Further observations of stars in the intermediate-age open cluster NGC 2477.

Abstract

view Abstract Citations (42) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Further observations of stars in the intermediate-age open cluster NGC 2477. Hartwick, F. D. A. ; Hesser, J. E. Abstract Recent uvby-Hfl photometry of main-sequence stars in NGC 2477 has led to the following conclusions: (i) Confirmation of previously determined reddenings and V-band photometry. (ii) The surface gravities of the turnoff stars are similar to those of analogous Hyades stars. (iii) The existence of a discrepancy between [Fe!H] inferred from m1 and CN measures that can be at least partially resolved if the cluster contains a large number of rapidly rotating stars (v sin i 200 km s-1). (iv) NGC 2477 appears to have a number of Am stars. (v) Three stars identified as possible "blue stragglers" have higher masses than stars near the turnoff point. (vi) The upward-revised turnoff point at V = 13.3 mag (Mv = 1.7) leads to an age and turnoff mass of 0.9 x 10 years and 1.9 , respectively. Additional B, V photographic data for 1,200 stars are presented and used to construct a new color- magnitude diagram based on 1,900 stars to Mv + 6.4 mag. Results of a survey that revealed two carbon stars in the near vicinity of the cluster are presented and compared with results for other intermediate-age clusters, and photoelectric photometry demonstrating the variability of the two stars is given. Finally, from a discussion of data in the literature we present evidence for a correlation between A and V sin i in main-sequence A and F stars in the range 0.1 < (b - Y)o < 0.25 mag. Subject headings: abundances, stellar - carbon stars - metallic-line stars - open clusters - photometry - rotation, stellar Publication: The Astrophysical Journal Pub Date: September 1974 DOI: 10.1086/153070 Bibcode: 1974ApJ...192..391H full text sources ADS | data products SIMBAD (81) GCPD (1)