SIMBAD references

2015ApJ...813...42K - Astrophys. J., 813, 42 (2015/November-1)

The O- and B-type stellar population in W3: beyond the high-density layer.


Abstract (from CDS):

We present the first results from our survey of the star-forming complex W3, combining VRI photometry with multiobject spectroscopy to identify and characterize the high-mass stellar population across the region. With 79 new spectral classifications, we bring the total number of spectroscopically confirmed O- and B-type stars in W3 to 105. We find that the high-mass slope of the mass function in W3 is consistent with a Salpeter IMF, and that the extinction toward the region is best characterized by an RV of approximately 3.6. B-type stars are found to be more widely dispersed across the W3 giant molecular cloud (GMC) than previously realized: they are not confined to the high-density layer (HDL) created by the expansion of the neighboring W4 H ii region into the GMC. This broader B-type population suggests that star formation in W3 began spontaneously up to 8-10 Myr ago, although at a lower level than the more recent star formation episodes in the HDL. In addition, we describe a method of optimizing sky subtraction for fiber spectra in regions of strong and spatially variable nebular emission.

Abstract Copyright:

Journal keyword(s): dust, extinction - open clusters and associations: individual: Westerhout 3 - stars: early-type - stars: formation - stars: luminosity function, mass function

VizieR on-line data: <Available at CDS (J/ApJ/813/42): table2.dat>

Simbad objects: 106

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