Long-term variability in two remarkable members and X-ray sources of M 67

Details Long-term variability in two remarkable members and X-ray sources of M 67 Long-term variability in two remarkable members and X-ray sources of M 67

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003noao.prop..281o&link_type=abstract

NOAO Proposal ID #2003A-0281

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Scientific paper

We propose to obtain BVIJK light curves for two remarkable members and X-ray sources of the old open cluster M 67. Our main target is the single-lined eccentric binary S 1063 with an orbital period of 18.4 d, whose position in the color-magnitude diagram below the giant branch is unexplained. Its colors suggest a reddening significantly larger than expected for M 67 members. Its light curves show variations on a time scale longer than the orbital period. With the proposed observations we will be able to (i) study better the light curve variations and (ii) look for signatures of the enhanced reddening in the infrared. Near S 1063 lies another peculiar system whose light curve can be easily obtained with the same data. The yellow straggler S 1040 is a binary consisting of a giant and a white dwarf. More light curves can help to study the observed photometric variability near the spectroscopic period of 42 d. In addition, we propose to monitor S1063 with the HET to study its complex H(alpha) profile. In as far as we understand them, these stars provide direct clues to the various types of stellar interaction that occur in star clusters, which is our main reason for studying them. The queue-schedules of the 1.3m and the HET are especially suited to investigate these long-time-scale variables.

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