Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...292..670h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 292, May 15, 1985, p. 670-675.
Astronomy and Astrophysics
Astrophysics
16
Orbital Velocity, Radial Velocity, Stellar Spectra, X Ray Binaries, Balmer Series, Emission Spectra, Spectral Line Width
Scientific paper
New spectroscopic data are presented of HZ Her, which have about 2 A-resolution, and cover both 1.7 day orbital and 35 day (precessional?) periods. Data include measures of principal absorption-line velocities and asymmetries, and emission-line velocities and intensities. Orbital parameters derived from Balmer and He I velocities are found to be modulated over half the 35 day period of the system. This can be generally understood in terms of a variable X-ray heating, modulated by a thick precessing disk about the secondary. Models for such a variable heating fit the principal effects and yield a primary star orbital velocity of 83 + or - 3 km/s. This implies masses of 1.91 and 0.93 solar mass for the two stars the emission-line features are found to vary in velocity with an amplitude of about 105 km/s and a phase shift of 0.3 with respect to the absorption, suggesting a principal origin above the trailing side of the heated face of the primary star. Line intensity variations are discussed and lend support to these conclusions.
Crampton David
Fisher Wesley A.
Gibson E. M.
Hutchings John B.
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