Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...407..219h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 407, no. 1, p. 219-231.
Astronomy and Astrophysics
Astronomy
159
A Stars, Accretion Disks, B Stars, Infrared Astronomy, Stellar Envelopes, Stellar Models, Cosmic Dust, Near Infrared Radiation, Nebulae, Pre-Main Sequence Stars, Spectral Energy Distribution
Scientific paper
It is suggested that the near-IR emission in many Herbig Ae/Be stars arises in surrounding dusty envelopes, rather than circumstellar disks. It is shown that disks around Ae/Be stars are likely to remain optically thick at the required accretion rates. It is proposed that the IR excesses of many Ae/Be stars originate in surrounding dust nebulae instead of circumstellar disks. It is suggested that the near-IR emission of the envelope is enhanced by the same processes that produce anomalous strong continuum emission at temperatures of about 1000 K in reflection nebulae surrounding hot stars. This near-IR emission could be due to small grains transiently heated by UV photons. The dust envelopes could be associated with the primary star or a nearby companion star. Some Ae/Be stars show evidence for the 3.3-6.3-micron emission features seen in reflection nebulae around hot stars, which lends further support to this suggestion.
Calvet Nuria
Hartmann Lee
Kenyon Scott. J.
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