The eclipsing, double-lined, Of supergiant binary Cygnus OB2-B17

Stroud, V. E.; Clark, J. S.; Negueruela, I.; Roche, P.; Norton, A. J.; Vilardell, F.

doi:10.1051/0004-6361/200912123

Cited by 24 publications

(18 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, there are not many systems with a pair of massive evolved O-stars. Closer analogs are the Cyg OB2-B17 system (Stroud et al 2010), where the component stars are O7 and O9 supergiants and Cyg OB2-#5 where one of the stars is an O6-7 supergiant (Rauw et al 1999). It would appear that neither of these systems contain stars as massive as those predicted here.…”

Section: Discussionmentioning

confidence: 69%

The VLT-FLAMES Tarantula Survey

Taylor

Evans²,

Sana³

et al. 2011

A&A

Self Cite

View full text Add to dashboard Cite

We report the discovery that R139 in 30 Doradus is a massive spectroscopic binary system. Multi-epoch optical spectroscopy of R139 was obtained as part of the VLT-FLAMES Tarantula Survey, revealing a double-lined system. The two components are of similar spectral types; the primary exhibits strong C III λ4650 emission and is classified as an O6.5 Iafc supergiant, while the secondary is an O6 Iaf supergiant. The radial-velocity variations indicate a highly eccentric orbit with a period of 153.9 days. Photometry obtained with the Faulkes Telescope South shows no evidence for significant variability within an 18 month period. The orbital solution yields lower mass limits for the components of M 1 sin 3 i = 78 ± 8 M and M 2 sin 3 i = 66 ± 7 M . As R139 appears to be the most massive binary system known to contain two evolved Of supergiants, it will provide an excellent test for atmospheric and evolutionary models.

show abstract

Section: Discussionmentioning

confidence: 69%

The VLT-FLAMES Tarantula Survey

Taylor

Evans²,

Sana³

et al. 2011

A&A

Self Cite

View full text Add to dashboard Cite

show abstract

“…MT91 267 and MT91 417B, described in Section 3.4, constitute two of these. The double-lined system CPR2002 B17 was reported and analyzed by Stroud et al (2010). Schulte #5 has been known as a binary since Wilson (1948).…”

Section: Discussion and Analysis Of The Orbitalmentioning

confidence: 99%

Toward Complete Statistics of Massive Binary Stars: Penultimate Results From the Cygnus Ob2 Radial Velocity Survey

Kobulnicky

Kiminki

Lundquist

et al. 2014

ApJS

278

319

View full text Add to dashboard Cite

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 −1 attributed to atmospheric fluctuations.

show abstract

“…Davies et al 2007) and massive evolved stars with nebulae (Gvaramadze et al 2010, Wachter et al 2010. (Stroud et al 2010) satisfy these accuracy requirements, bringing the total to 16.…”

Section: Motivationmentioning

confidence: 99%

“…Bonanos (2009) compiled a list of the most massive stars accurately measured in eclipsing binary systems and found only 14 stars above 30 M with mass and radius measurements accurate to 10% or better (see Figure 1). Since this compilation, measurements of only 2 more massive stars (Stroud et al 2010) satisfy these accuracy requirements, bringing the total to 16. Therefore the need for accurate fundamental parameters of very massive stars at a range of metallicities and evolutionary phases remains of primary importance.…”

Section: Motivationmentioning

confidence: 99%