Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apjs...58..225f&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 58, June 1985, p. 225-254. Research supported by the Natural Scie
Astronomy and Astrophysics
Astrophysics
126
Astronomical Photometry, Globular Clusters, Stellar Evolution, Charge Coupled Devices, Chronology, Interstellar Extinction, Main Sequence Stars, Metallicity, Stellar Color, Stellar Luminosity
Scientific paper
CCD photometry in U, V, and B wavelengths is presented for a field of 5 x 3 arcmin in the globular cluster M15. The photometric observations were carried out using the Cerro Tololo 4-m telescope in prime focus. The photometric data were used to obtain new estimates of reddening in M15 based on the bright field stars. New estimates of metallicity were also obtained by measuring the ultraviolet excess in the main sequence stars. The luminosity function of the cluster was studied down to V = 2.28 and was found to be consistent with a power-law mass function of n(M) = Q(M) sq rt alpha, where alpha is equal to about 2.5 + or - 1.0. Comparison with published data showed that the number of field stars in the red region of the cluster main sequence exceeded previous estimates by as much as 50 percent. The reddening of M15 was found to be E(B-V) = 0.11 + or - 0.04, and the ultraviolet excess relative to the Hyades cluster was delta(0.06) = 0.25 + or - 0.02. On the basis of the metal-poor isochrones obtained for the forbidden line emission of Fe/H and O/Fe, an age of 16 + or - 3 x 10 to the 9th years is estimated.
Fahlman Gregory G.
Richer Harvey B.
VandenBerg Don. A.
No associations
LandOfFree
Deep CCD photometry in globular clusters. III - M15 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Deep CCD photometry in globular clusters. III - M15, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Deep CCD photometry in globular clusters. III - M15 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1663847