Dust formation of Be stars with large infrared excess

Chien De Lee, Wen Ping Chen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Classical Be stars, in addition to their emission-line spectra, are associated with infrared excess which is attributable to free-free emission from ionized gas. However, a few with exceptionally large near-infrared excess, namely with J - H, and H-Ks both greater than 0.6 mag-and excess emission extending to mid- and far-infrared wavelengths-must be accounted for by thermal emission from circumstellar dust. Evolved Be stars on the verge of turning off the main sequence may condense dust in their expanding cooling envelopes. The dust particles should be very small in size, hence reprocess starlight efficiently. This is in contrast to Herbig Ae/Be stars for which the copious infrared excess arises from relatively large grains as part of the surplus star-forming materials.

Original languageEnglish
Title of host publicationActive OB stars
Subtitle of host publicationstructure, evolution, mass loss, and critical limits
PublisherCambridge University Press
Pages366-371
Number of pages6
EditionS272
ISBN (Print)9780521198400
DOIs
StatePublished - Jul 2010

Publication series

NameProceedings of the International Astronomical Union
NumberS272
Volume6
ISSN (Print)1743-9213
ISSN (Electronic)1743-9221

Keywords

  • Be
  • Infrared: stars
  • Stars: early-type
  • Stars: emission-line
  • Stars: evolution
  • Stars: pre-main-sequence

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