Other
Scientific paper
Jan 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007acasn..48...18y&link_type=abstract
Acta Astronomica Sinica, vol. 48, no. 1, p. 18-21
Other
Stars: Variables, Stars: Late-Type, Globular Clusters: M4
Scientific paper
A66 is a red star located at the lowest end of the red giant branch (near the top of the sub-giant branch) of the globular cluster M4. According to its location on the C-M diagram, A66 may be a cluster member. No proper motion and radial velocity determinations are available up to date. It is discovered that A66 is a small-amplitude new variable star with a period of about one day and the peak to peak amplitude is about 0.05 mag in V. However, if its membership can be confirmed by proper motion and radial velocity determinations, the cause of light variation may not be pulsation. This is because according to Xiong's theory, a red star at such low luminosity can not pulsate at a period longer than 0.1 day. But with the amplitude and period of A66, it is difficult to imagine that the cause of variability is due to EW type eclipsing of a binary or rotation of a spotted star. Otherwise A66 is not a cluster member.
Hu M.-H.
Lin Qiang
Sheng Chang-Jun
Yao Bao-An
Zhang Chen-Song
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