Variable extinction in HD 45677 and the evolution of dust grains in pre-main-sequence disks

Details Variable extinction in HD 45677 and the evolution of dust grains in pre-main-sequence disks Variable extinction in HD 45677 and the evolution of dust grains in pre-main-sequence disks

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...432..753s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 432, no. 2, p. 753-762

Astronomy and Astrophysics

Astronomy

27

A Stars, Accretion Disks, B Stars, Infrared Astronomy, Interstellar Extinction, Pre-Main Sequence Stars, Spectral Energy Distribution, Stellar Evolution, Ultraviolet Astronomy, Dust, Optical Properties, Stellar Envelopes

Scientific paper

Changes in the UV extinction and IR emission were sought in the Herbig Ae/Be star candidate HD 45677 (= FS CMa) by comparing UV, optical, and IR observations made approximately 10 yr apart. HD 45677 varied significantly, becoming more than 50% brighter in the UV and optical than it was a decade ago. A comparison of the observations between epochs indicates that if the variations are due to changes in dust obscuration, the dust acts as a gray absorber into the near-IR and must be depleted in grains smaller than 1 micron. This is similar to the results obtained on the circumstellar disks of stars like Vega and Beta Pic, and suggests that radiation pressure may be responsible for the small-grain depletion. In addition, the total IR flux seems to have declined, indicating a decrease in the total mass of the dust envelope that contributes to the IR emission in this part of the spectrum. Due to the anomalous nature of the extinction, the use of normal extinction curves to deredden the spectral energy distributions of stars with circumstellar dust may lead to significant errors and should be used with great caution.

Affiliated with

Also associated with

No associations

Rating

Variable extinction in HD 45677 and the evolution of dust grains in pre-main-sequence disks does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Variable extinction in HD 45677 and the evolution of dust grains in pre-main-sequence disks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable extinction in HD 45677 and the evolution of dust grains in pre-main-sequence disks will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1788189