The Color-Magnitude Array for Stars in the Globular Cluster M 15.

Abstract

view Abstract Citations (27) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Color-Magnitude Array for Stars in the Globular Cluster M 15. Brown, Archibald Abstract The paper gives photovisual and photographic magnitudes for a number of stars in the globular cluster M 15, as measured from direct photographs taken at the McDonald Observatory. The photographs were calibrated by means of a sequence of stars in the field whose magnitudes had been determined with a photoelectric photometer. It was possible to recognize a number of foreground stars in the photographs from their proper motion and to eliminate these stars from the color-magnitude diagram. The resulting diagram shows a well-defined "red-giant" sequence extending from absolute magnitude -0.6 on the photovisual scale (color index approximately 0.65) to absolute magnitu,de -2.8 (color index 1.4). In addition, there are a few scattered stars on the blue side of this "red-giant' sequence. Publication: The Astrophysical Journal Pub Date: March 1951 DOI: 10.1086/145404 Bibcode: 1951ApJ...113..344B full text sources ADS | data products SIMBAD (298)