EUVE, ASCA, and XTE observed the eclipsing binary Algol (beta Per) from 1--7 Feb 96. EUVE was continuously pointing at Algol (with the exception of earth block, SAA passages, etc.) for ~ 2 binary orbits, with a net exposure time of 160 ksec, ASCA for ~ 40 ksec net exposure in 4 separate pointings, and XTE for ~ 90 ksec in 45 pointings. The objective of the combined EUV/X-ray observations is to definitively determine the temperature distribution and Fe abundance in the quiescent spectrum, and, with luck, catch a flare or two. In addition, ~ 24 hours of coordinated VLA time were scheduled, with the primary goal of comparing the microwave data with the XTE spectrum to search for evidence of hard X-ray emission characteristic of microflares. The EUVE quicklook lightcurve data in the 70-170 Angstroms \ band show evidence of continual variability, most likely from a combination of geometric effects (i.e. eclipses and rotational modulation) and flaring. One moderate (~ x2) flare is evident in the EUVE data: the flare decay should be visible in the (as yet unreduced) XTE data. The ASCA data were taken largely during quiescent periods, which will be helpful in a combined emission measure and Fe abundance analysis. We will discuss preliminary results from this coordinated campaign, including first attempts at modeling the combined spectra.
American Astronomical Society Meeting Abstracts #188
- Pub Date:
- May 1996