Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...171..178t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 171, no. 1-2, Jan. 1987, p. 178-188.
Astronomy and Astrophysics
Astrophysics
38
Planetary Nebulae, Radio Spectra, Red Giant Stars, Stellar Envelopes, Stellar Models, Stellar Winds, Continuous Spectra, Radiant Flux Density, Spectrum Analysis, Stellar Evolution, Stellar Mass Ejection
Scientific paper
An analysis of the radio continuum spectra of 18 compact planetary nebulae, based on published flux densities plus new observations at 327 MHz with the Westerbork Synthesis Radio Telescope, is presented. It is shown that the radio spectra are well represented by a model in which the radio emission arises in a photon-limited, ionized shell of a stellar wind type envelope. A comparison of predicted and observed angular radii indicates a radial density power law in the shell of the form r exp -2. The model also accounts for an evolutionary trend in the radio spectra revealed by a correlation between spectral shape and the linear dimensions of the nebulae. The results suggest that planetary nebulae are ionized shells of stellar wind ejecta produced during the precursor, red giant stage. The derived mass loss rates are typicaly a few 0.00001 solar masses/yr.
Pottasch Stuart R.
Taylor Russ A.
Zhang Cheng-Yong
No associations
LandOfFree
Radio continuum spectra of compact planetary nebulae - A wind-shell model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Radio continuum spectra of compact planetary nebulae - A wind-shell model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio continuum spectra of compact planetary nebulae - A wind-shell model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1621288