The stellar population of the star-forming region G61.48+0.09

A. Marin-Franch (1), A. Herrero (1,2), A. Lenorzer (1), F. Najarro (3), S. Ramirez (1), A. Font-Ribera (1), D. Figer (4)

(1) Instituto de Astrofisica de Canarias, 38200 La Laguna, Tenerife, Spain
(2) Departamento de Astrofisica, Universidad de La Laguna, Spain
(3) Departamento de Astrofisica Molecular e Infrarroja, IEM, CSIC, Madrid, Spain
(4) Rochester Institute of Technology, Rochester, NY, USA}

- 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 A_{K_S} = 0.9 to A_{K_S} = 2.6, (or A_{V}~8 to A_{V}~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 1500+/-500 Solar masses. However, the actual total mass of the cluster remains undetermined, as we cannot see its whole stellar content.

Status: Manuscript has been accepted