The Galactic Open Cluster NGC 6531 (M21)

Details The Galactic Open Cluster NGC 6531 (M21) The Galactic Open Cluster NGC 6531 (M21)

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jkas...34..149p&link_type=abstract

Journal of the Korean Astronomical Society, vol. 34, no. 3, pp. 149-155

Computer Science

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3

Open Clusters And Associations: Individual (Ngc 6531), Stars: Pre-Main Sequence Performance

Scientific paper

UBVRI and H_alpha photometry has been performed for the open cluster NGC 6531. A total of 56 bright main sequence (MS) members were selected from their positions in photometric diagrams. We also classified 7 pre-main sequence (PMS) stars and 6 PMS candidates with H_alpha emission from H_alpha photometry. We determined a reddening of = 0.29 +- 0.03 and a distance modulus of Vo - Mv = 10.5 for the cluster. From the comparison of our photometric results to theoretical evolution models, we derived a MS turnoff age of 7.5 Myr and a PMS age spread of ~ 4 Myr. The IMF slope Gamma, calculated in the mass range of 0.45 <= log m <= 1.35 is a steep value of Gamma = -1.8 +- 0.6.

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