Release 11.12 ("Hergest Ridge")
Release 11.12 ("Hergest Ridge")
| Article ID: gc384 | |
| Author | Alcaino, Gonzalo; Liller, William; Alvarado, Franklin; Wenderoth, Erich |
| Title | BVRI CCD photometry of the globular cluster M55 (NGC 6809) |
| Journal | Astronomical Journal, vol. 104, no. 1, p. 190-202, 431-433 |
| Year of publication | 1992 (on gclusters from 2013-10-11 17:10:12 ) |
| Abstract | The paper presents BVRI photometry of two neighboring fields in the globular cluster M55 (NGC 6809) observed with a CCD camera and the 2.2-m telescope at ESO/La Silla. A comparison of BV color-magnitude diagram (CMD) of the M55 with those of Lee (1977) and Schade et al. (1988) showed generally good agreement down to about a magnitude below the main-sequence turnoff, although deviations at the extreme values of color and magnitude were found. The four-color CMDs fitted to the theoretical isochrons of VandenBerg and Bell (1985) give a best age of 14.5 +/-3 Gyr. |
| Tags | NGC 6809 |
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