Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5816a&link_type=abstract
American Astronomical Society, AAS Meeting #211, #58.16; Bulletin of the American Astronomical Society, Vol. 39, p.836
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Data was collected for open star clusters Collinder 394 and NGC 6645 (Dias et al. 2003, in Galactic and Stellar Dynamics, C. Boily et al. (eds), EAS Publications Series, 10, 195). Collinder 394 is well-studied, whereas only position and apparent diameter are known for NGC 6645. Collinder 394 and NGC 6645 were imaged using the PROMPT Observatory (Reichart et al. 2005, Il Nuovo Cimento C, vol. 28, Issue 4, p.767) for BV photometry. The B and V magnitudes were measured for 28 cluster members in Collinder 394. For NGC 6645, B and V magnitudes were measured of all stars within 10 arcminutes of the cluster's center. Cluster membership, distance modulus, interstellar reddening and distance to cluster were determined from the observed BV color magnitude diagrams (CMD). The distance modulus of Collinder 394 was found to be 9.30mag ±0.2mag and a reddening of 0.30mag ±0.02mag, implying a distance of 630pc ±100pc. NGC 6645 was found to have a distance modulus of 9.8mag ±0.2mag and a reddening of 0.46mag ±0.02mag, implying a distance of 740 pc ±100pc. Of the 119 stars measured in the region of NGC 6645, 72 stars were found to be possible cluster members based on the CMD. The best match of a theoretical CMD (Bressan et al. 1996, AA Supp, 117, 113) to that observed for stars in NGC 6645 is the isochrone with temperature range of 6600 K and 8100 K and mass range from 0.86 to 1.04 solar masses. The age of NGC 6645 was found to be about 9.7 billion years from the turnoff on its color-magnitude diagram. This makes NGC 6645 one of the oldest open clusters.
Aubrey Michael
Castelaz Michael
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