Giants with infrared excess.

Details Giants with infrared excess. Giants with infrared excess.

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...323..513p&link_type=abstract

Astronomy and Astrophysics, v.323, p.513-523

Statistics

27

Circumstellar Matter, Stars: Evolution, Stars: Late-Type, Stars: Statistics, Infrared: Stars

Scientific paper

We have correlated optical and infrared catalogs in order to extract a large sample of luminosity class III stars with known infrared flux densities. For a non-negligible fraction of G and K giants, a far-infrared excess emission was found, starting beyond 25μm. An explanation in terms of present-day mass loss thus becomes unlikely, since the dust should then be warmer and the excess emission less far in the infrared. We believe that the far-infrared excesses of these objects, most likely first-ascent giants, are related to the Vega phenomenon. The dusty disks around these stars, gradually cooled down during their main-sequence phase, could be reheated once the star leaves the main sequence and enters the luminous post-main-sequence phase. The fairly large sample we constructed enables us to derive an estimation for the occurrence of excesses. This fraction of G or K giants with far-infrared excess appears to be distinctly smaller than among main-sequence stars. Since the higher radiation field of giants could lead to a larger evaporation rate of the circumstellar debris, this fact does not conflict with our hypothesis.

Affiliated with

Also associated with

No associations

Rating

Giants with infrared excess. 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 Giants with infrared excess., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Giants with infrared excess. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1183777