Polarimetry of the Protoplanetary Nebula AFGL 2688
- UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
- Anatoly S. Miroshnichenko, Professor (Creator)
- Institution
- The University of North Carolina at Greensboro (UNCG )
- Web Site: http://library.uncg.edu/
Abstract: Our spectroscopic (with resolution R = 75 000) and spectropolarimetric (R = 15 000) observations
with the 6-m telescope of the Special Astrophysical Observatory have enabled us to distinguish
photospheric and circumstellar features in the optical spectrum of the bipolar protoplanetary nebula AFGL
2688 for the first time. The linear polarization of the radiation was measured at 5000–6600 λ. The emission
in the lines of the sodium doublet and the Swan bands is formed in the envelope, and the mechanism
exciting the transitions is resonance fluorescence.We conclude that the circumstellar envelope has a low
density. Features of the structure of the nebula are discussed based on published high-angular-resolution
photometric and polarimetric (HST NICMOS) data.
Polarimetry of the Protoplanetary Nebula AFGL 2688
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Additional Information
- Publication
- Astronomy Reports, Vol. 48, No. 4, 2004, pp. 288–300.
- Language: English
- Date: 2004
- Keywords
- Nebula, Polarimetry, Spectroscopic, Spectropolarimetric