Spectra of the suspected two-hour variable UV-bright star in the X-ray globular cluster NGC 7078 /M15/

Details Spectra of the suspected two-hour variable UV-bright star in the X-ray globular cluster NGC 7078 /M15/ Spectra of the suspected two-hour variable UV-bright star in the X-ray globular cluster NGC 7078 /M15/

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pasp...91..358h&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 91, June-July 1979, p. 358-360.

Astronomy and Astrophysics

Astronomy

2

Globular Clusters, Stellar Spectra, Ultraviolet Astronomy, Variable Stars, X Ray Sources, Cepheid Variables, Image Tubes, Photographic Plates, Radial Velocity, Stellar Motions

Scientific paper

Image-tube spectra (61 Å mm-1) of the 15th magnitude UV-bright star M15-K1082 yield a radial velocity of -104 km sec-1. This result strongly supports the conclusion of Brown (1951) and Cudworth (1976), based on proper-motion measurements, that K1082 is a cluster member. According to the photographic photometry of Chu (1977), K1082 is a unique, ultra-short-period cluster variable. Smith, Millis, and Liller (1979) report weak evidence for variability on plates in the Yale collection, while failing to find it on 1978 plates taken for the purpose of studying K1082.

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