A Multiwavelength Study of RZ Cassiopeiae The XMMNewtonVLA Campaign.pdfVIP

1 A MULTIWAVELENGTH STUDY OF RZ CASSIOPEIAE: THE XMM-NEWTON/VLA CAMPAIGN 1 1 2 M. Audard , J. R. Donisan , and M. G¨udel 1Columbia Astrophysics Laboratory, Columbia University, Mail code 5247, 550 West 120th Street, New York, NY 10027, USA 2Paul Scherrer Institut, Villigen W¨urenlingen, 5232 Villigen PSI, Switzerland 4 0 Abstract regions, with important implications for the structure of 0 XMM-Newton and the VLA simultaneously observed the outer atmospheres. 2 the eclipsing Algol-type binary RZ Cassiopeiae in August In Algol-type systems, the formation of an accretion p 2003. The secondary eclipse (K3 IV companion behind the disk around the primary depends on the location of the e A3 V primary) was placed at the center of the 15-hour ra- binary in the r-q diagram, where r is the radius of the S dio campaign, while the X-ray satellite monitored a full primary in units of the binary separation, and q is the 1 1.2-day orbital period. We present results of the X-ray mass ratio of the secondary to the primary (Peters 1989). 2 and radio campaigns. The X-ray light curve shows signif- In brief, short-period Algols, such as our target RZ Cas, 1 icant modulation probably related to rotational modula- tend to populate