1420 and 408 MHz observations of the planetary nebulae BD + 30 deg 3639 and AFGL 618

Details 1420 and 408 MHz observations of the planetary nebulae BD + 30 deg 3639 and AFGL 618 1420 and 408 MHz observations of the planetary nebulae BD + 30 deg 3639 and AFGL 618

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103..538l&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, Feb. 1992, p. 538-543, 688. Research supported by NSERC.

Astronomy and Astrophysics

Astronomy

6

H I Regions, Planetary Nebulae, Radio Astronomy, Astronomical Spectroscopy, Circular Polarization, Interstellar Chemistry, Stellar Envelopes, Ultrahigh Frequencies

Scientific paper

1420 MHz spectral line and continuum observations as well as 408 MHz continuum observations have been made toward the compact planetary nebulae BD + 30 deg 3639 and AFGL 618 with the Synthesis Telescope of the Dominion Radio Astrophysical Observatory. These observations were intended to detect possible circumnebular H I in AFGL 618 and to detect an anticipated extended component of the previously detected circumstellar H I of BD + 30 deg 3639. Neither the planetary nebula AFGL 618 nor the bipolar nebula M1-92 were detected by 1420 or 408 MHz continuum observations, or by 1420 MHz spectroscopic observations. The anticipated extended H I of BD + 30 deg 3639 was not detected, indicating that the H I distribution of this nebula is significantly more compact than that of the planetary nebula IC 418. Compact, dense planetary nebulae such as BD + 30 deg 3639 may have circumnebular envelopes that are primarily molecular rather than atomic.

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