J/A+A/550/A27 Cygnus OB1-OB4 O stars radial velocities (Mahy+, 2013)
A spectroscopic investigation of the O-type star population in four Cygnus OB
associations. I. Determination of the binary fraction.
Mahy L., Rauw G., De Becker M., Eenens P., Flores. C.A.
<Astron. Astrophys. 550, A27 (2013)>
=2013A&A...550A..27M 2013A&A...550A..27M
ADC_Keywords: Associations, stellar ; Stars, O ; Radial velocities
Keywords: stars: early-type - stars: binaries: spectroscopic -
open clusters and associations: individual: Cygnus OB1 -
open clusters and associations: individual: Cygnus OB3 -
open clusters and associations: individual: Cygnus OB8 -
open clusters and associations: individual: Cygnus OB9
Abstract:
Establishing the multiplicity of O-type stars is the first step
towards accurately determining their stellar parameters. Moreover, the
distribution of the orbital parameters provides observational clues to
the way that O-type stars form and to the interactions during their
evolution.
Our objective is to constrain the multiplicity of a sample of O-type
stars belonging to poorly investigated OB associations in the Cygnus
complex and for the first time to provide orbital parameters for
binaries identified in our sample. Such information is relevant to
addressing the issue of the binarity in the context of O-type star
formation scenarios.
Description:
We performed a long-term spectroscopic survey of nineteen O-type
stars. We searched for radial velocity variations to unveil binaries
on timescales from a few days up to a few years, on the basis of a
large set of optical spectra.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 47 19 List of studied stars (added by CDS)
table2.dat 96 347 The radial velocities of the strongest lines
measured for each star from the observed spectra
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See also:
J/A+A/543/A101 : OB stars in Cygnus OB2 association (Comeron+, 2012)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [HD]
4- 9 I6 --- HD HD star number
12- 13 I2 h RAh Simbad Hour of Right Ascension (J2000.0)
15- 16 I2 min RAm Simbad Minute of Right Ascension (J2000.0)
18- 22 F5.2 s RAs Simbad Second of Right Ascension (J2000.0)
24 A1 --- DE- Simbad Sign of the Declination (J2000.0)
25- 26 I2 deg DEd Simbad Degree of Declination (J2000.0)
28- 29 I2 arcmin DEm Simbad Arcminute of Declination (J2000.0)
31- 34 F4.1 arcsec DEs Simbad Arcsecond of Declination (J2000.0)
36- 38 A3 --- Cyg Cygnus OB association: OB1, OB3, OB8 or OB9
41- 47 F7.5 d Per ? Period for new binary systems (from table3)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [HD]
4- 9 I6 --- HD HD star number
11 A1 --- m_HD [PS] SB2 systems, "P" for primary and
"S" for secondary
13- 21 F9.4 d HJD Heliocentric Julian date (HJD-2450000)
24- 29 F6.1 km/s HeI4471 ?=- Doppler shift measured on HeIλ4471
32- 37 F6.1 km/s HeII4542 ?=- Doppler shift measured on HeIλI4542
40- 44 F5.1 km/s NIII4634 ?=- Doppler shift measured on NIIIλ4634
47- 51 F5.1 km/s NIII4641 ?=- Doppler shift measured on NIIIλ4641
53- 58 F6.1 km/s HeII4686 ?=- Doppler shift measured on HeIIλ4686
61- 66 F6.1 km/s HeI4713 ?=- Doppler shift measured on HeIλ4713
69- 74 F6.1 km/s HeI5876 ?=- Doppler shift measured on HeIλ5876
78- 82 F5.1 km/s NaI5889 ?=- Doppler shift measured on NaIλ5889
85- 89 F5.1 km/s NaI5895 ?=- Doppler shift measured on NaIλ5895
91- 96 F6.1 km/s RV ? Radial velocity computed by the
disentangling programme
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Acknowledgements:
Laurent Mahy, mahy(at)astro.ulg.ac.be
(End) Patricia Vannier [CDS] 11-Dec-2012