Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...500l..17p&link_type=abstract
Astrophysical Journal Letters v.500, p.L17
Astronomy and Astrophysics
Astronomy
15
Accretion, Accretion Disks, Stars: Binaries: Close, Stars: Circumstellar Matter, Ultraviolet: Stars
Scientific paper
The first results from ORFEUS-SPAS II observations of five Algol-type binary systems obtained during the shuttle mission STS-80 in 1996 November/December are reported. Single spectra covering 900-1220 A of AU Mon, Z Vul, U CrB, and TX UMa were acquired with the Berkeley spectrograph. TT Hya was observed at three phases (0.19, 0.63, and 0.95) to study mass flow and to investigate asymmetry in the circumstellar material in the system. O VI was not detected in any of the binaries, which allows us to place an upper limit on Tion in the high-temperature plasma seen in Algol-type binaries. Circumstellar material, presumably associated with the accretion disk, was detected in Fe III (UV1) in AU Mon. We estimate a particle density in the range 108-109 cm-3 for the region of the disk sampled during the observations. Evidence for mass infall was found in the phase 0.95 spectrum of TT Hya. From the additional (redshifted) absorption in N II (1085 A) and N I (1135 A), we find evidence for superionization in this plasma and estimate a lower limit of 10-12 Msolar yr-1 for the current infall rate.
Peters Gerladine J.
Polidan Ronald S.
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