SIMBAD references

2010ApJ...714L.285P - Astrophys. J., 714, L285-L289 (2010/May-2)

Evidence for delayed massive star formation in the M17 proto-OB association.


Abstract (from CDS):

Through analysis of archival images and photometry from the Spitzer GLIMPSE and MIPSGAL surveys combined with Two Micron All Sky Survey and MSX data, we have identified 488 candidate young stellar objects (YSOs) in the giant molecular cloud M17 SWex, which extends ∼50 pc southwest from the prominent Galactic H II region M17. Our sample includes >200 YSOs with masses >3 M that will become B-type stars on the main sequence. Extrapolating over the stellar initial mass function (IMF), we find that M17 SWex contains >1.3x104 young stars, representing a proto-OB association. The YSO mass function is significantly steeper than the Salpeter IMF, and early O stars are conspicuously absent from M17 SWex. Assuming M17 SWex will form an OB association with a Salpeter IMF, these results reveal the combined effects of (1) more rapid circumstellar disk evolution in more massive YSOs and (2) delayed onset of massive star formation.

Abstract Copyright:

Journal keyword(s): circumstellar matter - ISM: clouds - stars: formation - stars: luminosity function, mass function

VizieR on-line data: <Available at CDS (J/ApJ/714/L285): table1.dat>

Nomenclature: NAME M17 SWex. Table 1: [PW2010] NNN (Nos 1-488).

Simbad objects: 494

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