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Title:
EX Hydrae - Physical parameters derived from simultaneous spectroscopy and photometry
Authors:
Gilliland, R. L.
Publication:
Astrophysical Journal, Part 1, vol. 258, July 15, 1982, p. 576-588. (ApJ Homepage)
Publication Date:
07/1982
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
DWARF NOVAE, ECLIPSING BINARY STARS, EPHEMERIDES, ORBITAL ELEMENTS, VARIABLE STARS, X RAY SOURCES, BALMER SERIES, CONTINUOUS SPECTRA, HIGH RESOLUTION, RADIAL VELOCITY, SPECTRAL LINE WIDTH, STELLAR MASS, STELLAR MODELS, STELLAR SPECTROPHOTOMETRY
Comment:
A&AA ID. AAA032.117.004
DOI:
10.1086/160109
Bibliographic Code:
1982ApJ...258..576G

Abstract

Simultaneous photometry and high time resolution spectrophotometry used to determine the orbital characteristics of the eclipsing dwarf nova system EX Hydrae show that the 67-min photometric period appears, spectroscopically, as a modulation of emission-line intensities. A new analysis of the eclipse timing reveals a constant orbital period, while analysis of the 67-min variation shows a significant period increase, and emission-line profiles are found to vary at 1/2 of the 67-min period as well as the orbital period. After a discussion of models for the 67-min variation, standard assumptions concerning the secondary component are found to suggest masses of 1.4 and 0.17 solar masses for the binary components on the basis of a 58 + or - 9 km/sec radial velocity half-amplitude.

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