Volume 567, July 2014
|Number of page(s)||12|
|Section||Galactic structure, stellar clusters and populations|
|Published online||10 July 2014|
Masgomas-4: Physical characterization of a double-core obscured cluster with a massive and very young stellar population
1 The Millennium Institute of Astrophysics (MAS), Santiago, Chile
2 Instituto de Astrofísica, Universidad de Valparaíso, Valparaíso, Chile
3 Centro de Estudios de Física del Cosmos de Aragón (CEFCA), 44001, Teruel, Spain
4 Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain
5 Departamento de Astrofísica, Universidad de La Laguna, 38205 La Laguna, Tenerife, Spain
Received: 27 October 2013
Accepted: 9 May 2014
Context. The discovery of new, obscured massive star clusters has changed our understanding of the Milky Way star-forming activity from a passive to a very active star-forming machine. The search for these obscured clusters is strongly supported by the use of all-sky, near-IR surveys.
Aims. The main goal of the MASGOMAS project is to search for and study unknown, young, and massive star clusters in the Milky Way, using near-IR data. Here we try to determine the main physical parameters (distance, size, total mass, and age) of Masgomas-4, a new double-core obscured cluster.
Methods. Using near-IR photometry (J, H, and KS) we selected a total of 21 stars as OB-type star candidates. Multi-object, near-IR follow-up spectroscopy allowed us to carry out the spectral classification of the OB-type candidates.
Results. Of the 21 spectroscopically observed stars, ten are classified as OB-type stars, eight as F- to early G-type dwarf stars, and three as late-type giant stars. Spectroscopically estimated distances indicate that the OB-type stars belong to the same cluster, located at a distance of 1.90+1.28-0.90 kpc. Our spectrophotometric data confirm a very young and massive stellar population, with a clear concentration of pre-main-sequence massive candidates (Herbig Ae/Be) around one of the cluster cores. The presence of a surrounding H II cloud and the Herbig Ae/Be candidates indicate an upper age limit of 5 Myr.
Key words: infrared: stars / stars: early-type / stars: massive / open clusters and associations: individual: Masgomas-4 / techniques: photometric / techniques: spectroscopic
© ESO, 2014
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.