Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84..319h&link_type=abstract
Astronomical Journal, vol. 84, Mar. 1979, p. 319-323. Research supported by the National Research Council of Canada.
Astronomy and Astrophysics
Astrophysics
23
Astronomical Observatories, Astrophysics, Red Giant Stars, Star Clusters, Stellar Spectrophotometry, Abundance, Cyanogen, Interstellar Extinction, Open Clusters, Stellar Gravitation, Stellar Magnitude, Stellar Mass, Stellar Temperature
Scientific paper
DDO intermediate-band photometry of 11 red giants in the field of the sparsely populated open cluster NGC 752 is reported. Physical properties of the 11 stars, such as heavy-element abundances, surface gravities, and effective temperatures, are determined. A cluster age of 1.1 plus or minus 0.1 billion years is obtained by means of a comparison with Patenaude's (1978) theoretical isochrones. A true distance modulus of 7.9 plus or minus 0.2 mag is estimated for NGC 752, along with a true distance of 380 plus or minus 40 pc, an Fe/H abundance ratio of 0.0 plus or minus 0.1, and a red-giant mean mass of 1.5 plus or minus 0.2 solar masses. It is concluded that NGC 752 is on the metal-rich side of the distribution of intermediate and old open clusters, at about the same Fe/H value as NGC 7789 and halfway between NGC 2477 and NGC 2243.
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