Optical and ultraviolet observations of the X-ray globular cluster BO 158 in M31

Details Optical and ultraviolet observations of the X-ray globular cluster BO 158 in M31 Optical and ultraviolet observations of the X-ray globular cluster BO 158 in M31

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.176..525c&link_type=abstract

In its 3rd European IUE Conf. p 525-528 (SEE N83-11889 02-88)

Physics

Andromeda Galaxy, Globular Clusters, Optical Emission Spectroscopy, Ultraviolet Spectra, X Ray Sources, Horizontal Branch Stars, Iue, Parameter Identification, Populations, Spectral Energy Distribution, Stellar Luminosity

Scientific paper

Medium resolution optical spectra, two IUE low resolution ultraviolet spectra, and optical data were used to determine the population content of Bo 158. Optical, UV and X-ray fluxes are all consistent with those derived for the X-ray globulars in the Galaxy. The ratio of the fluxes at 3000 and 1500 A suggests for Bo 158 a morphology of the HR diagram with an extremely blue horizontal branch. However, the values for metallicity and intrinsic color suggest a red horizontal branch. This discrepancy may indicate that the second parameter phenomenon is present among M31 globular clusters.

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