Radio Continuum and Recombination Line Observations of the Polypolar Planetary Nebula NGC 2440

Details Radio Continuum and Recombination Line Observations of the Polypolar Planetary Nebula NGC 2440 Radio Continuum and Recombination Line Observations of the Polypolar Planetary Nebula NGC 2440

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...515..633v&link_type=abstract

The Astrophysical Journal, Volume 515, Issue 2, pp. 633-639.

Astronomy and Astrophysics

Astronomy

3

Planetary Nebulae: Individual (Ngc 2440), Radio Lines: Ism

Scientific paper

H92alpha and He92alpha recombination lines and lambda3.6 cm continuum observations have been carried out with the Very Large Array (synthesized beam 6.8"x4.2", PA 74 deg) toward the polypolar planetary nebula NGC 2440. The H92alpha and He92alpha lines have been detected, for the first time in this nebula, over a region of theta~=14^'' around its geometric center. The lambda3.6 cm continuum emission is detected over a region of ~=65^''x40^'', similar in extent to the optical emission. Physical parameters of the nebula have been derived for the region in which the recombination lines were detected. From the line to continuum ratio, an electron temperature of ~=16,000 K and a single ionized helium abundance Y^+~=0.14 are obtained. A relative extinction map of NGC 2440 has also been obtained from the ratio of the lambda3.6 cm continuum and Hα images. A higher relative extinction in the central region traces the dense and dusty environment of an apparent central ``toroid.'' The velocity field obtained from the H92alpha line suggests that the central toroidal structure has a distorted, noncircular shape. The polypolar characteristics of this nebula are discussed and compared with those of similar objects.

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