The active phase of the hot component of Z Andromedae

Details The active phase of the hot component of Z Andromedae The active phase of the hot component of Z Andromedae

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...442..366f&link_type=abstract

The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 442, no. 1, p. 366-380

Astronomy and Astrophysics

Astrophysics

43

Radio Observation, Stellar Luminosity, Stellar Magnitude, Stellar Mass Ejection, Symbiotic Stars, Ultraviolet Spectra, Visible Spectrum, Continuous Spectra, Energy Spectra, Light Curve, Line Spectra, Spectrum Analysis, Stellar Spectrophotometry

Scientific paper

Z And is considered the prototype of the symbolic class. Quiescence data show that its hot component lies close to the central stars of planetary nebulae in the H-R diagram. This system underwent an outburst at the beginning of 1984. The activity phase lasted for approximately 900 days with two maxima in 1984 April and 1985 December. In this work we present UV and radio data which cover the entire activity phase, as well as part of the pre- and post-outburst period. All the evidence indicated that the two maxima are different unrelated outbursts in which an optically thick shell was ejected at moderately high velocities of the order of 200-300 km/s. The two outbursts were characterized by a general increase at all the wavelength ranges (except in the IR). In the UV there is a broadening of all the emission lines, and a change in the shape of the continuum, which became cooler. The behavior of lines of different ionization levels shows that the shell ejected in the second outburst was more massivce, leading to a substantial blocking of the UV radiation and the subsequent effects on the high-ionization lines.

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