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2000ApJ...533..959L - Astrophys. J., 533, 959-968 (2000/April-3)
On the transience of circumstellar shells about |b|≥10° OH/IR stars. I. Basic statistics.
LEWIS B.M.
Abstract (from CDS):
There is, however, only one PPN candidate without an OH maser to match to the sample's 118 OH/IR-star color mimics (circumstellar shells with the IR colors of OH/IR stars that do not exhibit 1612 MHz masers), where eight are implied if mimics independently evolve through a PPN phase. Most mimics are therefore likely to be the immediate precursors of OH/IR stars. The average net duration of heavy mass loss in a superwind is then estimated from the ratio between the number of IR sources and PPNs at ∼3700 yr. However, the absence of any O-rich PPNs to match to OH/IR stars and mimics in the Galactic anticenter region (AGC), even though there are two carbon stars and four C-rich PPN with appropriate IR colors there, offers a strong hint that most OH/IR stars in the AGC exit their asymptotic giant branch phase as C-rich PPNs. This carries the direct implication that the superwind phase in high-latitude stars is usually a cyclical phase.
Abstract Copyright: ∼
Journal keyword(s): Stars: Circumstellar Matter - Masers - Radio Lines: Stars - Stars: AGB and Post-AGB
Simbad objects: 127
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