Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...452..825c&link_type=abstract
Astrophysical Journal v.452, p.825
Astronomy and Astrophysics
Astronomy
28
Accretion, Accretion Disks, Stars: Binaries: Eclipsing, Stars: Pulsars: Individual Name: Hercules X-1, X-Rays: Stars, Stars: Individual Constellation Name: Hercules X-1
Scientific paper
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.
Cheng Fu-Hua
Raymond John C.
Vrtilek Saeqa D.
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