Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.1004x&link_type=abstract
American Astronomical Society, 186th AAS Meeting, #10.04; Bulletin of the American Astronomical Society, Vol. 27, p.826
Astronomy and Astrophysics
Astronomy
2
Scientific paper
ASCA observations of Hercules X-1 obtained in August 1994 during the ``main-on'' state of the 35-day cycle show the system back in its ``normal'' state following the anomalous low state (X-ray flux down by a factor of 50 from expected) seen by ASCA a year earlier (Vrtilek \etal 1994). The continuum emission is well fit by a power-law with photon index alpha = 0.98 +/-0.01 and a blackbody at 0.11 +/- .01 keV consistent with previous ``normal'' state observations. Strong spectral features are observed at 6.43 +/-0.03 and 0.91 +/-0.04 keV that can be attributed to Fe K-shell and L-shell emission. The strength of the Fe K shell emission and the black-body component change dramatically as a function of pulse phase. The X-ray pulse profile shows double-peak structure in both the main pulse and the interpulse; the latter has been seen previously only during the ``short-on'' state. This profile can be explained in terms of a thick funnel-shaped X-ray emission beam that sweeps past the observer.
Boroson Bram
McCray Richard
Vrtilek Saeqa D.
Xu Chun
No associations
LandOfFree
Pulse-phase Spectroscopy of HER X-1 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Pulse-phase Spectroscopy of HER X-1, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pulse-phase Spectroscopy of HER X-1 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-881951