Optical spectra of Zeta Aurigae systems. IV - The January 1990 eclipse of HR 2554: Detection of chromospheric absorption and extended plasma at approximately 10 exp 5 K

Details Optical spectra of Zeta Aurigae systems. IV - The January 1990 eclipse of HR 2554: Detection of chromospheric absorption and extended plasma at approximately 10 exp 5 K Optical spectra of Zeta Aurigae systems. IV - The January 1990 eclipse of HR 2554: Detection of chromospheric absorption and extended plasma at approximately 10 exp 5 K

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..219s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 1, p. 219-227.

Astronomy and Astrophysics

Astrophysics

16

Chromosphere, Eclipsing Binary Stars, High Temperature Plasmas, Stellar Atmospheres, Stellar Spectra, Visible Spectrum, Absorption Spectra, Hertzsprung-Russell Diagram, Iue, Light Curve, Southern Sky, Stellar Envelopes, Stellar Winds

Scientific paper

Eclipse observations of HR 2554 are presented. These observations were obtained simultaneously during the January 1990 eclipse with ESO telescopes and the IUE satellite. Chromospheric absorption and changes in the circumstellar matter were investigated. Improved system parameters were derived from the light curve. For each of the composite spectra a surrogate primary was subtracted revealing the Ca and Fe line absorption superimposed on the extracted spectrum of the companion. The division in the HR diagram between cool winds and extended cool chromospheres to the right and hotter circumstellar matter to the left is discussed.

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