Abstract
view Abstract Citations (173) References (74) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Excess Infrared Emission of Herbig Ae/Be Stars: Disks or Envelopes? Hartmann, Lee ; Kenyon, Scott J. ; Calvet, Nuria Abstract 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. Publication: The Astrophysical Journal Pub Date: April 1993 DOI: 10.1086/172507 Bibcode: 1993ApJ...407..219H Keywords: 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; Astrophysics; ACCRETION; ACCRETION DISKS; STARS: CIRCUMSTELLAR MATTER; STARS: EMISSION-LINE; BE; STARS: PRE--MAIN-SEQUENCE full text sources ADS | data products SIMBAD (23) MAST (1)
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