Probing Multiple Stellar Populations In The Open Cluster Trumpler 20

Details Probing Multiple Stellar Populations In The Open Cluster Trumpler 20 Probing Multiple Stellar Populations In The Open Cluster Trumpler 20

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545519p&link_type=abstract

American Astronomical Society, AAS Meeting #215, #455.19; Bulletin of the American Astronomical Society, Vol. 42, p.475

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Ignoring the globular clusters, multiple stellar populations have been discovered in some intermediate-age LMC star clusters but not yet in any Galactic open cluster. However, a recently-unveiled rich, 1.3-Gyr old Galactic open cluster Trumpler 20 appears to offer propitious clues about the bimodality of its main sequence. We present new BVI observations obtained with the CTIO 1-m telescope. We also present comprehensive VLT/FLAMES high-resolution spectroscopic observations obtained at the ESO/Paranal. Kinematic membership in Trumpler 20 is derived from a single epoch radial velocities for more than 900 stars. The color-magnitude diagram of Trumpler 20 indicates a double main sequence turn-off and a considerable extension of the red clump. The distribution of [Fe/H] values for 87 red giants is consistent with Trumpler 20 having a single metallicity. The cluster is conspicuously rich with fast rotators (vsin i > 100 km/s), many of whom are located near the main sequence turn-off, thus lending support to the suggestion by Bastian & de Mink that for intermediate age (1-2 Gyr) clusters the effects of stellar rotation have direct implications on the structure of main sequence near the turn-off. Trumpler 20 is the first known Galactic open cluster to show this phenomenon.
This work is supported in part by a NSF grant 09-08114 to JHU.

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