Rotation and Activity in the Solar-Metallicity Open Cluster NGC 2516
Abstract
We report new measures of radial velocities and rotation rates (vsini) 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 Δ[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. Based on observations obtained at the Anglo-Australian Telescope and on observations obtained at the Cerro Tololo Inter-American Observatory, NOAO, which is operated by the Associated Universities for Research in Astronomy (AURA), Inc., under cooperative agreement with the National Science Foundation.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- September 2002
- DOI:
- 10.1086/341893
- arXiv:
- arXiv:astro-ph/0205300
- Bibcode:
- 2002ApJ...576..950T
- Keywords:
-
- Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 2516;
- Stars: Abundances;
- Stars: Rotation;
- Techniques: Radial Velocities;
- Astrophysics
- E-Print:
- Accepted for publication in the Astrophysical Journal. 35 pages including 7 figures