Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.210..159t&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 210, no. 1-2, p. 159-161 (IAU Colloquium 134)
Astronomy and Astrophysics
Astrophysics
1
Line Spectra, Planetary Nebulae, Stellar Envelopes, Supergiant Stars, Astrophysics, F Stars, Spectrum Analysis, Stellar Evolution
Scientific paper
In this report the results of spectroscopic observations on selected F supergiant stars as the candidates of proto-planetary nebulae (PPNs) are presented. Volk and Kwok (1989) selected nearly one hundred new candidates of PPNs based upon the scenario on the evolution of them. They summarized four classes of stars which should be the PPNs and are described in various papers. These are (1) High galactic latitude supergiants, (2) Nonvariable OH/IR stars, (3) Low color temperature infrared objects, and (4) R CrB. In order to examine the extended envelope of the PPNs we have started our project to obtain the H alpha profile which should give us some clue to the structure of the envelope. We are mainly concerned with F supergiant stars. Our sample objects are mostly classified as pulsating or semiregular variables.
Takeuti Mine
Tamura Shun
Zalewski Jan
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