SIMBAD references

1996A&A...315L.221I - Astronomy and Astrophysics, volume 315, L221-224 (1996/11-2)

A detached dust shell surrounding the J-type carbon star Y Canum Venaticorum.


Abstract (from CDS):

This paper reports the first clear detection of a detached dust shell surrounding the prototypical J-type carbon star Y CVn in 90µm and 160µm maps taken with the ISO/ISOPHOT. The projected inner radius of the shell is 180"-190", corresponding to (6.4-7.1)x1017cm at a distance of 250pc. The shell thickness is obtained to be (2-5)x1017cm. The mass-loss rate at the formation of the shell is estimated to be in the range (7-20)x10–6M/yr, about two orders of magnitude higher than the present-day mass-loss rate derived from CO gas observations. The obtained mass in the shell is (4-14)x10–2M. It is concluded that the mass-loss rate decreased by two orders of magnitude on a short time scale 1.4x104 years ago assuming an average shell expansion velocity of 15km/s, and that Y CVn has been staying at the low mass-loss state. The duration of the previous higher mass-loss phase would be at most 2x104 years even if the asymmetry in the shell geometry is taken into account. The evolutionary status of Y CVn is also discussed.

Abstract Copyright:

Journal keyword(s): stars: carbon - stars: evolution - stars: imaging - stars: individual: Y CVn - stars: mass-loss - stars: AGB and post-AGB - dust

Simbad objects: 3

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