Bibcode
Villaver, Eva; Manchado, A.; García-Segura, Guillermo; Stanghellini, Letizia
Referencia bibliográfica
Planetary Nebulae in our Galaxy and Beyond, Proceedings of the International Astronomical Union, Symposium #234. Edited by Michael J. Barlow and Roberto H. Méndez. Cambridge: Cambridge University Press, 2006., pp.333-336
Advertised on:
0
2006
Número de citas
2
Número de citas referidas
2
Descripción
Planetary Nebula (PN) shells and AGB circumstellar envelopes evolve
under a wide range of external conditions, from the high ISM densities
found in the Galactic plane, to the rarefied and hot intracluster medium
where the systemic velocity of the star can be as high as 2000 km
s-1. We explore the effects that the external pressure and/or
stellar systemic velocity have on the observable properties of PNe. We
investigate how the mass and size of the PN halos are reduced when the
star is moving with respect to the external medium. We have studied as
well how the mass of the circumstellar envelope is fed by ISM material
when high ISM densities characteristic of the Galactic plane are
considered. By studying the evolution of PNe in the intracluster medium
in Virgo, we infer shorter PN lifetimes than what is usually adopted.
This has important implications, since the assumed PN lifetime strongly
affects the fraction of intracluster light derived from PN studies.