A Search for New Binaries Among O-type Stars in Clusters

Details A Search for New Binaries Among O-type Stars in Clusters A Search for New Binaries Among O-type Stars in Clusters

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.propq..64m&link_type=abstract

NOAO Proposal ID #2000A-0064

Physics

Scientific paper

We are proposing here to look for new double-lined spectroscopic binaries among the most luminous and massive stars in three OB associations/clusters: Cyg OB2, IC 1805, and NGC 6611. These clusters contain stars whose evolutionary tracks would suggest masses as high as 120 M_&sun;, and discovering double-lined eclipsing systems among this sample would allow us to resolve whether stellar evolutionary models or stellar atmosphere models (or neither) yield the correct answers for the masses of massive stars. (The stellar evolutionary models are the basis for all estimates of the IMF for massive stars, and yet they predict masses that are 1.5-2.0× more than that inferred from model atmosphere analysis.) Given the relatively high frequency of binaries with short periods found for massive stars (40%) we expect to find about 20 systems suitable for follow-up studies. We were kindly granted WIYN time during 1999B. At this writing the WIYN queue has managed to obtain good coverage of Cyg OB2, some progress on IC1805, and minimal progress on NGC 6611. We are asking time here in order to obtain additional data (if needed) on IC 1805 in Feburary, and to make a new effort on NGC 6611 during the summer. We are also asking for very short images (2 sec) to be obtained in order to check for photometric variability of our candidate massive binaries.

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