K Giants in 47 Tucanae: Detection of a New Class of Variable Stars

Details K Giants in 47 Tucanae: Detection of a New Class of Variable Stars K Giants in 47 Tucanae: Detection of a New Class of Variable Stars

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...464l.157e&link_type=abstract

Astrophysical Journal Letters v.464, p.L157

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73

Galaxy: Globular Clusters: Individual Name: 47 Tucanae, Stars: Oscillations, Stars: Variables: Other

Scientific paper

We report the discovery of variability among K giants in the globular cluster 47 Tucanae, using a time series of U exposures with the Hubble Space Telescope. The variables lie along a narrow band in the color-magnitude diagram, joining the faint end of the asymptotic giant branch to the red giant branch. The variations, if coherent, mostly have periods between ~2 and ~4 days, consistent with low-overtone radial pulsation or nonradial pulsation, and V amplitudes in the range 5--15 mmag, which explains their nondetection so far in clusters. One of the variables may have a period of 1.1 days and a V amplitude of 5.3 mmag. These stars define a new class of variable stars and probably contain variable field K giants such as alpha Boo as members. An understanding of their variations may have significant ramifications for theories of stellar structure and stellar evolution.

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