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Subluminous Stars in the HR Diagram

Published online by Cambridge University Press:  14 August 2015

C. C. Dahn  and
R. S. Harrington
C. C. Dahn
Affiliation:
U. S. Naval Observatory
R. S. Harrington
Affiliation:
U. S. Naval Observatory

Extract

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Eggen (1969) has defined a subluminous star “… as one that is fainter by at least a factor of 10 in visual luminosity than the main sequence stars of the same(U-V).” Implicit is the suggestion that single stars might exist in the region of the HR diagram between the subdwarfs and the normal degenerate sequence. While the evolutionary calculations of Chin and Stothers (1971) indicate that stars with masses <0.2 M⊙ will pass through this region following the completion of nuclear burning, these models have not yet been confirmed. We summarize Naval Observatory astrometry and photometry as it pertains to the existence of such stars.

Type
Part III: HR Diagrams, Subluminous Stars
Information
Symposium - International Astronomical Union , Volume 80: The HR Diagram , 1978 , pp. 129 - 132
Copyright
Copyright © Reidel 1978 

References

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Luyten, W. J. (1957). A Catalogue of 9867 Stars in the Southern Hemisphere with Proper Motions Exceeding 0″2 Annually, Lund Press, Minneapolis.Google Scholar
van Altena, W. F. (1969). Astron. J. 74, 2.Google Scholar