Bibcode
Ramírez-Alegría, S. A.; Herrero, A.; Marín-Franch, A.
Bibliographical reference
Highlights of Spanish Astrophysics VII, Proceedings of the X Scientific Meeting of the Spanish Astronomical Society (SEA), held in Valencia, July 9 - 13, 2012, Eds.: J.C. Guirado, L.M. Lara, V. Quilis, and J. Gorgas., pp.606-611
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5
2013
Citations
0
Refereed citations
0
Description
We present two new massive clusters, discovered during the second phase
of our MASGOMAS project (MAssive Stars in Galactic Obscured MAssive
clusterS). The second phase of the project focuses on a systematic
search of OB-type star candidates over-densities. We also present new
near-infrared photometry (J, H, and K_S) and mid-resolution follow-up
spectroscopy (H and K), obtained with LIRIS at ORM (La Palma), for the
stellar content of the new massive clusters. With these data we have
confirmed that Masgomas-1, the first candidate discovered by us, is a
young and massive cluster, probably exceeding 10^4 {M}_{&sun;}, which
hosts both an OB-type and an RSG populations. We have also determined
the cluster distance and extinction, placing it in the Scutum-Centaurus
arm, but far from the arm base (where RSGC1, RSGC2, RSGC3, Alicante 8
and Alicante 10 clusters are located), and closer to the Sun. For our
second new massive cluster candidate (Masgomas-4), we have
spectroscopically confirmed the presence of a massive stellar
population, and photometrically detected a group of massive pre-stellar
objects (Herbig Ae/Be candidates). With the estimated individual
distances for the cluster massive stars, we have derived a single
distance for both cores, confirming that Masgomas-4 is a single young
cluster.