Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999head....4.0909b&link_type=abstract
American Astronomical Society, HEAD meeting #4, #09.09; Bulletin of the American Astronomical Society, Vol. 31, p.706
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The 1.98-day eclipsing binary AR Lac (HD 210334) is a particularly important RSCVn system because it has shown evidence for extended high temperature structures as well as for compact active regions on at least one of the stars. EUVE spectra have been used to determine the shape of the AR Lac emission measure distribution, revealing a strong emission feature near 6 x 10(6) K. Low metal abundances (by factors of 3 to 4) indicated by previous ASCA spectral modeling grossly change the shape and peak temperature of the radiative loss curve, and thus have strong implications for thermal stability of the corona. We report here preliminary results of our spectroscopic and light curve analyses on the simultaneous observations with ASCA and EUVE obtained in July 1997. The ASCA observations spanned 175 ks and were centered on the longer (250 ks) EUVE pointing; both primary and secondary eclipse were included in the simultaneous observing period.
Brickhouse Nancy S.
Drake Stephen Alan
Dupree Andrea K.
Sanz-Forcada Jorge
Singh Kamal P.
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