Release 11.12 ("Hergest Ridge")
Article ID: gc536 | |
Author | Kunder, Andrea et al. |
Title | The RR Lyrae Variables and Horizontal Branch of NGC 6656 (M22) |
Journal | The Astronomical Journal, Volume 146, Issue 5, 15 pp. |
Year of publication | 2013 (on gclusters from 2017-05-25 12:31:32 ) |
Abstract | The first calibrated broadband UBVI time-series photometry is presented for the RR Lyrae variable stars in NGC 6656 (M22), with observations spanning a range of 22 years. We have also redetermined the variability types and periods for the RR Lyrae stars identified previously by photographic observations, revising the number of fundamental-mode RR Lyrae variables (RR0) to 10 and the number of first-overtone variables (RR1) to 16. The mean periods of the RR0 and RR1 variables... |
Tags | NGC 6656 |
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