Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-09-22
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
7 pages, 4 figures (Fig. 1 reduced in quality), accepted for publication in Astronomy and Astrophysics
Scientific paper
We investigated the nature of the massive star [OMN2000] LS1 and used these results to constrain the history of star formation within the host complex W51. A combination of near-IR spectroscopy and non-LTE model atmosphere analysis was used to derive the physical properties of [OMN2000] LS1 and a combination of theoretical evolutionary calculations and Monte Carlo simulations to apply limits on the star formation history of W51. The spectrum of [OMN2000] LS1 is consistent with that of a P Cygni supergiant, but with a temperature of 13.2-13.7kK and log(L/L_sun)<5.75, it is significantly cooler, less luminous, and massive than proposed by previous authors. The presence of such a star within W51 shows that star formation has been underway for at least 3Myr, while the formation of massive O stars is still on going. We find no evidence of internally triggered, sequential star formation within W51, and favour the suggestion that star formation has proceeded at multiple indepedent sites within the GMC. [ABRIDGED]
Clark Simon J.
Crowther Paul A.
Davies Ben
MacKenty John
Messineo Maria
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