SCYON Abstract

Received on February 27 2010

The young open cluster Trumpler 3

AuthorsG. Maciejewski (1,2) and L. Bukowiecki (1)
Affiliation(1) Torun Centre for Astronomy, N. Copernicus University, Gagarina 11, PL-87100 Torun, Poland
(2) Astrophysikalisches Institut und Universitäts-Sternwarte, Schillergässchen 2-3, D-07745 Jena, Germany
Accepted byAstronomische Nachrichten
Contactgm@astri.uni.torun.pl
URLhttp://www.astri.uni.torun.pl/~gm/OCS/tr3.html
Links 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' 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(sun). 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.