Hubble space telescope/faint object camera observations of the inner regions of the Galactic Globular Cluster M15

Details Hubble space telescope/faint object camera observations of the inner regions of the Galactic Globular Cluster M15 Hubble space telescope/faint object camera observations of the inner regions of the Galactic Globular Cluster M15

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106..154f&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 1, p. 154-167, 408-411.

Astronomy and Astrophysics

Astronomy

38

Color-Magnitude Diagram, Faint Object Camera, Galactic Clusters, Globular Clusters, Hubble Space Telescope, Image Resolution, Color-Color Diagram, High Resolution, Horizontal Branch Stars, Milky Way Galaxy

Scientific paper

A set of high resolution images of the core of the Galactic Globular Cluster M15 (NGC 7078) were obtained for the first time with the Faint Object Camera on the HST through the f/48-F140W, f/48-F220W and f/96-F342W ultraviolet filters. Two UV-Color-Magnitude Diagrams are presented for the approximately 300 objects measured in the 22 arcsec x 22 arcsec field centered on the core covered by our observations. Out of these, 19 are variables discovered from the rms frame-to-frame scatter of the F220W images, 15 of which are probably RR Lyrae. The existence of the gap on the Horizontal Branch (HB) separating the bulk of the HB stars from the Blue Tail already known for the outer parts of the cluster, is confirmed for the core regions. The temperature and the mass distribution of the HB stars is derived from the ultraviolet color-color diagram. We also detect a well developed Blue Straggler sequence. At least two of the brighter blue stragglers reside within the sharp core.

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