Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasj...51...39t&link_type=abstract
Publications of the Astronomical Society of Japan, v.51, p.39-44.
Astronomy and Astrophysics
Astronomy
15
Radiation Mechanisms, Stars: Individual (Ax J18428-0423), Stars: White Dwarfs, X-Rays: Spectra
Scientific paper
A new transient X-ray source, AX J1842.8-0423, was discovered with ASCA in 1996 October in the Scutum arm region. The source exhibited an absorption-corrected 2--10 keV flux of 5.2times 10^{{-12}} erg s^{{-1}} cm^{{-2}} , with insignificant intensity variability. The continuous spectrum is approximated by a power-law of photon index 2.9, absorbed by a hydrogen column of N_H ~ 5 x 10^{{22}} cm^{{-2}} . The spectrum also exhibits the Fe-K emission line with an extremely large equivalent width of ~ 4000 eV, of which the centroid energy is ~ 6.8 keV. The overall spectrum can be reproduced by a thin-thermal plasma-emission model having a temperature of ~ 5.1 keV, on the condition that the heavy-element abundance is allowed to increase to 3.0_{-0.9}^{{+4.3}} solar abundance. The source was undetectable in a previous observation in 1993 October, as well as in a subsequent observation in 1996 April. The overall source behavior is thus quite peculiar, but may be explained in terms of a close binary involving a magnetized white dwarf viewed from pole-on inclination, where the unusually strong Fe-K line may be the result of resonant scattering of line photons.
Ishida Manabu
Kaneda Hidehiro
Kotani Taro
Makishima Kazuo.
Matsuzaki Keiichi
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