Rotation and activity in the solar-metallicity open cluster NGC2516

Details Rotation and activity in the solar-metallicity open cluster NGC2516 Rotation and activity in the solar-metallicity open cluster NGC2516

2002-05-17

arxiv.org/abs/astro-ph/0205300v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in the Astrophysical Journal. 35 pages including 7 figures

Scientific paper

10.1086/341893

We report new measures of radial velocities and rotation rates (v sin i) for 51 F and early-G stars in the open cluster NGC2516, and combine these with previously published data. From high signal-to-noise spectra of two stars, we show that NGC2516 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 to 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 NGC2516 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 NGC2516.

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