Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97.1710l&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, June 1989, p. 1710-1715.
Astronomy and Astrophysics
Astronomy
12
Binary Stars, Giant Stars, Main Sequence Stars, Open Clusters, Stellar Spectrophotometry, Color-Magnitude Diagram, Radial Velocity, Stellar Mass, Stellar Orbits
Scientific paper
Two single-lined spectroscopic binaries, MPS 926 and MPS 1223, have been identified among 30 giants surveyed in the open cluster M11. MPS 926 has a circular orbit with a period of 210 days; MPS 1223 has a highly eccentric orbit with a period of 660 days. Both binaries are bluer than the remaining giants, and are interpreted as having giant primaries and main-sequence secondaries. For each binary, the photometrically permitted secondary mass range is combined with the dynamical lower limit set by the orbit to constrain the secondary mass. This analysis also places a lower limit on the cluster distance modulus of m-M = 12.7. This limit would be relaxed if the secondary of MPS 926 were itself a binary.
Latham David W.
Lee Chang Won
Mathieu Robert D.
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