J/AJ/129/907 New Ori OB1 members (Briceno+, 2005)
The CIDA variability survey of Orion OB1.
I. The low-mass population of Ori OB1a and 1b.
Briceno C., Calvet N., Hernandez J., Vivas A.K., Hartmann L., Downes J.J.,
Berlind P.
<Astron. J., 129, 907-926 (2005)>
=2005AJ....129..907B 2005AJ....129..907B
ADC_Keywords: Associations, stellar ; Surveys ; Stars, pre-main sequence
Keywords: stars: formation - stars: pre-main-sequence - surveys
Abstract:
We present results of a large-scale, multi-epoch optical survey of the
Orion OB1 association, carried out with the QUEST camera at the
Venezuela National Astronomical Observatory (CIDA). We identify for
the first time the widely spread low-mass, young population in the Ori
OB1a and OB1b subassociations. Candidate members were picked up by
their variability in the V band and position in color-magnitude
diagrams. We obtained spectra to confirm membership. In a region
spanning ∼68°2, we found 197 new young stars; of these, 56 are
located in the Ori OB1a subassociation and 141 in Ori OB1b.
Description:
The multiband, multi-epoch photometric survey was carried out using an
8000x8000 CCD mosaic camera built by the QUEST collaboration and
installed on the 1m (clear aperture) Schmidt Telescope at the Llano
del Hato National Astronomical Observatory, located at an elevation of
3610m in the Venezuelan Andes, close to the equator (8°47' north)
and under dark skies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 118 203 New Ori OB1 members
table4.dat 93 30 Other designations of new members
table6.dat 52 58 Properties of Ori OB1a stars
table7.dat 52 139 Properties of Ori OB1b stars
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See also:
II/36 : UBV and uvby-beta obs. of Orion OB1 Association (Warren+ 1977)
J/A+A/289/101 : Orion OB1 association. I. (Brown+, 1994)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- CVSO [1/197] The CVSO running number
5- 7 A3 --- f_CVSO Note on CVSO (1)
9- 24 A16 --- 2MASS The 2MASS identification number
26- 27 I2 h RAh Hour of the 2MASS Right Ascension (J2000)
29- 30 I2 min RAm Minute of the 2MASS Right Ascension (J2000)
32- 36 F5.2 s RAs Second of the 2MASS Right Ascension (J2000)
38 A1 --- DE- Sign of the 2MASS Declination (J2000)
39- 40 I2 deg DEd Degree of 2MASS Declination (J2000)
42- 43 I2 arcmin DEm Arcminute of 2MASS Declination (J2000)
45- 48 F4.1 arcsec DEs Arcsecond of 2MASS Declination (J2000)
50- 54 F5.2 mag Vmag ? V band magnitude (see "History" section below)
56- 59 F4.2 mag V-Ic ? (V-Ic) color index
61- 64 F4.2 mag sigV ? 1σ dispersion in the normalized
instrumental V band magnitudes
66- 70 F5.2 mag DelV ? Measured variations in the normalized
instrumental V band magnitudes
72- 73 A2 --- SpT Spectral type (2)
75- 81 F7.2 0.1nm W(Ha) ? Equivalent width of Hα in Angstroms
83- 86 F4.2 0.1nm W(LiI) ? Equivalent width of Li I (6707) in Angstroms
88 A1 --- Cl [CW] Classical or Weak T Tau type
91- 92 A2 --- OB [1abc] OB subassociation (1a, 1b or 1c)
94- 98 F5.2 mag Jmag ? 2MASS J band magnitude
100 A1 --- f_Jmag [34] Reason of missing Jmag (4)
102-105 F4.2 mag J-H ? 2MASS (J-H) color index
107 A1 --- f_J-H [34] Reason of missing J-H (4)
109-112 F4.2 mag H-K ? 2MASS (H-K) color index
114 A1 --- f_H-K [34] Reason of missing H-K (4)
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Note (1): Flag on CVSO, defined as follows:
1 = Star observed with the Hydra spectrograph;
2 = Pair not resolved in Quest photometry.
Note (2): Spectral type errors are 1-2 subclasses for stars with FAST
spectra and 2-3 subclasses for stars with Hydra spectra.
Note (4): Flag on Jmag, J-H, H-K, defined as follows:
3 = H and K bands are inconsistently deblended;
4 = J band is inconsistently deblended.
For 05415452-0143137: H=10.407±0.028 and K=10.161±0.032.
For 05415479-0143131: H=13.058±0.057 and K=12.328±0.042.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- CVSO [1/197] The CVSO number
5- 94 A90 --- OName Other names, separated by commas
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Byte-by-byte Description of file: table6.dat table7.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- CVSO [1/197] The CVSO running number
5 A1 --- f_CVSO [1] Double solution (1)
7- 10 I4 K Teff Stellar effective temperature
12- 15 F4.2 mag AV ? V band extinction
17- 20 F4.2 solLum Lum Stellar luminosity
22- 25 F4.2 solRad Rad ? Stellar radius
27- 30 F4.2 solMass M(B) ? Mass from Baraffe et al. 1998
(Cat. J/A+A/337/403)
32- 36 F5.2 Myr age(B) ? Age from Baraffe et al. (Cat. J/A+A/337/403)
38- 41 F4.2 solMass M(S) ? Mass from Siess et al. (2000A&A...358..593S 2000A&A...358..593S)
43- 47 F5.2 Myr age(S) ? Age from Siess et al. (2000A&A...358..593S 2000A&A...358..593S)
49- 52 A4 --- Cl Classical (CTTS) or Weak (WTTS) T Tauri class
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Note (1): "1" indicates that properties have been determined for each of
the two 2MASS counterparts using the corresponding J magnitude.
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History:
* 25-Aug-2005: From electronic version of the journal
* 11-Jun-2012: Fixed column "Vmag" in table3 for star CVSO 184:
replaced 85.57 by 15.57
References:
Briceno et al. Paper II. 2019AJ....157...85B 2019AJ....157...85B
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 25-Aug-2005