Small Galactic H II Regions. I. Spectral Classifications of Massive Stars
Abstract
By studying the stellar content of star-forming regions with different characteristics, such as gas cloud size, one can determine factors that affect the star-formation process. This paper is part of a study of the stellar content and natal cloud characteristics of a sample of relatively small Galactic star-forming regions. Spectral classifications based on moderate dispersion spectra of the optically visible stars in the regions are presented. The H-alpha, radio, and far-infrared luminosities of the nebulas are used as a check for additional embedded or unidentitied hot stars. A histogram of the most massive star per star-forming unit shows that there is a range in upper mass limits for the sample and that one is statistically sampling a mass function intermediate between that of Selpeter and that of Miller-Scalo.
- Publication:
-
The Astronomical Journal
- Pub Date:
- March 1990
- DOI:
- 10.1086/115378
- Bibcode:
- 1990AJ.....99..846H
- Keywords:
-
- Astronomical Spectroscopy;
- Classifying;
- H Ii Regions;
- Star Formation;
- Stellar Mass;
- Charge Coupled Devices;
- Far Infrared Radiation;
- H Alpha Line;
- Stellar Luminosity;
- Stellar Spectra;
- Stellar Temperature;
- Astrophysics;
- NEBULAE: H II REGIONS;
- LUMINOSITY FUNCTION;
- STARS: EARLY-TYPE