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HD137569, a Population II Remnant of Mass Exchange Evolution

Published online by Cambridge University Press:  14 August 2015

C. T. Bolton  and
J. R. Thomson
C. T. Bolton
Affiliation:
David Dunlap Observatory, University of Toronto P.O. Box 360, Richmond Hill, Ontario, CANADA L4C 4Y6
J. R. Thomson
Affiliation:
David Dunlap Observatory, University of Toronto P.O. Box 360, Richmond Hill, Ontario, CANADA L4C 4Y6

Extract

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The temperature, surface gravity, and abundances derived for this halo B star by Danziger and Jura (1970, Ap.J., 161, 997) show that it is a field suprahorizontal branch star very similar to B29 in M13. The only difference is that HD137569 has a higher (solar) C abundance. We find that HD137569 is a spectroscopic binary with P=529.8(2) days, Vo=45.0(2) km/s, K=16.2(3) km/s, e=0.12(2), ω=233°(10), and T=JD2441922(14). The parenthesized quantities are the uncertainties (probable errors) of the last digits of the elements.

Type
X. … and The Rest (Symbiotics, Supergiants, Planetaries, Population II Systems)
Information
Symposium - International Astronomical Union , Volume 88: Close Binary Stars: Observations and Interpretation , 1980 , pp. 575
Copyright
Copyright © Reidel 1980