The Very Slow Wind from the Pulsating, Semi-Regular Red Giant, L2 Pup

Details The Very Slow Wind from the Pulsating, Semi-Regular Red Giant, L2 Pup The Very Slow Wind from the Pulsating, Semi-Regular Red Giant, L2 Pup

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.9209j&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #92.09; Bulletin of the American Astronomical Society, Vol. 33, p.1441

Astronomy and Astrophysics

Astronomy

Scientific paper

We have obtained 11.7 μm and 17.9 μm images at the Keck I telescope of the circumstellar dust emission from L2 Pup, one of the nearest (D = 61 pc) mass-losing, pulsating, red giants that has a substantial infrared excess. We propose that the star is losing mass at a rate of { ~}3 {x} 10-7 Msun yr-1. Given its relatively low luminosity ({ ~} 1500 Lsun), relatively high effective temperature (near 3400 K), relatively short period ({ ~} 140 days), and the inferred gas outflow speed of 3.5 km s-1, standard models for dust-driven mass loss do not apply. Instead, the wind may be driven by the stellar pulsations with radiation pressure on dust being relatively unimportant, as described in some recent calculations. L2 Pup may serve as the prototype of this phase of stellar evolution where it could lose { ~}15% of its initial main sequence mass. This work has been partly supported by NASA.

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