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

Journal Article · Sun May 01 04:00:00 EDT 1983 · Publ. Astron. Soc. Pac.; (United States)

DOI:https://doi.org/10.1086/131158· OSTI ID:6351139

Smith, H A; Hesser, J E

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. 28 references.

• Research Organization: Michigan State Univ., East Lansing
• OSTI ID: 6351139
• Journal Information: Publ. Astron. Soc. Pac.; (United States), Journal Name: Publ. Astron. Soc. Pac.; (United States) Vol. 95; ISSN PASPA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
GIANT STARS
MAIN SEQUENCE STARS
MOTION
PHOTOMETRY
RADIAL VELOCITY
RED GIANT STARS
ROTATION
STAR CLUSTERS
STAR EVOLUTION
STARS
VELOCITY