Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...152..300n&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 152, no. 2, Nov. 1985, p. 300-304.
Astronomy and Astrophysics
Astrophysics
3
Early Stars, H Ii Regions, Hot Stars, Infrared Spectra, Stellar Spectrophotometry, Gas Ionization, Interstellar Extinction, Luminosity, Near Infrared Radiation, Stellar Temperature
Scientific paper
This paper investigates the possibility of determining effective temperature and size of stars exciting compact, obscured H II regions by comparing their near-infrared flux to the bolometric luminosity, as discussed by Blackwell and Shallis (1977). The H II region G333.6 - 0.2 is used as an example. The effective temperature of the central star lies between 35,000 K and 50,000 K, which implies a radius of 25 and 13 solar radii, respectively. The uncertainty is mostly due to the possible emission by very hot dust, and could be significantly reduced by observations at wavelengths shorter than 1.6 microns. The lower limit of T(eff) coincides with the excitation temperature determined by Rubin et al. (1983). However, a third condition exists, for stars exciting H II regions, which relates size and effective temperature of the exciting star to the radio flux from the ionized region. In the case of G333.6 - 0.2, this condition indicates effective temperatures higher than 40,000 K.
Natta Antonella
Oliva Ernesto
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