Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...227..542h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 227, no. 2, Jan. 1990, p. 542-552.
Astronomy and Astrophysics
Astrophysics
68
Early Stars, Infrared Radiation, Radio Emission, Star Formation, Stellar Mass, Cosmic Dust, H Ii Regions, Interstellar Matter, Stellar Envelopes, Supermassive Stars
Scientific paper
The broad-band energy distributions of BN-type objects is investigated. The IRAS color indices are within R(12/25) values between 0.0 and 1.0, R(25/60) values between 0.0 and 0.6, and R(60/100) values between -0.2 and 0.2 and separate the BN-type objects from compact H II regions and other IR sources. Also in the NIR two-color diagrams, this separation is very clear. A relation between tan - Si and (K - L) is found which resembles the interstellar extinction law. An averaged broad-band energy distribution from 1 micron to 1300 microns for BN-type objects is given. Bolometric luminosities of individual sources were calculated and appear to be by about 30 percent higher than IRAS luminosities. Spectral indices for the radio continuum emission were determined and used to constrain the physical nature of the ionized regions.
Altenhoff Wilhelm J.
Henning Th
Pfau Werner
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