Tag: OB association

Formation and evolution of the Sco OB2 association. The study: “Stellar population of Sco OB2 revealed by Gaia DR2 data” of F. Damiani (INAF-OAPA) recently appeared on A&A

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OB associations have a rich population of massive stars (O and B stars), which are young and typically dispersed over large regions of the sky. While these massive stars can be easily recognized thanks to their intense luminosity, it is very hard to select the low mass stars belonging to OB associations. This because without evident stellar concentrations, these stars

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X-rays from Cygnus. The paper: “X-ray spectral characterization of the young Cygnus OB2 population” of E. Flaccomio (INAF-OAPA) accepted for publication by ApJS

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OB associations are objects of great importance, since they contain a rich population of OB stars. Despite their paucity, OB stars have a strong impact on the evolution of their parental clouds, nearby stars, and the whole Galaxy. For instance, their intense UV emission affects the evolution of the parental cloud and the star formation process in it, sometimes triggering

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Low mass stars in the OB association Scorpius OB1

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OB associations are groups of massive stars (with spectral type O and B, more massive than 3.5 solar masses) which typically cover wide regions in the sky. The presence of such a rich population of massive stars suggests the presence of even a larger population of low-mass stars. There exists, in fact, a relation between the number of stars in

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Star formation history in Canis Major. Recently published by A&A “Star formation history of Canis Major OB1” of T. Santos-Silva

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Stars in several star forming regions are observed with a spread in age. This support the idea that star formation is a “slow” process which can propagate across a molecular cloud over million of years (as suggested, for instance, by the Palla & Stahler 2000 study), while several authors have instead suggested that star formation is a “fast” process (e.g.

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