Detalles de publicación
PP 014069
Masgomas-04: Physical characterization of a double-core obscured cluster with a massive and very young population
(1) The Millennium Institute of Astrophysics (MAS), Santiago, Chile.
(2) Instituto de Astrofísica, Universidad de Valparaíso, Valparaíso, Chile
(3) Centro de Estudios de F ́ısica del Cosmos de Arago ́n (CEFCA), E-44001, Teruel, Spain.
(4) Instituto de Astrof ́ısica de Canarias, 38205 La Laguna, Tenerife, Spain.
(5) Departamento de Astrof ́ısica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain.
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 kpc. Our spectrophotometric data confirm a very young and massive stellar population, with a clear −0.90
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.
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 kpc. Our spectrophotometric data confirm a very young and massive stellar population, with a clear −0.90
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.