Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262..511e&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 2, p. 511-520.
Astronomy and Astrophysics
Astronomy
5
Ginga Satellite, Globular Clusters, X Ray Binaries, X Ray Spectra, Accretion Disks, Light Curve, Neutron Stars, Stellar Spectra
Scientific paper
We present the first spectral observations obtained by Ginga of the low-mass X-ray binary source X1820-303 located in the globular cluster NGC 6624. Two two-component spectral models are found to provide good fits to the data: a bremsstrahlung component and a blackbody, or a power law with exponential cut-off and a blackbody. After considering the importance of Comptonization for the spectral and temporal behavior, the power law plus blackbody model is found to provide simple explanations for many of the observed features present in our data. By studying the variation in the amplitude of the 685-s binary period with source luminosity, it is possible to gain some insight into the source geometry. This reveals that our line of sight to X1820 - 303 is close to some 'critical' angle. Gravitationally induced shocks in the rim of the accretion disk may cause the height of the rim to vary with azimuthal angle, resulting in the quasi-sinusoidal X-ray orbital modulations.
Cruise A. M.
Ercan Nihal E.
Kellett Barry J.
Saygili K.
No associations
LandOfFree
GINGA observations of X1820 - 303 in the globular cluster NGC 6624 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 GINGA observations of X1820 - 303 in the globular cluster NGC 6624, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and GINGA observations of X1820 - 303 in the globular cluster NGC 6624 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1682512