Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.0905s&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #09.05; Bulletin of the American Astronomical Society, Vol. 26, p.872
Astronomy and Astrophysics
Astronomy
2
Scientific paper
X1820-303 is a low-mass binary situated in the core of the globular cluster NGC6624. Its orbital period of 11 minutes is the shortest known of any LMXB, and in addition the system shows QPO and burst behavior. X1820-303 was observed by ASCA on 1993 October 6 05:14 UT for 22 hrs. The deadtime-corrected source flux of 3.7times 10(37) erg cm(-2) s(-1) (at 6.4 kpc) indicates that X1820-303 was in a low state during the observation. The 3% orbital modulation of the source was clearly detected in periodogram analysis of the light curve. The 0.6--11 keV GIS2 and GIS3 spectra were fitted simultaneously with various models, and a reasonable fit (chi (2) =696/426=1.63) was obtained using a combination of Comptonization with kTee=3.57+/-0.24 keV and tau =13.5+/-0.6, plus a blackbody with kTbb=0.76+/-0.02 keV, the blackbody making up 13% of the total flux. Iron K emission at 6.7 keV was observed with equivalent width 60+/-20 eV, the first unambiguous detection of K-line emission in this source. Phase-selected spectroscopy and a refined ephemeris determination are in progress.
Dotani Tadayasu
Mitsuda Kazu
Smale Alan P.
Zylstra Gregory
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