Spectroscopy of upper-main-sequence and blue straggler stars in the intermediate-age cluster NGC 2477

Details Spectroscopy of upper-main-sequence and blue straggler stars in the intermediate-age cluster NGC 2477 Spectroscopy of upper-main-sequence and blue straggler stars in the intermediate-age cluster NGC 2477

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..277s&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, May 1983, p. 277-283.

Astronomy and Astrophysics

Astronomy

18

Astronomical Photometry, Blue Stars, Metallicity, Star Clusters, Stellar Rotation, Stellar Spectra, A Stars, Interstellar Extinction, Main Sequence Stars, Peculiar Stars, Radial Velocity, Red Giant Stars, Stellar Evolution, Ubv Spectra

Scientific paper

Spectra are obtained for nine upper-main-sequence and three blue-straggler stars in the intermediate-age cluster NGC 2477. They are then used in testing the hypothesis that rapid rotation of the turnoff stars gives rise to a discrepancy between the metal abundance given by the uvby-beta photometry of main-sequence stars and by the DDO photometry of red giants. It is found that NGC 2477 turnoff stars are not rotating unusually rapidly relative to their Hyades counterparts. Discrepancies in the photometric metallicity estimates, however, can now be explained through recent revisions in the DDO reddening ratios and through small color corrections to the beta photometry. The spectroscopic and photometric results are all consistent with NGC 2477 being slightly older and slightly metal deficient compared with the Hyades. The mean cluster radial velocity is found to be 6 + or - 10 km/s. It is confirmed spectroscopically that star 'm' is an Am star.

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