Radio and optical studies of compact planetary nebulae

Details Radio and optical studies of compact planetary nebulae Radio and optical studies of compact planetary nebulae

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...232..195t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 232, no. 1, June 1990, p. 195-202.

Astronomy and Astrophysics

Astrophysics

7

Hydroxyl Emission, Planetary Nebulae, Radio Spectra, Visible Spectrum, Angular Distribution, Emission Spectra, Line Spectra

Scientific paper

A search was made for 18 cm OH emission from five planetary nebulae which have small angular sizes. No OH emission was detected from the sources in the sample which included IC 4997, previously considered as a provisional OH emitter. Upper limits to the 1667 and 1612 MHz line radiation of IC 4997 were obtained. In spite of no detections of the OH-lines, the continuum VLA map in the 1667 MHz band shows an elongated structure of IC 4997 which has never been previously resolved. Highly resolved emission-line profiles of the samples may give a clue to distinguish intrinsically compact PNe from apparently stellar planetaries. The profiles of M 1-5, M 3-27, IC 4997, and Vy 2-2 reveal that they are true compact PNe.

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