期刊
ASTROPHYSICAL JOURNAL
卷 576, 期 2, 页码 950-962出版社
IOP PUBLISHING LTD
DOI: 10.1086/341893
关键词
open clusters and associations : individual (NGC 2516); stars : abundances; stars : rotation; techniques : radial velocities
We report new measures of radial velocities and rotation rates (v sin i) for 51 F and early G stars in the open cluster NGC 2516 and combine these with previously published data. From high signal-to-noise ratio spectra of two stars, we show that NGC 2516 has a relative iron abundance with respect to the Pleiades of Delta[Fe/H] = +0.04 +/- 0.07 at the canonical reddening of E (B-V) = 0.12, in contrast to previous photometric studies that placed the cluster 0.2-0.4 dex below solar. We construct a color-magnitude diagram based on radial velocity members and explore the sensitivity of photometric determinations of the metallicity and distance to assumed values of the reddening. For a metal abundance near solar, the Hipparcos distance to NGC 2516 is probably underestimated. Finally, we show that the distribution of rotation rates and X-ray emission does not differ greatly from that of the Pleiades, when allowance is made for the somewhat older age of NGC 2516.
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