SIMBAD references

2014ApJS..213...34K - Astrophys. J., Suppl. Ser., 213, 34 (2014/August-0)

Toward complete statistics of massive binary stars: penultimate results from the Cygnus OB2 radial velocity survey.

KOBULNICKY H.A., KIMINKI D.C., LUNDQUIST M.J., BURKE J., CHAPMAN J., KELLER E., LESTER K., ROLEN E.K., TOPEL E., BHATTACHARJEE A., SMULLEN R.A., VARGAS ALVAREZ C.A., RUNNOE J.C., DALE D.A. and BROTHERTON M.M.

Abstract (from CDS):

We analyze orbital solutions for 48 massive multiple-star systems in the Cygnus OB2 association, 23 of which are newly presented here, to find that the observed distribution of orbital periods is approximately uniform in log P for P < 45 days, but it is not scale-free. Inflections in the cumulative distribution near 6 days, 14 days, and 45 days suggest key physical scales of ≃0.2, ≃0.4, and ≃1 A.U. where yet-to-be-identified phenomena create distinct features. No single power law provides a statistically compelling prescription, but if features are ignored, a power law with exponent β ≃ -0.22 provides a crude approximation over P = 1.4-2000 days, as does a piece-wise linear function with a break near 45 days. The cumulative period distribution flattens at P > 45 days, even after correction for completeness, indicating either a lower binary fraction or a shift toward low-mass companions. A high degree of similarity (91% likelihood) between the Cyg OB2 period distribution and that of other surveys suggests that the binary properties at P ≲ 25 days are determined by local physics of disk/clump fragmentation and are relatively insensitive to environmental and evolutionary factors. Fully 30% of the unbiased parent sample is a binary with period P < 45 days. Completeness corrections imply a binary fraction near 55% for P < 5000 days. The observed distribution of mass ratios 0.2 < q < 1 is consistent with uniform, while the observed distribution of eccentricities 0.1 < e < 0.6 is consistent with uniform plus an excess of e ≃ 0 systems. We identify six stars, all supergiants, that exhibit aperiodic velocity variations of ∼30 km/s attributed to atmospheric fluctuations.

Abstract Copyright:

Journal keyword(s): binaries: close - binaries: general - binaries: spectroscopic - stars: early-type - stars: kinematics and dynamics - stars: massive - techniques: radial velocities

VizieR on-line data: <Available at CDS (J/ApJS/213/34): table1.dat table7.dat table8.dat table9.dat apvar.dat>

Status at CDS : Objects in title, abstract, text, figures, and all or part of small table(s) being processed in SIMBAD.

Simbad objects: 96

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2022.08.11-22:08:44

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