New variable stars in the globular cluster M4

Details New variable stars in the globular cluster M4 New variable stars in the globular cluster M4

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987msngr..50...33y&link_type=abstract

ESO Messenger (ISSN 0722-6691), Dec. 1987, v. 50, p. 33-37.

Other

11

Globular Clusters, Red Giant Stars, Variable Stars, Color-Magnitude Diagram, Stellar Spectrophotometry

Scientific paper

The DAOPHOT program was used to study the globular cluster M4 in order to confirm previous observations of variability made by photographic methods. A variable star with periodicity in the middle part of the red giant branch (RGB) was observed. Three other variables may be members of a new subgroup of RR Lyrae stars in globular clusters. Another star is found to be located at the intersection of the RGB and the horizontal branch.

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