SIMBAD references

2008ApJ...672..423K - Astrophys. J., 672, 423-432 (2008/January-1)

The early evolution of massive stars: radio recombination line spectra.


Abstract (from CDS):

Velocity shifts and differential broadening of radio recombination lines are used to estimate the densities and velocities of the ionized gas in several hypercompact and ultracompact H II regions. These small H II regions are thought to be at their earliest evolutionary phase and associated with the youngest massive stars. The observations suggest that these H II regions are characterized by high densities, supersonic flows, and steep density gradients, consistent with accretion and outflows that would be associated with the formation of massive stars.

Abstract Copyright:

Journal keyword(s): ISM: H II Regions - Stars: Early-Type - Stars: Formation

CDS comments: In tables, next PKS are not identified : 1851+005, 1911-201, 2025+337, 2202+422, and 2250+558

Simbad objects: 21

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