Optical spectra of zeta Aurigae binary systems. 6: The chromosphere of 22 Vulpeculae

Details Optical spectra of zeta Aurigae binary systems. 6: The chromosphere of 22 Vulpeculae Optical spectra of zeta Aurigae binary systems. 6: The chromosphere of 22 Vulpeculae

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...288..273s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 288, no. 1, p. 273-281

Astronomy and Astrophysics

Astrophysics

4

Absorption Spectra, Chromosphere, Eclipsing Binary Stars, Electron Density (Concentration), Ion Density (Concentration), Ionization, Stellar Winds, Boundary Conditions, Calcium, Data Correlation, Hydrogen, Iron, Line Spectra, Spectrum Analysis

Scientific paper

We present an analysis of chromospheric absorption lines in the zeta Aur binary 22 Vul (G5 Ib-II + B8 V), extracted from observations made during its ingress and total eclipse of 1988 September-October. By means of a modified curve-of-growth technique and an investigation of the Ca II K-line profile, we obtain column densities for atoms and ions at different projected heights and convert them into empirical density models. The total hydrogen and electron densities are estimated from the Fe I/Fe II ratio by applying a simplified ionization equilibrium. We find that the chromosphere of 22 Vul is cool and extended, with an ionization of 2 to 4% at heights between 4 and 8 Gm, and is in many respects very similar to that of zeta Aur. In the Hertzsprung-Russell (HR) diagram the cool-giant region where the primary components of 22 Vul and of the other zeta Aur giants are located is one in which dramatic variations in the properties of the circumstellar material are clearly manifested and where transitions from hot coronae to cool winds occur. Since the zeta Aur systems offer some degree of height resolution of the circumstellar region through the 'binary-star' technique, they are immensely valuable for investigating the very diverse nature of that material. This analysis of the chromosphere of 22 Vul serves to establish some of the essential boundary conditions for such investigations.

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