Young star clusters and the structure of the second Galactic quadrant II

MOLINA LERA, JOSÉ ALEJO; BAUME, G; GAMEN, R

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Año: 2019

0035-8711

Galactic spiral arms are traced using young objects as giant molecular clouds, H II regions, OB stars or young open/embedded clusters. To improve the knowledge of the Galactic structure in the second quadrant we selected, from more than 200 open clusters covered by the SDSS, a sample of ten young stellar clusters to conducted a spectro-photometric study. Photometric data was provided by SDSS and APASS in the optic bands and by 2MASS and WISE in the infrared. Spectroscopic information was obtained from observations acquired with GMOS/GEMINI complemented with data from the literature. For six of the ten clusters, distances were also obtained with our astrometric Gaia data analysis. To perform all tasks we used a suite of tools developed by us. Our results show that these open clusters are distributed along three spiral arms, covering distances from 1.8 to 8.0 kpc. We confirm, using our novel spectroscopic data, our previews photometric estimations regarding the Galactic location of the cluster Teutsch 45. We found that it is located beyond the ?Outer Arm? and probably belong to the more distant ?New Arm? extending its trace almost to the anti-centre. Hence, it was possible to get a better picture of the structure of the outer regions of the Galaxy. For clusters with pre-main sequence populations we also found traces of coeval star formation processes. Regarding spectroscopic data and most massive members of the clusters, we discovered 7 B-type stars, all earlier than B4 and we also confirmed the spectral classification of one O8-8.5 type star.