Probing the Mass-Loss History of VY CMa

Details Probing the Mass-Loss History of VY CMa Probing the Mass-Loss History of VY CMa

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..378..285d&link_type=abstract

Why Galaxies Care About AGB Stars: Their Importance as Actors and Probes. ASP Conference Series, Vol. 378, proceedings of the co

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Mass loss plays a dominant role in the evolution of low-mass stars while they are on the Asymptotic Giant Branch (AGB). Recent studies have hinted towards the importance of time variability of the mass-loss rates of such objects. Likewise, more massive stars (MZAMS ⪆ 8 M&sun;) may pass through a red supergiant phase and lose mass in a similar manner. By modelling the full line profiles of low excitation CO transitions emitted in the circumstellar envelope (CSE), we have studied the mass-loss history of the well-studied supergiant VY CMa. We show that this source underwent a phase of high mass loss (˜2.8 × 10-4 M&sun;/yr) some 1000 yr ago. This phase lasted some 100 yr, and was followed by a low mass-loss phase (˜ 1 × 10-6 M&sun;/yr) taking some 800 yr. The current mass-loss rate is estimated to be on the order of 1 × 10-4 M&sun;/yr.

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