On the suspected ultra-short-period variable in M15

Details On the suspected ultra-short-period variable in M15 On the suspected ultra-short-period variable in M15

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pasp...91..671s&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 91, Oct.-Nov. 1979, p. 671-673.

Astronomy and Astrophysics

Astronomy

2

Astronomical Photography, Globular Clusters, Hot Stars, Stellar Spectrophotometry, Variable Stars, Stellar Magnitude, Tables (Data), Variability, Visual Photometry

Scientific paper

The variability of the hot star K 1082 in the globular cluster M 15 is studied. The variation with a period of 0.087004 days and a full magnitude of 0.2 found by Chu (1977) on blue-sensitive plates taken in 1956 and 1957 was sought by iris photometer measurements of blue-sensitive plates taken in 1967, 1968 and 1972 and in 1978. The standard deviation of the magnitude of K 1082 is found to be significantly greater than that of the nearby star K 1073 in the 1967, 1968 and 1972 plates, appearing to confirm the variability of K 1082, however there is no evidence for a variation on the 1978 plate, which also showed a decrease in the magnitude of K 1082. Measurements of the brightness of K 1082 on plates taken between 1896 and 1906 with a 33-mm Boyden refractor provide strong evidence of no long-term variations of the star in this period, and plots of the 1967 to 1968 magnitudes against the relative phase of the period reported by Chu inconclusively suggest a fit of the data. Further observations to definitely determine the variability of K 1082 are urged.

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