J/ApJ/664/1102 Radial velocity survey of Cyg OB2 association (Kiminki+, 2007)
A radial velocity survey of the Cyg OB2 association.
Kiminki D.C., Kobulnicky H.A., Kinemuchi K., Irwin J.S., Fryer C.L.,
Berrington R.C., Uzpen B., Monson A.J., Pierce M.J., Woosley S.E.
<Astrophys. J., 664, 1102-1120 (2007)>
=2007ApJ...664.1102K 2007ApJ...664.1102K
ADC_Keywords: Associations, stellar ; Stars, early-type ; Radial velocities
Keywords: binaries: close - binaries: general - binaries: spectroscopic -
stars: early-type - stars: kinematics - surveys -
techniques: radial velocities
Abstract:
We conducted a radial velocity survey of the Cyg OB2 association over
a 6yr (1999-2005) time interval to search for massive close binaries.
During this time we obtained 1139 spectra on 146 OB stars to measure
mean systemic radial velocities and radial velocity variations. We
spectroscopically identify 73 new OB stars for the first time, the
majority of which are likely to be association members.
Description:
Between 1999 July and 2005 October we observed 183 stars in the
direction of the Cyg OB2 association with the echelle spectrographs at
the Lick 3m and Keck 10m telescopes, the Hydra spectrograph at the
WIYN 3.5m telescope, the Wyoming Infrared Observatory (WIRO)
fiber-bundle spectrograph (WIRO-Spec), and the WIRO-Longslit
spectrograph at the WIRO 2.3m telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 115 146 Early type stars in the direction of Cyg OB2
table3.dat 39 37 Non-OB Stars
table4.dat 32 907 Complete table of observations and radial velocities
table5.dat 58 120 Derived radial velocity parameters
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See also:
J/AJ/101/1408 : Massive stars in Cyg OB2 (Massey+ 1991)
J/ApJS/184/84 : Massive Star Forming Region Cygnus OB2 (Wright+, 2009)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- [MT91] Star designation from Massey & Thompson
(1991, Cat. J/AJ/101/1408)
5- 12 A8 --- SpTypL Spectral classification from literature
14- 23 A10 --- SpType Spectral classification from this work
25- 26 I2 h RAh Hour of Right Ascension (J2000)
28- 29 I2 min RAm Minute of Right Ascension (J2000)
31- 35 F5.2 s RAs Second of Right Ascension (J2000)
37 A1 --- DE- Sign of the Declination (J2000)
38- 39 I2 deg DEd Degree of Declination (J2000)
41- 42 I2 arcmin DEm Arcminute of Declination (J2000)
44- 47 F4.1 arcsec DEs Arcsecond of Declination (J2000)
49- 52 F4.1 mag AV Calculated visual extinction (1)
54- 58 F5.2 mag Vmag Massey & Thompson (1991, J/AJ/101/1408)
V band magnitude
60- 64 F5.2 mag VMAG Absolute V band magnitude (2)
66- 69 F4.2 mag (B-V) Massey & Thompson (1991, J/AJ/101/1408)
measured (B-V) color index
71- 75 F5.2 mag (B-V)0 Wegner (1994MNRAS.270..229W 1994MNRAS.270..229W) intrinsic (B-V)
color index
77- 80 F4.1 solMass MPD Initial mass (4)
82- 86 F5.1 solMass M0 Current mass (3)
88- 91 F4.1 mag DM True distance modulus
93- 95 A3 --- Note Additional note (5)
97-113 A17 --- PAct Photometric activity found in literature
115 A1 --- r_PAct Reference for PAct (6)
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Note (1): Calculated visual extinction in magnitudes using Massey &
Thompson (1991, Cat. J/AJ/101/1408) colors, Wegner
(1994MNRAS.270..229W 1994MNRAS.270..229W) intrinsic colors, and RV=3.0.
