SIMBAD references

2008MNRAS.386..447S - Mon. Not. R. Astron. Soc., 386, 447-460 (2008/May-1)

The massive star binary fraction in young open clusters - I. NGC 6231 revisited.

SANA H., GOSSET E., NAZE Y., RAUW G. and LINDER N.

Abstract (from CDS):

We present the results of a long-term high-resolution spectroscopy campaign on the O-type stars in NGC 6231. We revise the spectral classification and multiplicity of these objects and we constrain the fundamental properties of the O-star population. Almost three quarters of the O-type stars in the cluster are members of a binary system. The minimum binary fraction is 0.63, with half the O-type binaries having an orbital period of the order of a few days. The eccentricities of all the short-period binaries are revised downward, and henceforth match a normal period-eccentricity distribution. The mass ratio distribution shows a large preference for O + OB binaries, ruling out the possibility that, in NGC 6231, the companion of an O-type star is randomly drawn from a standard initial mass function. Obtained from a complete and homogeneous population of O-type stars, our conclusions provide interesting observational constraints to be confronted with the formation and early evolution theories of O-stars.

Abstract Copyright: ©2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): binaries: close - binaries: general - binaries: spectroscopic - stars: early-type - open clusters and associations: individual: NGC 6231 - open clusters and associations: individual: Sco OB1

VizieR on-line data: <Available at CDS (J/MNRAS/386/447): table3m.dat table3d.dat>

Simbad objects: 22

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2019.12.12-17:07:52

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