The FUSE Survey of Algol-Type Interacting Binary Systems

Details The FUSE Survey of Algol-Type Interacting Binary Systems The FUSE Survey of Algol-Type Interacting Binary Systems

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916212p&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #162.12; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

A survey of Algol binaries at random phases is currently being carried through with the FUSE spacecraft as part of the FUSE survey and supplemental program. A similar program was undertaken in FUSE Cycle 3. Both programs have produced multiple observations of 12 Algol systems with periods ranging from 1.2 37 d and include direct-impact and disk systems. We report on the status of the program. The absence of O VI absorption in the systems observed to date allows us to place an upper limit on the column density and temperature of the High Temperature Accretion Region, HTAR ( 100,000 K) confirmed in some Algols from earlier IUE data. The HTAR plasma component appears to be distinct from an O VI-emitting polar plasma discovered in FUSE totality observations of RY Per, V356 Sgr, and TT Hya. New observations of the direct-impact system U Cep have provided more information on the geometry and mass flow (including a splash plasma) in the vicinity of a hot spot at phase 0.90 that was discovered earlier. The extent of disk asymmetries in the long period ( 33 d) systems SX Cas and RX Cas is discussed. Models for direct-impact and the disk systems will be presented. The authors appreciate support from NASA grants NAG5-12253, NNG04GL17G, and NAS5-32985.

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