The young open cluster Trumpler 3

✍ Scribed by G. Maciejewski; L. Bukowiecki

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 394 KB
• Volume: 331
• Category: Article
• ISSN: 0004-6337
• DOI: 10.1002/asna.200911338

✦ Synopsis

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 N~tot~ = 570 ± 90 and a total mass of the cluster to be M~tot~ = 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 (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)