Open AccessUBV stellar photometry of bright stars in GC M5 – II.
Physical parameters of horizontal branch stars
Author(s) -
Baev P.V.,
Markov H.,
Spassova N.
Publication year - 2001
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2001.04920.x
Subject(s) - physics , stars , photometry (optics) , astrophysics , globular cluster , horizontal branch , blue straggler , astronomy , star count , star cluster , hertzsprung–russell diagram , stellar evolution , k type main sequence star , t tauri star
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.