The expanding shells of the stars Rho Leo and Eta ORI

Details The expanding shells of the stars Rho Leo and Eta ORI The expanding shells of the stars Rho Leo and Eta ORI

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977pazh....3..310s&link_type=abstract

Pis'ma v Astronomicheskii Zhurnal, vol. 3, July 1977, p. 310-314. In Russian.

Astronomy and Astrophysics

Astronomy

Stellar Envelopes, Stellar Mass Ejection, Stellar Spectra, Supergiant Stars, Nitrogen, Oao 3, Silicon, Ultraviolet Spectra

Scientific paper

Results are presented for analysis of UV spectra of Rho Leo (B1 Iab) and Eta Ori (B0.5 Ia) obtained over the wavelength range from 955.0 to 1435.5 A by the OAO-3 satellite. More than 200 lines of stellar, shell, and interstellar origin are identified in this spectral region. Shell expansion velocities of the order of 1000 km/s are derived from the Si IV and N V resonance doublets. The column densities of absorbing atoms are computed along with the electron densities and the color temperatures in the Lyman continuum region. Mass-loss rates are estimated from the observed shell expansion velocities, yielding (5 to 8) ten-millionths of a solar mass per year for Rho Leo and (9 to 30) ten-millionths of a solar mass per year for Eta Ori.

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