view Abstract Citations (42) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS An Archival Study of Hubble Space Telescope Observations of Hercules X-1/HZ Herculis Cheng, F. H. ; Vrtilek, S. D. ; Raymond, John C. Abstract We present an archival study of observations of Her X-1/HZ Her obtained by the Faint Object Spectrograph (FOS) on the Hubble Space Telescope (HST). The optical light curve of HZ Her has previously been modeled as an X-ray heated star (e.g., Bahcall & Bahcall 1972) or an X-ray heated star plus disk (e.g., Gerend & Boynton 1976; Howarth & Wilson 1983a, b). We have utilized the system geometry as modeled by Howarth & Wilson (1983a) and have added blackbody components to our X-ray heating code to allow us to match better the observed slope of the HST/FOS spectrum and the strength of the Balmer jump. By fitting our model to the HST/FOS spectrum obtained at total eclipse (binary phase 0.0), we determine the mean temperature of the unheated star surface to be 8100±240 K consistent with an A7 star. From the best-fit model to the HST/FOS spectrum near the binary phase 0.5, we determine a mass transfer rate Mṡ = (6.5±0.9) x 10-9 Msun yr-1. Publication: The Astrophysical Journal Pub Date: October 1995 DOI: 10.1086/176351 Bibcode: 1995ApJ...452..825C Keywords: ACCRETION; ACCRETION DISKS; STARS: BINARIES: ECLIPSING; STARS: PULSARS: INDIVIDUAL NAME: HERCULES X-1; X-RAYS: STARS; STARS: INDIVIDUAL CONSTELLATION NAME: HERCULES X-1 full text sources ADS | data products SIMBAD (3) MAST (1) ESA (1)
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Cheng et al. (1995) studied this question.