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Title:
Observations of the SW Sextantis star UU Aquarii
Authors:
Hoard, D. W.; Szkody, Paula; Still, M. D.; Smith, Robert C.; Buckley, D. A. H.
Affiliation:
AA(Washington, Univ., Seattle), AB(Washington, Univ., Seattle), AC(St. Andrews, Univ.), AD(Sussex, Univ.), AE(South African Astronomical Observatory)
Publication:
Royal Astronomical Society, Monthly Notices, vol. 294, p. 689 (MNRAS Homepage)
Publication Date:
03/1998
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL SPECTROSCOPY, CATACLYSMIC VARIABLES, STELLAR MASS ACCRETION, ECLIPSING BINARY STARS, STELLAR SPECTRA, ACCRETION DISKS, EMISSION SPECTRA, ABSORPTION SPECTRA
DOI:
10.1046/j.1365-8711.1998.01321.x
Bibliographic Code:
1998MNRAS.294..689H

Abstract

We present 14 nights of medium resolution (1-2 A) spectroscopy of the eclipsing cataclysmic variable UU Aquarii obtained during a high accretion state in 1995 August-October. UU Aqr appears to be an SW Sextantis (SW Sex) star, as noted by Baptista, Steiner, and Horne, and we discuss its spectroscopic behavior in the context of the SW Sex phenomenon. Emission-line equivalent width curves, Doppler tomography, and line profile simulation provide evidence for the presence of a bright spot at the impact site of the accretion stream with the edge of the disk, and a nonaxisymmetric, vertically and azimuthally extended absorbing structure in the disk. The absorption has maximum depth in the emission lines around orbital phase 0.8, but is present from phi = 0.4 to phi = 0.95. An origin is explored for this absorbing structure (as well as for the other spectroscopic behavior of UU Aqr) in terms of the explosive impact of the accretion stream with the disk.

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