UBV stellar photometry of bright stars in GC M5 – II. Physical parameters of horizontal branch stars期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

UBV stellar photometry of bright stars in GC M5 – II. Physical parameters of horizontal branch stars

Authors:	P.V. Baev H. Markov N. Spassova

Affiliation:	¹Merrowinger str. 10, D-40223 Düsseldorf, Germany;²National Astronomical Observatory 'Rozhen', Institute of Astronomy, Bulgarian Academy of Sciences, PO Box 136, BG-4700 Smoljan, Bulgaria;³Institute of Astronomy, Bulgarian Academy of Sciences, 72 Tsarigradsko ch., BG-1784 Sofia, Bulgaria

Abstract:	The physical parameters of the stars in the central region of the globular cluster M5 (NGC 5904) were determined from UBV photometry using Kurucz's synthetic flux distributions and some empirical relations. It is found that the bluest horizontal branch (HB) stars have higher luminosities than predicted by canonical zero-age horizontal branch models. Parameters of the mass distribution on the HB stars are determined. It is shown that the gap in the blue HB previously reported by Markov et al. in Paper I is probably a statistical fluctuation.

Keywords:	stars: evolution stars: horizontal branch stars: Population II globular clusters: general globular clusters: individual: eqmu1" alt=" " > 5904