Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pasp...90..379m&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 90, Aug.-Sept. 1978, p. 379-385.
Astronomy and Astrophysics
Astronomy
Astrometry, Astronomical Photometry, Globular Clusters, Astronomical Maps, Galactic Nuclei, Stellar Magnitude
Scientific paper
An area photometer consisting of a square two-dimensional array of 2500 silicon diodes is described which is particularly suitable for the observation of bright objects with a wide range of intensity and also as an astrometric device in very small fields. Results are reported for BVR observations with this photometer of the bright globular cluster M15. A color map of M15 is presented which shows that the brightest stars at the center of the cluster are red and that the nuclear region appears slightly redder than the underlying stellar distribution but not as red as the brightest red giants. A lack of unusual color variations in the central region is noted, and the importance of R photometric maps in isolating red giants from the less luminous underlying population is stressed.
Mochnacki Stefan Wladyslaw
Walker Gordon A. H.
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