On the scale height of planetary nebulae

Details On the scale height of planetary nebulae On the scale height of planetary nebulae

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...243..478z&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 243, no. 2, March 1991, p. 478-482.

Statistics

Computation

45

Planetary Nebulae, White Dwarf Stars, Astronomical Models, Computational Astrophysics, Late Stars, Stellar Evolution

Scientific paper

Based on the distribution at high galactic latitudes, the local scale height of planetary nebulae is determined. A value of 250 + or - 50 pc is found, assuming an exponential disk, or 190 + or - 40 pc in case of an isothermal disk. This agrees well with the old stellar disk. The result is considerably higher than earlier determinations; the difference can be explained by the use of statistical distance scales in the earlier work. The majority of the nearby planetary nebulae therefore originates from old stars. The total number of pn in the galactic disk is found to be 23,000 + or - 6,000. The birthrate of planetary nebulae is consistent with the white dwarf birthrate.

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