ADDITIONAL MASSIVE BINARIES IN THE CYGNUS OB2 ASSOCIATION

被引：28
作者：
Kiminki, Daniel C. [1 ,2 ]
Kobulnicky, Henry A. [1 ]
Ewing, Ian [1 ]
Kiminki, Megan M. Bagley [2 ]
Lundquist, Michael [1 ]
Alexander, Michael [1 ]
Vargas-Alvarez, Carlos [1 ]
Choi, Heather [1 ]
Henderson, C. B. [3 ]
机构：
[1] Univ Wyoming, Dept Phys & Astron, Laramie, WY 82070 USA
[2] Univ Arizona, Dept Astron, Tucson, AZ 85721 USA
[3] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA
来源：
ASTROPHYSICAL JOURNAL | 2012年 / 747卷 / 01期
基金：
美国国家科学基金会;
关键词：
binaries: close; binaries: general; binaries: spectroscopic; stars: early-type; stars: kinematics and dynamics; surveys; techniques: radial velocities; YOUNG OPEN CLUSTERS; GALACTIC O-STARS; SPECTRAL CLASSIFICATION; PHOTOMETRIC VARIABILITY; GALAXY; FRACTION;
D O I：
10.1088/0004-637X/747/1/41
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report the discovery and orbital solutions for two new OB binaries in the Cygnus OB2 Association, MT311 (B2V + B3V) and MT605 (B0.5V + B2.5:V). We also identify the system MT429 as a probable triple system consisting of a tight eclipsing 2.97 day B3V+B6V pair and a B0V at a projected separation of 138 AU. We further provide the first spectroscopic orbital solutions to the eclipsing, double-lined, O-star binary MT696 (O9.5V + B1:V), the double-lined, early B binary MT720 (B0-1V + B1-2V), and the double-lined, O-star binary MT771 (O7V + O9V). These systems exhibit orbital periods between 1.5 days and 12.3 days, with the majority having P <6 days. The two new binary discoveries and six spectroscopic solutions bring the total number of known massive binaries in the central region of the Cygnus OB2 Association to 20, with all but two having full orbital solutions.
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页数：16
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