Condensation of MgS in outflows from carbon stars

Details Condensation of MgS in outflows from carbon stars Condensation of MgS in outflows from carbon stars

2008-03-20

arxiv.org/abs/0803.2994v1

Astronomy and Astrophysics

Astrophysics

9 pages, 7 figures

Scientific paper

10.1051/0004-6361:200809674

The basic mechanism responsible for the widespread condensation of MgS in the outflows from carbon rich stars on the tip of the AGB is discussed with the aim of developing a condensation model that can be applied in model calculations of dust formation in stellar winds. The different possibilities how MgS may be formed in the chemical environment of outflows from carbon stars are explored by some thermochemical calculations and by a detailed analysis of the growth kinetics of grains in stellar winds. The optical properties of core-mantle grains with a MgS mantle are calculated to demonstrate that such grains reproduce the structure of the observed 30 $\mu$m feature. These considerations are complemented by model calculations of circumstellar dust shells around carbon stars. It is argued that MgS is formed via precipitation on silicon carbide grains. This formation mechanism explains some of the basic observed features of MgS condensation in dust shells around carbon stars. A weak secondary peak at about 33 ... 36 $\mu$m is shown to exist in certain cases if MgS forms a coating on SiC.

Affiliated with

Also associated with

No associations

Rating

Condensation of MgS in outflows from carbon stars 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 Condensation of MgS in outflows from carbon stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Condensation of MgS in outflows from carbon stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-578078