Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...146l..23d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 146, no. 2, May 1985, p. L23, L24.
Astronomy and Astrophysics
Astrophysics
31
Planetary Nebulae, Stellar Evolution, Stellar Spectrophotometry, Subdwarf Stars, White Dwarf Stars, Asymptotic Giant Branch Stars, Main Sequence Stars, Space Density
Scientific paper
In view of the direct observational evidence presented here, the immediate progenitors of white dwarfs are the central stars of planetary nebulae in as many as 80 percent of all cases; secondary progenitors being other postasymptotic giant branch objects, to the extent of nearly 20 percent, and posthorizontal branch objects insufficiently massive to climb the asymptotic giant branch, with about 0.7 percent. The combined birth rate of these objects, at 2-3 x 10 to the -12th/cu pc per year, is in satisfactory agreement with the death rate of main sequence stars and the birth rate of white dwarfs.
Drilling John S.
Schoenberner Detlef
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