The stellar population of the star-forming region G61.48+0.09
Abstract
Context: We present the results of a near-infrared photometric and spectroscopic study of the star-forming region G61.48+0.09.
Aims: The purpose of this study is to characterize the stellar content of the cluster and to determine its distance, extinction, age, and mass.
Methods: The stellar population was studied by using color-magnitude diagrams to select twenty promising cluster members, for which follow-up spectroscopy was done. The observed spectra allowed a spectral classification of the stars.
Results: Two stars have emission lines, twelve are G-type stars, and six are late-O or early-B stars.
Conclusions: The cluster's extinction varies from AK_S = 0.9 to AK_S = 2.6, (or AV ∼ 8 to AV ∼ 23). G61.48+0.09 is a star-forming region located at 2.5±0.4 kpc. The cluster is younger than 10 Myr and has a minimum stellar mass of 1.5± 0.5 × 10 3 M_⊙. However, the actual total mass of the cluster remains undetermined, as we cannot see its whole stellar content.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- August 2009
- DOI:
- 10.1051/0004-6361/200911853
- arXiv:
- arXiv:0904.3202
- Bibcode:
- 2009A&A...502..559M
- Keywords:
-
- stars: early-type;
- Galaxy: structure;
- infrared: stars;
- stars: Hertzprung-Russel (HR) and C-M diagrams;
- Galaxy: open clusters and associations: andividual: G61.48+0.09;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 20 pages, 10 figures. Accepted for publication in A&