Abstract
In 1998–1999, the X-ray transients XTE J2012+381 and XTE J1550-564 were observed with the TTM X-ray telescope onboard the Mir-Kvant astrophysical module. Spectral properties of these sources on the descent of the light curve after the secondary maxima of their outbursts are studied. Upper limits on the off-state flux are given. Comparison with other X-ray novae observed with the TTM telescope leads us to conclude that XTE J2012+381 and XTE J 1550-564 are soft X-ray novae. XTE J2012+381 probably belongs to the subclass of long-period X-ray transients.
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Translated from Pis'ma v Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Zhurnal, Vol. 28, No. 10, 2002, pp. 732–740.
Original Russian Text Copyright © 2002 by Aleksandrovich, Aref'ev.
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Aleksandrovich, N.L., Aref'ev, V.A. The soft X-ray novae, black-hole candidates XTE J2012+381 and XTE J 1550-564. Astron. Lett. 28, 660–668 (2002). https://doi.org/10.1134/1.1512223
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DOI: https://doi.org/10.1134/1.1512223