2015A&A...581A..37L


Query : 2015A&A...581A..37L

2015A&A...581A..37L - Astronomy and Astrophysics, volume 581A, 37-37 (2015/9-1)

Period change of massive binaries from combined photometric and spectroscopic data in Cygnus OB2.

LAUR J., TEMPEL E., TUVIKENE T., EENMAEE T. and KOLKA I.

Abstract (from CDS):

Mass loss is an important property in evolution models of massive stars. As up to 90% of the massive stars have a visual or spectroscopic companion and many of them exhibit mass exchange, mass-loss rates can be acquired through studying the period of massive binaries. Using our own photometric observations as well as archival data, we searched for variations in orbital periods of seven massive eclipsing binary systems in the Cygnus OB2 association and estimated their mass-loss rates and stellar parameters. We used a Bayesian parameter estimation method to simultaneously fit the period and period change to all available data and a stellar modelling tool to model the binary parameters from photometric and radial-velocity data. Four out of the seven selected binaries show non-zero period change values at two-sigma confidence level. We also report the eclipsing nature of the star MT059 for the first time.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - stars: mass-loss - open clusters and associations: individual: Cygnus OB2 - stars: massive

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME Cyg X Cld 20 30 04.7973633 +40 51 36.002197           ~ 828 1
2 V* V1827 Cyg s*b 20 30 27.3018237840 +41 13 25.130220744     13.053     O6Iaf+O9Ia 36 0
3 Schulte 1 SB* 20 31 10.544472 +41 31 53.52024 12.82 12.69 11.09 10.57   O8V+B 64 0
4 BD+40 4212 SB* 20 31 37.5053189952 +41 13 21.001757520 12.46 11.5 10.214     O6IV:+O9III 79 1
5 BD+40 4220 s*b 20 32 22.4238071594 +41 18 18.942475904 11.32 10.61 9.185     O7Iafep 397 0
6 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 938 0
7 Schulte 27 SB* 20 33 59.5281120792 +41 17 35.477936340 14.44 13.97 12.203   10.250 O9.7V(n)+O9.7V(n) 50 0
8 RLP 814 SB* 20 34 06.0155486352 +41 08 09.132034596 16.37 15.64 13.415     B0-B1+B1-B2 30 0
9 V* V2550 Cyg SB* 20 34 58.7802708120 +41 36 17.359091316   13.591 11.470 10.671   B0Ib+B0III 29 0

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