Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ap%26ss.141...45m&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 141, no. 1, Feb. 1988, p. 45-54.
Astronomy and Astrophysics
Astrophysics
12
Line Spectra, Oxygen Spectra, Stellar Envelopes, Stellar Winds, Absorption Spectra, Nitrogen, Silicon, Stellar Models, Supergiant Stars
Scientific paper
The radial velocity variations of the components of some 011, Si In, and Nil lines in P Cyg spectrum are investigated during the period 198 1-1983. All data are analyzed in terms of a model which implies a multiple ejection of shells in the stellar wind. It is shown that the observed phenomenon is not periodic, but it occurs on a time-scale between 110 and 160 days with the most frequently observed length of the cycle of about 110 days. The shells move away from the star with an acceleration that is greater at low velocities than at high ones. The radial velocity variations of Oii, Si iii, and Nil lines agree with these of hydrogen lines if we assume velocity and excitation condition differences inside the shell
Kolka Indrek
Markova Nevena
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