The Dust Envelope of R Cas

Details The Dust Envelope of R Cas The Dust Envelope of R Cas

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001arep...45..510w&link_type=abstract

Astronomy Reports, Volume 45, Issue 7, July 2001, pp.510-516

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The spectral energy distribution in the far infrared and the shape of a broad emission band in the spectrum of R Cas at 9 13 µm can be reproduced in a model with a dust envelope consisting of approximately half amorphous olivine (Mg0.8Fe1.2SiO4) and half amorphous aluminum-oxide grains (Al2O3), with a small admixture of spinel grains (MgAl2O4). The dust envelope’s optical depth τ(50 µm) is ≈5×10-3 [τ(1.25 µm)≈0.07 for a gr≈0.05 µm], and its mass within r≤0.025 pc M dust is ≈8×10-6 M &sun;. The index α in the power-law radial dust distribution, n d ∝(R +/r)α, is ≈1.8. Over the last several thousand years, the mass-loss rate of R Cas has been decreasing as &
$dot M(t) ~ t(0.2)
; (where time is measured backward from the present). This probably implies that R Cas experienced a thermal helium flare several thousand years ago. If M gas/M dust≈200 (where M gas is the gas mass), the mean mass-loss rate of the star is &
dot M ≈ 6 × 10({) - 7} M_ &sun; /yr$
; .

Affiliated with

Also associated with

No associations

Rating

The Dust Envelope of R Cas 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 The Dust Envelope of R Cas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Dust Envelope of R Cas will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1774321