SCYON Abstract

Received on August 28 2002

A deep UBVRI CCD photometric study of the open clusters Tr 1 and Be 11

Authors	R.K.S. Yadav ¹ and Ram Sagar ^1,2
Affiliation	¹ State Observatory, Manora Peak Nainital, 263129 ² Indian Institute of Astrophysics, Bangalore 560034, India
Accepted by	Monthly Notices of the Royal Astronomical Society
Contact	rkant@upso.ernet.in / sagar@upso.ernet.in
URL
Links	Tr 1 / Be 11

Abstract

We present deep UBVRI 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 V ~ 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 E(B-V) = 0.60 ± 0.05 and 0.95 ± 0.05 mag for Tr 1 and Be 11 respectively. A random positional variation of E(B-V) 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 JHK data in combination with the optical data in the cluster Be 11 yields E(J-K) = 0.40 ± 0.20 mag and E(V-K) = 2.20 ± 0.20 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 2.6 ± 0.10 and 2.2 ± 0.10 Kpc respectively, while the theoretical stellar evolutionary isochrones fitted to the bright cluster members indicate that the cluster Tr 1 and Be 11 are 40 ± 10 and 110 ± 10 Myr old. The mass functions corrected for both field star contamination and data incompleteness are derived for both the cluste rs. The slopes 1.50 ± 0.40 and 1.22 ± 0.24 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.