2009PASP..121.1307A


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.16CET10:56:03

2009PASP..121.1307A - Publ. Astron. Soc. Pac., 121, 1307-1311 (2009/December-0)

Stellar rotation versus duplicity in open cluster early-type stars.

ABT H.A.

Abstract (from CDS):

We considered 17 open clusters for which published radial velocities studies have been made to search for spectroscopic binaries among the brighter stars. They have log ages of 6.7 to 8.9, with mostly B stars. Some clusters such as the Pleiades have mostly broad-lined stars, indicating large rotational velocities and few binaries, while clusters such as NGC 6475 have many narrow-lined stars and many binaries. We confirm with this larger sample the previous evidence of an inverse correlation between mean cluster rotational velocity and duplicity. It is not due to measuring errors or to preferred orientations of rotational axes in some clusters. Samples of field stars, such as Am and B2-B5, that have been observed enough to determine their duplicities, also fall on the same correlation. Not only are there large differences in the fractions of binaries, but in the clusters with many binaries, 25% of the stars have orbital periods days while in the clusters with few binaries, only 4% have periods days. We wonder why some clusters developed many binaries and other did not. There is marginal evidence that currently the denser clusters have more binaries and with shorter binary periods, but we do not know the initial cluster densities when the binaries were formed.

Abstract Copyright:

Journal keyword(s): Star Clusters and Associations

Simbad objects: 20

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Number of rows : 20

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 Cl Melotte 20 OpC 03 26 42 +48 48.0           ~ 743 0
2 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2917 0
3 V* V1229 Tau Al* 03 47 29.4535999265 +24 17 18.016988974   6.87 6.81   6.74 A0VpSi+Am 170 0
4 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2588 0
5 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1912 1
6 M 42 HII 05 35 17.3 -05 23 28           ~ 3665 0
7 NGC 2516 OpC 07 58 04 -60 45.2           ~ 576 0
8 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1184 0
9 IC 2391 OpC 08 40 32 -53 02.0           ~ 705 0
10 IC 2602 OpC 10 42 58 -64 24.0           ~ 541 0
11 Cl Trumpler 14 OpC 10 43 56 -59 33.0   5.70 5.5     ~ 414 0
12 Cl Collinder 228 OpC 10 44 00 -60 05.2   4.58 4.4     ~ 184 0
13 Cl Trumpler 16 OpC 10 45 10 -59 43.0   5.35 5.0     ~ 415 0
14 Cl Melotte 111 OpC 12 25 06.00 +26 06 00.0           ~ 396 0
15 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4114 2
16 NGC 6193 OpC 16 41 20 -48 45.8           ~ 130 0
17 NGC 6231 OpC 16 54 08.51 -41 49 36.0   2.83 2.6     ~ 475 0
18 IC 4665 OpC 17 46 18 +05 43.0           ~ 307 0
19 NGC 6475 OpC 17 53 51 -34 47.6           ~ 329 0
20 NGC 7092 OpC 21 31 48 +48 26.0           ~ 185 0

    Equat.    Gal    SGal    Ecl

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2019.12.16-10:56:03

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