Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....69...73b&link_type=abstract
Astronomy and Astrophysics, vol. 69, no. 1, Sept. 1978, p. 73-84. Research supported by the Nederlandse Organisatie voor Zuiver
Astronomy and Astrophysics
Astronomy
23
Infrared Astronomy, Planetary Nebulae, Stellar Envelopes, Stellar Mass Accretion, Stellar Spectra, Cosmic Dust, Graphite, Mass Flow, Radiative Transfer, Silicates, Stellar Evolution, Stellar Models
Scientific paper
A simple model of 'accreting young stars' that can explain the IR spectra of Becklin-Neugebauer-type (BN-type) sources is presented. The IR spectrum emerging from a large dust sphere that surrounds a pointlike energy source is calculated for graphite and silicate dust and a dust-density variation corresponding to a cloud in free-fall collapse. The equation of radiative transfer and two equations of thermal equilibrium, one for each kind of dust, are solved simultaneously, taking into account the attenuation of the radiation emerging from the shell by dust in the surrounding parent cloud. The model spectra are fitted to the BN object, OMC 2/IRS 3, RCW 57/IRS 1, and Mon R2/IRS 2. Several sets of parameters are found to produce equally good fits, but models with low and high luminosities are shown to be dynamically impossible. It is tentatively concluded that BN-type objects are early-type stars at the very end of their accretion phase.
Bedijn P. J.
de Jong Teije
Habing Harm J.
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