Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..554f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 2, p. 554-560
Astronomy and Astrophysics
Astrophysics
16
Asymptotic Giant Branch Stars, Halos, Interstellar Matter, Planetary Nebulae, Stellar Envelopes, Stellar Winds, Thermal Shock, Stellar Evolution, Stellar Models
Scientific paper
We explore the hypothesis that the shells and halos of planetary nebulae (PNe) are formed during multiple phases of enhanced mass loss (superwinds). These superwinds occur on the Asymptotic Giant Branch (AGB) and are terminated by thermal pulses. Using recent results from models of AGB star evolution by Vassiladis & Wood (1993) and published data for halos of PNe we compare the theoretical times between thermal pulses with the observed dynamical times derived from halo separations for small but carefully selected sample of PNe. We find that the theoretical and observational time scales are within an order of magnitude from each other. Considering the large experimental error, mainly due to uncertanties in distances, this an encouraging result. However, a larger sample of PNe halos are needed to prove that multiple superwinds are responsible for PNe halos.
Balick Bruce
Frank Alejandro
van der Veen E. C. J. W.
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