J/AJ/133/1092 vsini of B0-B3 stars in 7 young clusters (Wolff+, 2007)
Rotational velocities for B0-B3 stars in seven young clusters: further study of
the relationship between rotation speed and density in star-forming regions.
Wolff S.C., Strom S.E., Dror D., Venn K.
<Astron. J., 133, 1092-1103 (2007)>
=2007AJ....133.1092W 2007AJ....133.1092W
ADC_Keywords: Clusters, open ; Stars, B-type ; Rotational velocities
Keywords: open clusters and associations: individual (NGC 6823, NGC 7380,
IC 1805, NGC 2244, NGC 6611, Cygnus OB2, I Lacerta, Scorpius OB2,
Orion I) - stars: rotation
Abstract:
We present the results of a study aimed at assessing the differences
in the distribution of rotation speeds N(vsini) among young (1-15Myr)
B stars spanning a range of masses 6M☉<M<12M☉ and located
in different environments: seven low-density (ρ<1M☉/pc3)
ensembles that are destined to become unbound stellar associations,
and eight high-density (ρ≫1M☉/pc3) ensembles that will
survive as rich, bound stellar clusters for ages well in excess of
108yr.
Description:
The B stars for which we obtained new spectroscopic observations were
members of NGC 6823, NGC 7380, IC 1805, NGC 2244, NGC 6611, and Cyg
OB2. For NGC 6611 only, observations were obtained in 2005 May, with
the Hydra multiobject fiber spectrograph on WIYN. For many of the same
stars in NGC 6611 and for the stars in the other associations, we
obtained WIYN Hydra observations that cover the wavelength range
4070-4580Å at a resolution of R∼5000(0.75Å).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 68 123 Stellar Data
table2.dat 18 143 Data for Stellar Associations
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See also:
J/AJ/101/1408 : Massive stars in Cyg OB2 (Massey+ 1991)
J/ApJ/454/151 : OB Associations of the Northern Milky Way (Massey+ 1995)
J/ApJ/648/580 : Rotational velocities in 19 open clusters (Huang+, 2006)
J/A+A/457/265 : The VLT-FLAMES Survey of Massive Stars (Dufton+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Cluster Cluster identification (1)
10- 13 A4 --- WEBDA The WEBDA identification in Cluster
15- 16 I2 h RAh Hour of Right Ascension (J2000)
18- 19 I2 min RAm Minute of Right Ascension (J2000)
21- 25 F5.2 s RAs Second of Right Ascension (J2000)
27 A1 --- DE- Sign of the Declination (J2000)
28- 29 I2 deg DEd Degree of Declination (J2000)
31- 32 I2 arcmin DEm Arcminute of Declination (J2000)
34- 37 F4.1 arcsec DEs Arcsecond of Declination (J2000)
39- 45 A7 --- SpType MK Spectral type
47- 51 F5.2 mag Vmag ? The V band magnitude
53- 56 F4.2 mag B-V ? The (B-V) color index
58- 62 F5.2 mag U-B ? The (U-B) color index
64- 66 I3 km/s vsini The vsin(i) rotational velocity
68 I1 --- r_vsini ? Reference for vsini (2)
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Note (1): Identification numbers for Cyg OB2 are from
Massey and Thompson (1991, Cat. J/AJ/101/1408)
Note (2): References as follows:
1 = Huang & Gies (2006, Cat. J/ApJ/648/580)
2 = Dufton et al. (2006, Cat. J/A+A/457/265)
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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- 7 A7 --- Assoc Association
9- 14 I6 --- HD The HD number
16- 18 I3 km/s vsini The vsin(i) rotational velocity
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 09-Jan-2009