Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...470l..53m&link_type=abstract
Astrophysical Journal Letters v.470, p.L53
Astronomy and Astrophysics
Astronomy
18
Stars: Novae, Cataclysmic Variables, Stars: White Dwarfs, X-Rays: Stars
Scientific paper
The new AM Her--type object AX J2315-592 was discovered with ASCA during the observation of IRAS 23128-5919. The light curve shows a clear periodic modulation at 1.489 +/- 0.013 hr. Follow-up phase-resolved optical spectroscopy confirmed coincidence of the rotational period of the white dwarf and the orbital period and identified AX J2315-592 as a new AM Her--type object. The shape of the X-ray light curve is quasi-sinusoidal, the amplitude of which decreases with increasing X-ray energy, which is the property of intermediate polars. The X-ray emission at the maximum of the folded light curve has an optically thin thermal plasma emission spectrum with a temperature of 17 +/- 4 keV with negligible absorption. The spectrum at the minimum, on the other hand, suffers from complex absorption. The X-ray light curve and the spectral characteristics indicate that a single accreting pole is always within the visible hemisphere of the white dwarf, and the rotational minimum occurs when the pole points toward the observer.
Ishida Manabu
Kamata Yuichi
Kunieda Hideyo
Misaki Kazutami
Tawara Yuzura
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