A Deep UBV RI CCD photometric study of open clusters Tr 1 and Be 11
Sep, 200215 pages
Published in:
- Mon.Not.Roy.Astron.Soc. 337 (2002) 133
e-Print:
- astro-ph/0209048 [astro-ph]
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Abstract: (arXiv)
We present deep CCD photometry for the young open star clusters Tr 1 and Be 11. The CCD data for Be 11 is obtained for the first time. The sample consists of 1500 stars reaching down to 21 mag. Analysis of the radial distribution of stellar surface density indicates that radius values for Tr 1 and Be 11 are 2.3 and 1.5 pc respectively. The interstellar extinction across the face of the imaged clusters region seems to be non-uniform with a mean value of = 0.600.05 and 0.950.05 mag for Tr 1 and Be 11 respectively. A random positional variation of is present in both the clusters. In the cluster Be 11, the reason of random positional variation may be apparent association of the HII region (S 213). The 2MASS data in combination with the optical data in the cluster Be 11 yields = 0.400.20 mag and = 2.200.20 mag. Colour excess diagrams indicate a normal interstellar extinction law in the direction of cluster Be 11. The distances of Tr 1 and Be 11 are estimated as 2.60.10 and 2.20.10 Kpc respectively, while the theoretical stellar evolutionary isochrones fitted to the bright cluster members indicate that the cluster Tr 1 and Be 11 are 4010 and 11010 Myr old. The mass functions corrected for both field star contamination and data incompleteness are derived for both the clusters. The slopes and for Tr 1 and Be 11 respectively are in agreement with the Salpeter's value. Observed mass segregations in both clusters may be due to the result of dynamical evolutions or imprint of star formation processes or both.References(26)
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