Release 11.12 ("Hergest Ridge")
Release 11.12 ("Hergest Ridge")
| Article ID: gc500 | |
| Author | Arellano Ferro, A. et al. |
| Title | Revisiting the variable star population in NGC 6229 and the structure of the horizontal branch |
| Journal | |
| Year of publication | 2015 (on gclusters from 2015-11-25 10:19:06 ) |
| Abstract | We report an analysis of new V and I CCD time series photometry of the distant globular cluster NGC 6229. The principal aims were to explore the field of the cluster in search of new variables, and to Fourier decompose the RR Lyrae light curves in pursuit of physical parameters. We found 25 new variables: 10 RRab, 5 RRc, 6 SR, 1 CW, 1 SX Phe, and 2 that we were unable to classify. Secular period changes were detected and measured in some favourable cases. The classifications of some of the known variables were rectified. (...) The distribution of RR Lyrae stars in the horizontal branch shows a clear empirical border between stable fundamental and first overtone pulsators which has been noted in several other clusters; we interpret it as the red edge of the first overtone instability strip. |
| Also available at: | http://arxiv.org/abs/1506.03145 |
| Tags | NGC 6229 |
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