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Published October 1970 | Published
Journal Article Open

Nature of BD + 17° 4708


Oke, Greenstein, and Gunn (1966) called the GO star BD + 17° 4708 a field horizontal-branch star. They determined its effective temperature to be 6000° K, and its surface gravity as log g = 3.0. In his study of field horizontal-branch stars, Newell (1969) found + 17° 4708 to be the reddest such star, and it occupied a critical position in his plot of 0_e vs. log g, serving to separate more clearly the groups he calls disk horizontal-branch and halo horizontal-branch stars. It is the purpose ofthis note to indicate that + 17° 4708 is a G subdwarf, possibly slightly evolved, rather than a field horizontal-branch star.

Additional Information

© 1970. The Astronomical Society of the Pacific. Received June 4, 1970. We thank Professor Oke for the use of his scans, and for helpful discussion. We are grateful to Dr. Strom, Mr. Kurucz, and Dr. Peterson who wrote many of the computer programs used in this investigation. One of us (J.G.C.) gratefully acknowledges the support of a National Science Foundation traineeship.

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August 19, 2023
October 20, 2023