The nearby Galaxy structure toward the Vela Gum nebula
E. E. Giorgi, G. R. Solivella, G. I. Perren, R. A. V\'azquez

TL;DR
This study uses photometry and spectroscopy to analyze open clusters near the Vela Gum nebula, revealing new stellar associations, distances, and implications for Galactic structure and disk thickening.
Contribution
It provides new distance and membership data for clusters and stars, and suggests the existence of extended stellar groups and structural features in the Third Galactic Quadrant.
Findings
Detection of young stars at ~1 kpc indicating stellar groups and disk thickening.
Identification of distant young stars possibly belonging to the Outer, Perseus, or Local Arms.
Confirmation of the extension of the Local Arm and disk flaring and warping effects.
Abstract
We report on photometry and spectroscopy for MK classification purposes carried out in the fields of five open clusters projected against the Vela Gum in the Third Galactic Quadrant of the Galaxy. They are Ruprecht 20, Ruprecht 47, Ruprecht 60, NGC 2660 and NGC 2910. We could improve/confirm the parameters of these objects derived before. The spectroscopic parallax method has been applied to several stars located in the fields of four out of the five clusters to get their distances and reddenings. With this method we found two blue stars in the field of NGC 2910 at distances that make them likely members of Vela OB1 too. Also, projected against the fields of Ruprecht 20 and Ruprecht 47 we have detected other young stars favoring not only the existence of Puppis OB1 and OB2 but conforming a young stellar group at kpc from the Sun and extending for more than 6 kpc outward…
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