Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006basi...34..141s&link_type=abstract
Bulletin of the Astronomical Society of India, vol. 34, Issue 2, p.141
Astronomy and Astrophysics
Astronomy
Colour-Magnitude Diagrams, Open Clusters And Associations: Individual (Ngc 2099), Stars: Evolution, Techniques: Spectroscopic, White Dwarfs
Scientific paper
We derive the age, distance, reddening, binary fraction, metallicity, and star formation rate for the rich open star cluster NGC 2099 by comparing a high quality observational colour-magnitude diagram (CMD) with synthetic CMDs based on MonteCarlo numerical simulations. This approach accounts for all of the main parameters which determine the shape of the CMD for a stellar population and, unlike theoretical isochrone fits, allows a detailed comparison of the number of stars in various evolutionary phases. The resulting parameters are a key input into determining how much mass stars in NGC 2099 have lost through post main-sequence evolution. We follow up our deep imaging study with multi-object spectroscopy of ~20 cluster white dwarf stars and constrain the initial-final mass relationship. The results clearly indicate that stars with initial masses between 2.8 and 3.4 MOdot lose 70-75% of their mass through stellar evolution. For the first time, we find some evidence for a metallicity dependence on the initial-final mass relationship.
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