Note (2): from Humphreys & McElroy (1984ApJ...284..565H 1984ApJ...284..565H) (B stars) and
Martins et al. (2005A&A...436.1049M 2005A&A...436.1049M) (O stars)
Note (3): Initial masses interpolated from the stellar evolutionary models
of Lejeune & Schaerer (2001, cat. VI/102)
Note (4): Current masses from Martins et al. (2005A&A...436.1049M 2005A&A...436.1049M) and
Drilling & Landolt (2000, in Astrophysical Quantities, p. 381).
Note (5): Note as follows:
n = new early-type classification
b = a close visual double, unresolved in our data
Note (6): Literature reference for photometric activity as follows:
1 = Kukarkin & Kholopov, 1982, Cat. II/140
2 = Pigulski & Kolaczkowski, 1998, Cat; J/MNRAS/298/753
3 = Romano, 1969MmSAI..40..375R 1969MmSAI..40..375R
4 = Rios & DeGioia-Eastwood, 2004AAS...205..905R 2004AAS...205..905R
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- [MT91] Star designation from Massey & Thompson
(1991, Cat. J/AJ/101/1408)
5- 6 I2 h RAh Hour of Right Ascension (J2000)
8- 9 I2 min RAm Minute of Right Ascension (J2000)
11- 15 F5.2 s RAs Second of Right Ascension (J2000)
17 A1 --- DE- Sign of the Declination (J2000)
18- 19 I2 deg DEd Degree of Declination (J2000)
21- 22 I2 arcmin DEm Arcminute of Declination (J2000)
24- 27 F4.1 arcsec DEs Arcsecond of Declination (J2000)
29- 33 F5.2 mag Vmag Massey & Thompson (1991, J/AJ/101/1408)
V band magnitude
35- 39 A5 --- SpType Spectral classification
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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 --- [MT91] Star designation from Massey & Thompson
(1991, Cat. J/AJ/101/1408)
5- 16 F12.4 d HJD Heliocentric Julian date of the observation
18- 25 F8.3 km/s HRV Heliocentric radial velocity
27- 32 F6.3 km/s e_HRV The 1σ uncertainty on HRV
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [MT91] Star designation from Massey & Thompson
(1991, Cat. J/AJ/101/1408)
5- 11 A7 --- SpType Spectral classification as determined/accepted
by this survey
13- 14 I2 --- Nobs Number of usable observations
16- 21 F6.2 km/s Vavg Weighted average heliocentric velocity
23- 27 F5.1 km/s Vmid Simple average of the largest and smallest
observed heliocentric velocity
29- 32 F4.1 km/s Vh Measure of the velocity semiamplitude
34- 37 F4.1 km/s Vrms rms heliocentric velocity dispersion of all
observations
39- 42 F4.1 km/s e_Vavg Mean velocity uncertainty, averaged over all
observations
44- 48 F5.3 -- Prob Probability that χ2 would be exceeded by
chance, given {vu}=Nobs-1 degrees of freedom
50- 57 A8 --- Bin Binarity (1)
58 A1 --- n_Bin [ab] note on type (2)
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Note (1): Spectroscopic activity as follows:
SB1 = probable single-lined variability [P≤0.01]
SB1? = possible single-lined variability [0.01<P≤0.04]
SB2? = possible double-lined binary signature
SB2 = definite double-lined signature
Note (2): Note as follows:
a = Spectroscopic period of P=21.908days (De Becker et al.
2004A&A...424L..39D 2004A&A...424L..39D)
b = Photometric period of P=1.46days (Rios & DeGioia-Eastwood,
2004AAS...205..905R 2004AAS...205..905R)
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History:
From electronic version of the journal
References:
Kiminki et al. Paper II. 2008ApJ...679.1478K 2008ApJ...679.1478K
Kiminki et al. Paper III. 2009AJ....137.4608K 2009AJ....137.4608K
Kiminki et al. Paper IV. 2012ApJ...747...41K 2012ApJ...747...41K
Kiminki et al. Paper V. 2012ApJ...751....4K 2012ApJ...751....4K Cat. J/ApJ/751/4
Kobulnicky et al. Paper VI. 2012ApJ...756...50K 2012ApJ...756...50K
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 29-Aug-2009