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Title:
Studies of bipolar nebulae. IV - MZ 3 /= PK 331 - 1 deg 1/
Authors:
Cohen, M.; Kunkel, W.; Lasker, B. M.; Osmer, P. S.; Fitzgerald, M. P.
Affiliation:
AA(Observatorio Interamericano de Cerro Tololo, La Serena, Chile), AB(Observatorio Interamericano de Cerro Tololo, La Serena, Chile), AC(Observatorio Interamericano de Cerro Tololo, La Serena, Chile), AD(Observatorio Interamericano de Cerro Tololo, La Serena, Chile)
Publication:
Astrophysical Journal, Part 1, vol. 221, Apr. 1, 1978, p. 151-153, 155-162. Research supported by the National Research Council of Canada and University of Waterloo (ApJ Homepage)
Publication Date:
04/1978
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL SPECTROSCOPY, EMISSION SPECTRA, INFRARED ASTRONOMY, LINE SPECTRA, NEBULAE, ABUNDANCE, RADIO SPECTRA, STAR DISTRIBUTION, UBV SPECTRA
Comment:
A&AA ID. AAA021.134.016
DOI:
10.1086/156013
Bibliographic Code:
1978ApJ...221..151C

Abstract

Optical photography and spectroscopy of the bipolar nebula Mz 3 and its exciting star are combined with infrared observations and preexisting radio data. Elemental abundances are obtained for the bright lobes of this nebula. The nebula is characterized by an electron temperature of 17,000 K and an electron density of 18,000 per cu cm, from the forbidden emission lines, and an overall mean density of 2300 per cu cm. The spectral type of the exciting star is O9.5 or B0. Multiaperture infrared observations and star counts around Mz 3 strongly suggest the existence of a circumstellar dust and gas disk which, in other bipolar nebulae, has only been inferred from the overall morphology. It is suggested that Mz 3 may represent a protoplanetary nebula

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