Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aca....43..381s&link_type=abstract
Acta Astronomica, vol. 43, no. 4, p. 381-388
Astronomy and Astrophysics
Astronomy
2
Galactic Bulge, Monte Carlo Method, Planetary Nebulae, Stellar Evolution, Stellar Models, Stellar Mass, Very Large Array (Vla)
Scientific paper
A new method of analysis of the planetary nebula (PN) phenemenon is proposed, in which the observations of a complete sample of PN in the Galactic bulge (GBPN) are compared to simulated samples. Such an approach will provide important tests for the theory of evolution of planetary nebulae and their nuclei. In the framework of the presently adopted models for the PN evolution, we show how the average properties of the GBPN observed with the Very Large Array (VLA) are biased with respect to those of the parent PN populations compatible with the observational data. We find that, assuming that the PN nuclei evolve according to the Schoenberner tracks, the central star mass distribution for the observable GBPN is narrow (standard deviation of less than 0.05 solar mass) and centered on value equal to 0.6 solar mass or less. We show that a campaign of systematic measurements of the GBPN expansion velocities will lead to useful constraints to the models. We also show how some of the widespread ideas on PN (e.g. the usual interpretation of the nebular mass-radius relation) break down with a more careful analysis taking explicitely into account the observational selection effects.
Stasinska Grazina
Tylenda Romuald
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