Issue |
A&A
Volume 412, Number 3, December IV 2003
|
|
---|---|---|
Page(s) | 791 - 798 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20031246 | |
Published online | 08 December 2003 |
The correlation between planetary nebula morphology and radio brightness temperatures
Instituto de Astronomia y Meteorologia, Av. Vallarta No. 2602, Col. Arcos Vallarta, CP 44130 Guadalajara, Jalisco, Mexico
Corresponding author: jpp@udgserv.cencar.udg.mx
Received:
18
June
2003
Accepted:
8
August
2003
We have used model central star evolutionary tracks to evaluate the
expected variation of 5 GHz brightness temperatures TB in planetary
nebulae. Using these results, and previously derived central star mass
functions, we find that there should be a correlation between TB and the
mean central star mass , and also between TB and nebular
morphology.
An analysis of the available observational results suggests that such a
correlation between TB and nebular morphology does indeed exist.
Bipolar nebulae appear to be concentrated towards high brightness
temperatures, whilst circular sources tend to possess lower brightness
temperature shells. Elliptical sources are present (and common) at all
values of TB. There are differences however between the observed and
deduced morphological variations, and these enable us to place
constraints upon the progenitor masses of the nebulae. In particular, it is
clear that higher mass progenitors are likely to give rise to both bipolar
and elliptical outflows; a result which is consistent with analyses of
nebular abundances, Zanstra temperatures, and line excitations.
Key words: planetary nebulae: general / ISM: jets and outflows / stars: evolution
© ESO, 2003
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