Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...230..419h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 230, no. 2, April 1990, p. 419-430. Research supported by the Lockheed Indepen
Astronomy and Astrophysics
Astrophysics
21
Eclipsing Binary Stars, Emission Spectra, Flare Stars, Light Curve, Stellar Flares, Exosat Satellite, Iue, M Stars, Ultraviolet Spectra, X Ray Astrophysics Facility
Scientific paper
The eclipsing spectroscopic binary YY Geminorum has been observed at optical, ultraviolet, and X-ray wavelengths for rotational modulation, eclipse variability, and flaring. The epoch T(phi = 0) = JD 2425698.3561, and the phase P = 0.81428224 d. The quiescent level of Mg II emission is remarkably steady during the three-year observing interval, with F(Mg II) roughly 3.6 x 10 to the -12th erg/sq cm/s. Both stars appear to have identical Mg II surface fluxes, with F roughly 1.8 x 10 to the 6th erg/sq cm/s. Both stars appear to be covered with evenly distributed Mg II emitting regions consistent with the proposition of Doyle (1987) that saturation of the Mg II lines occurs for stars having P less than 4 d, implying that such stars are entirely covered by plage. The transition region lines show significantly more rotational modulation and/or secular variability than Mg II. Both Mg II and the transition region lines show preflare and postflare enhancement.
Gibson David M.
Haisch Bernard M.
Rodono' Marcello
Schmitt Juergen H. M. M.
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