SIMBAD references

2004ApJ...601..952S - Astrophys. J., 601, 952-961 (2004/February-1)

The nature of the massive young stars in W75 N.

SHEPHERD D.S., KURTZ S.E. and TESTI L.

Abstract (from CDS):

We have observed the W75 N massive star forming region in SiO (J=2-1 and J=1-0) at 3"-5" resolution and in 6 cm, 2 cm, and 7 mm continuum emission at 1".4-0".2 resolution. The abundance ratio of [SiO]/[H2]∼5-7x10–11 is typical for what is expected in the ambient component of molecular clouds with active star formation. The SiO morphology is diffuse and centered on the positions of the ultracompact H II regions–no collimated, neutral jet was discovered. The ionized gas surrounding the protostars has emission measures ranging from 1 to 15x106 pc/cm6, densities from 0.4 to 5x104/cm3, and derived spectral types of the central ionizing stars ranging from B0.5 to B2. Most of the detected sources have spectral indices that suggest optically thin to moderately optically thick H II regions produced by a central ionizing star. The spread in ages between the oldest and youngest early-B protostars in the W75 N cluster is 0.1-5x106 yr. This evolutionary timescale for W75 N is consistent with that found for early-B stars born in clusters forming more massive stars (M*>25M).

Abstract Copyright:

Journal keyword(s): Stars: Circumstellar Matter - ISM: H II Regions - ISM: Jets and Outflows - Stars: Formation - Stars: Mass Loss

CDS comments: IRAS 20126+4014 is a misprint for IRAS 20126+4104, parag. 2.2 : quasar 2012+464 (J2012+464?) not identified

Simbad objects: 28

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2021.06.15-21:44:10

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