 36 young stellar objects (YSOs) with the Very Large Baseline
Array, 27 of which have been observed in at least three epochs over
the course of two years. At least half of these YSOs belong to
multiple systems. We obtained parallax and proper motions toward these
stars to study the structure and kinematics of the Complex. We
measured a distance of 388±5pc toward the Orion Nebula Cluster,
428±10pc toward the southern portion L1641, 388±10pc toward NGC
2068, and roughly ∼420pc toward NGC 2024. Finally, we observed a
strong degree of plasma radio scattering toward λ Ori.
Description:
The observations presented in this paper were made with the National
Radio Astronomy Observatory's Very Long Baseline Array (VLBA) at 5GHz
with a 256MHz bandwidth (spanning the range of 4.852-5.076GHz). They
span a period of two years from 2014 to 2016 March.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 77 355 Positions of sources identified in at least two
epochs or with a single >5σ detection
table5.dat 92 26 Distance and proper motion solutions
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See also:
J/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997)
J/A+A/337/183 : V1046 Ori uvby photometry and radial velocities (Bolton+ 1998)
J/AJ/123/387 : VRI photom. of λ Ori star-forming region (Dolan+, 2002)
J/A+A/458/461 : Binary stars in the Orion Nebula Cluster (Koehler+, 2006)
J/other/A+ARV/17.251 : Stars observed with Doppler imaging (Strassmeier, 2009)
J/ApJ/722/1092 : Optical photometry of the ONC. II. (Da Rio+, 2010)
J/ApJS/190/1 : A survey of stellar families (Raghavan+, 2010)
J/AJ/144/192 : Spitzer survey of Orion A & B. I. YSO catalog (Megeath+, 2012)
J/ApJ/753/149 : YSOVAR: 6 eclipsing binaries in Orion (Morales-Calderon+, 2012)
J/ApJ/764/114 : BVRI photometry of stars in Orion A (Hsu+, 2013)
J/A+A/564/A29 : Optical and near-infrared photometry in Orion A (Bouy+, 2014)
J/ApJ/790/49 : Gould's Belt VLA survey. III. Orion region (Kounkel+, 2014)
J/ApJ/786/29 : Catalog of distances to molecular clouds (Schlafly+, 2014)
J/ApJ/818/59 : IN-SYNC. IV. YSOs in Orion A (Da Rio+, 2016)
J/ApJ/821/8 : Spectrosc. binary population of ONC & NGC2264 (Kounkel+, 2016)
Byte-by-byte Description of file: table4.dat
-------------------------------------------------------------------------------
Bytes Format Units Label Explanations
-------------------------------------------------------------------------------
1- 3 I3 --- VLBA [1/165] VLBA index number
5 A1 --- YSO? [ny-] A YSO source? (- = unconfirmed)
7 I1 h RAh Hour of Right Ascension (J2000)
9- 10 I2 min RAm Minute of Right Ascension (J2000)
12- 20 F9.6 s RAs Second of Right Ascension (J2000)
22- 26 F5.3 mas e_RAs [0/1] Uncertainty in RAS
28 A1 --- DE- Sign of the Declination (J2000)
29- 30 I2 deg DEd Degree of Declination (J2000)
32- 33 I2 arcmin DEm Arcminute of Declination (J2000)
35- 43 F9.6 arcsec DEs Arcsecond of Declination (J2000)
45- 49 F5.3 mas e_DEs [0.002/1.3] Uncertainty in DEs
51- 57 I7 d JD Julian Date of the observation
59- 65 F7.3 mJy Flux [0.09/337.7] VLBA flux density at 5GHz
67- 71 F5.3 mJy e_Flux [0.03/1.8] Uncertainty in Flux
73- 77 F5.3 mJy rms [0.004/0.8] Field rms
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Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- VLBA [4/148] VLBA index number
4 A1 --- --- [/]
5- 7 I3 --- VLBA2 ? 2nd VLBA number
9- 11 A3 --- f_VLBA Flag(s) on VLBA (1)
13- 28 A16 --- Name Common name
30- 36 A7 --- SpT MK spectral type
38- 40 A3 --- r_SpT Reference for SpT (2)
42- 50 A9 --- Reg Region
52- 56 F5.3 mas Plx [1.8/3.4] Parallax
58- 62 F5.3 mas e_Plx [0.02/0.6] Plx uncertainty
64- 66 I3 pc Dist [302/536] Distance
68- 70 I3 pc e_Dist [4/113] Dist uncertainty
72- 76 F5.2 mas/yr pmRA [-7.3/4.9] Proper motion along RA
78- 81 F4.2 mas/yr e_pmRA [0.03/0.7] pmRA uncertainty
83- 87 F5.2 mas/yr pmDE [-3.8/7] Proper motion along DEC
89- 92 F4.2 mas/yr e_pmDE [0.07/1.4] pmDE uncertainty
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Note (1): Flag as follows:
a = Spectroscopic binary.
b = Detected only in three epochs. Uncertainties could be underestimated.
c = Astrometric binary.
d = Probable binary.
Note (2): Reference as follows:
H97 = Hillenbrand (1997, J/AJ/113/1733),
M12 = Morales-Calderon et al. (2012, J/ApJ/753/149),
S09 = Strassmeier (2009, J/other/A+ARV/17.251),
M88 = Marschall & Mathieu (1988AJ.....96.1956M 1988AJ.....96.1956M),
H99 = Houk & Swift (1999MSS...C05....0H 1999MSS...C05....0H)
H13 = Hsu et al. (2013, J/ApJ/764/114),
A00 = Alcala et al. (2000A&A...353..186A 2000A&A...353..186A),
S75 = Strom et al. (1975ApJ...196..489S 1975ApJ...196..489S).
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History:
From electronic version of the journal
References:
Ortiz-Leon et al. Paper I. 2017ApJ...834..141O 2017ApJ...834..141O
Ortiz-Leon et al. Paper II. 2017ApJ...834..142O 2017ApJ...834..142O This catalog
Ortiz-Leon et al. Paper III. 2017ApJ...834..143O 2017ApJ...834..143O
Galli et al. Paper IV. 2018ApJ...859...33G 2018ApJ...859...33G Cat. J/ApJ/859/33
Ortiz-Leon et al. Paper V. 2018ApJ...865...73O 2018ApJ...865...73O Cat. J/ApJ/865/73
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 07-Jul-2017