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Title:
Time-resolved spectrophotometry of the cataclysmic variable EX Hydrae
Authors:
Kaitchuck, Ronald H.; Hantzios, Panayiotis A.; Kakaletris, Panagiotis; Honeycutt, R. Kent; Schlegel, Eric M.
Affiliation:
AA(Ohio State University, Columbus), AB(Ohio State University, Columbus), AC(Ohio State University, Columbus), AD(Indiana University, Bloomington), AE(Indiana University, Bloomington)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 317, June 15, 1987, p. 765-767, 769-771, 773-777 (2 ff.). (ApJ Homepage)
Publication Date:
06/1987
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
CATACLYSMIC VARIABLES, DWARF NOVAE, ECLIPSING BINARY STARS, EMISSION SPECTRA, STELLAR SPECTROPHOTOMETRY, H BETA LINE, LINE SHAPE, TEMPORAL RESOLUTION
DOI:
10.1086/165325
Bibliographic Code:
1987ApJ...317..765K

Abstract

EX Hya is an unusual, eclipsing dwarf nova. In addition to its 98 min orbital period there is a 67 min photometric period which is also seen in the X-ray portion of the spectrum. The authors present the results of a study based on 264 time-resolved optical spectra. Both the emission-line strengths and widths are strongly modulated with the 67 min period, and the two sides of the emission-line profiles are phase-shifted with respect to each other. The data are consistent with a model of an intermediate polar, where a significant fraction of the line emission originates from accretion funnels above the misaligned magnetic poles of the white dwarf.

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