Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pasp...96..406h&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 96, June 1984, p. 406-418.
Astronomy and Astrophysics
Astronomy
23
Color-Magnitude Diagram, Globular Clusters, Hertzsprung-Russell Diagram, Stellar Color, Stellar Luminosity, Stellar Spectrophotometry, Astronomical Photography, Horizontal Branch Stars, Peculiar Stars, Radial Velocity, Red Giant Stars, Subgiant Stars
Scientific paper
New photoelectric calibrating photometry and new photographic photometry have been obtained in the sparse star cluster E3 = C0921-770. A sparsely populated subgiant branch is now evident in the new color-magnitude diagram, and the position and shape of this sequence relative to the turnoff is further evidence that E3 is a globular, rather than an open, star cluster. Its distance modulus is ⪆14 mag. The substantial population of stars more luminous and cooler than the turnoff ("yellow stragglers") may require a larger correction for field-star contamination than previously expected. Relative to the main-sequence turnoff of much more populous globular clusters, E3 seems to be genuinely deficient in evolved stars.
Cannon Russell D.
Egles D.
Hawarden Tim G.
Hesser James Edward
Kruger B.
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