Surface inhomogenetics on SZ PISCIUM

Details Surface inhomogenetics on SZ PISCIUM Surface inhomogenetics on SZ PISCIUM

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..135d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 1, p. 135-142

Astronomy and Astrophysics

Astrophysics

8

Chromosphere, Eclipsing Binary Stars, F Stars, Faculae, K Stars, Stellar Flares, Brightness Distribution, Optical Emission Spectroscopy, Radial Velocity, Stellar Magnitude, Ultraviolet Photometry, Ultraviolet Spectroscopy

Scientific paper

Ultraviolet and optical data are used to look at surface inhomogeneities on the active close binary system SZ Piscium. Lower chromospheric emission lines such as Mg II h&k, and to a lesser extent the upper chromospheric/lower transition region lines of O I 1305A and C II 1335S show a pronounced decrease when the F star is eclipising the K sub-giant. However, higher temperature lines such as the resonance line of C IV 1550A do not show any change in flux. This suggest the presence of a plage with a high contrast at lower temperatures with a Mg II plage-to-K-star ratio of 5. Alternative explanations are explored. Monitoring of this system in the optical U-band and the ultraviolet lines such as CIV 1550A, indicates frequent high energy 1035-1036 flares.

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