Optical and infrared pulsations from the HZ Herculis binary system during the 1983 prolonged X-ray low state

Details Optical and infrared pulsations from the HZ Herculis binary system during the 1983 prolonged X-ray low state Optical and infrared pulsations from the HZ Herculis binary system during the 1983 prolonged X-ray low state

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...292..267m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 292, May 1, 1985, p. 267-275. Research sponsored by the U.S. Department of

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16

Infrared Spectra, Pulsars, Stellar Oscillations, Stellar Spectra, X Ray Binaries, Accretion Disks, Bremsstrahlung, Mass Transfer, Power Spectra, Time Series Analysis

Scientific paper

Pulsed infrared and optical flux from HZ Her has been detected during the 1983 prolonged X-ray low state by simultaneous observations with the Lick Observatory Shane 3.1 m and Crossley 91 cm telescopes. The pulsed fluxes in the 1.0-2.5-micron bandpass and the 3200-7500 A bandpass agree in pulse frequency and phase and were measured to be 31 and 13 microJy, respectively. These pulsed fluxes indicate that the reprocessed pulsation spectrum is consistent with optically thin thermal bremsstrahlung radiation with a characteristic temperature of 25,000 K (+25,000; -12,500) which is modulated in intensity. An apparent earth-approaching Doppler velocity of about 65 km/s is observed for these pulsed fluxes; this velocity can be interpreted as pulsed X-ray reprocessing by material in the mass transfer stream between L1 and the outer edge of the accretion disk. Other optical observations made during and before the 1983 prolonged X-ray low state show that the optical pulsations may have been subtly affected by the obscuration responsible for the X-ray low.

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