Photometry in the central region of the globular cluster NGC 7099

Details Photometry in the central region of the globular cluster NGC 7099 Photometry in the central region of the globular cluster NGC 7099

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26as...50..141a&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 50, Oct. 1982, p. 141-146.

Astronomy and Astrophysics

Astrophysics

13

Globular Clusters, Stellar Spectrophotometry, Ubv Spectra, Astronomical Photography, Blue Stars, Horizontal Branch Stars, Red Giant Stars, Stellar Evolution, Stellar Luminosity

Scientific paper

The results of iris photometry in the UBV system on short exposure plates of M30 (NGC 7099) are discussed. The photometry is given for the bright stars within a radius of 10 to 90 arcsec from the cluster center. A factor-of-two deficiency of blue horizontal branch stars to red giant stars is found for the central part of the cluster, compared to similar evaluations made at a radius of 80 to 300 arcsec. These ratios render values of helium content which range from about 0.27 in the outer regions to about 0.12 in the central region.

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