Open AccessTwo extreme contact binary systems in the nearest globular cluster M4
Author(s) -
Liu L.,
Qian S.B.,
FernándezLajús E.
Publication year - 2011
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 - 10.1111/j.1365-2966.2011.18791.x
Subject(s) - globular cluster , physics , blue straggler , mass ratio , contact binary , astrophysics , cluster (spacecraft) , light curve , binary number , binary star , stars , arithmetic , mathematics , computer science , programming language
We present the results of photometric solutions for two contact binaries in the nearby globular cluster M4. We estimate their physical parameters using the light‐curve program of the Wilson–Devinney code. These systems have quite different mass ratios, which indicates that they did not form at the same time. V47 is an extreme mass‐ratio system ( q = 0.123 ± 0.002) being dissimilar to the same kind of field contact binaries. V53 is a high mass‐ratio ( q = 1.230 ± 0.004), deep‐contact ( f = 79.7 ± 1.9 per cent) system. It is also a blue straggler.