The young open cluster Trumpler 3
Abstract
We present a photometric and spectroscopic study of the poorly investigated open cluster Trumpler 3. Basic parameters such as the age of 70±10 Myr, the color excess E(B-V)=0.30±0.02 mag, the distance of 0.69±0.03 kpc and the limiting radius of 12\arcmin were redetermined and compared with previous preliminary studies. The distance of 0.65±0.09 kpc was determined independently by spectral parallaxes. Simultaneously, our analysis allowed us to estimate a total number of members to be Ntot=570±90 and a total mass of the cluster to be Mtot=270±40 M⊙. We also determined a state of cluster's dynamical evolution. We conclude that Trumpler 3 is a young low-massive stellar ensemble with a typical mass function slope, located near to the outer edge of the Galaxy's Orion Spur. As a result of a wide-field search for short period variable stars, 24 variables were discovered in the cluster's area. Only one of them - a variable of the γ-Dor type - was found to be a likely cluster member.
- Publication:
-
Astronomische Nachrichten
- Pub Date:
- March 2010
- DOI:
- 10.1002/asna.200911338
- arXiv:
- arXiv:1002.3789
- Bibcode:
- 2010AN....331..312M
- Keywords:
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- open clusters and associations: individual: (Trumpler 3);
- techniques: photometric;
- techniques: spectroscopic;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- doi:10.1002/asna.200911338