Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237..491k&link_type=abstract
Astrophysical Journal, Part 1, vol. 237, Apr. 15, 1980, p. 491-495.
Astronomy and Astrophysics
Astrophysics
11
Planetary Nebulae, Spatial Distribution, Stellar Evolution, Stellar Mass, Stellar Temperature, Distance, Hertzsprung-Russell Diagram, Planetary Mass, Radial Velocity, Stellar Mass Ejection, Temperature Dependence, White Dwarf Stars
Scientific paper
Stellar and nebular masses in the planetry nebulae regime of the H-R diagram is investigated by examining quantities related to the stars' temperatures only, thus avoiding any dependence on the distances to the nebulae. A nebular excitation parameter, He(2+)/He is used, which is proportional to the temperature of the central star. Both of these are compared with the absolute value of the radial velocity of the nebula with respect to the local standard of rest, and with absolute distance from the galactic plane. Results show that higher mass leads to higher maximum effective temperature of the planetary nucleus; it is also demonstrated on independent empirical grounds that stars of different mass follow different evolutionary tracks through this region of the H-R diagram. From a comparison of the maximum stellar temperature found in the halo with theoretical evolutionary tracks, it is also indicated that stars in the neighborhood of one solar mass lose a total of nearly half that mass before becoming white dwarfs, and that the halo white dwarfs now being formed have masses of about 0.5 solar masses.
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