A search for giant and asymptotic-giant-branch variable stars in six globular clusters

Details A search for giant and asymptotic-giant-branch variable stars in six globular clusters A search for giant and asymptotic-giant-branch variable stars in six globular clusters

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.2555w&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 90, Dec. 1985, p. 2555-2574. Research supported by the Alfred P. Sloan Foundation an

Astronomy and Astrophysics

Astronomy

26

Astronomical Photometry, Asymptotic Giant Branch Stars, Giant Stars, Globular Clusters, Variable Stars, Astronomical Catalogs, Light Curve, Photographic Plates, Root-Mean-Square Errors

Scientific paper

Photographic photometry has been obtained via a PDS microdensitometer in a systematic search for variability of stars on the giant and asymptotic-giant branches of six globular clusters. Typical rms measurement errors of σB ≡ 0.04 mag for the brighter stars permit detection of variability with an amplitude AB ⪆ 0.2 mag. Within that limit, the author found variables only near the tip of the giant branch; most stars with Mbol ⪉ -3.0 probably are small-amplitude variables. Variability for any fainter giant and asymptotic-giant-branch stars is not confirmed. Lack of further information (reliable periods, variations in color and spectra) for most of the variables precludes detailed determination of their properties; possible correlations with Hα emission and polarization are briefly noted.

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