著者

Sanbuichi Kiyotaka Fukue Jun

出版者

Astronomical Society of Japan

雑誌

Publications of the Astronomical Society of Japan (ISSN:00046264)

巻号頁・発行日

vol.45, no.5, pp.p727-731, 1993-10

被引用文献数

2

---

Using the mass function obtained by D'Odorico et al. (1991, AAA 117.226), we recalculate the theoretical light curves of SS 433 in the primary eclipse and confront them with observations. We assume that in SS 433 there exists a geometrically thick torus around a compact object, and that the primary eclipse is an eclipse of the torus by a companion of an early-type star. The main parameters are the shape of the tori, the size of the tori, and the binary mass ratio. We obtain light curves for several combinations of parameters. The light curves for sufficiently thick tori are deep at the mid-eclipse and preferable, while those for geometrically thin tori are shallow. The duration of eclipse for a large torus is long and beneficial, while that for a small torus is short. Finally, m at mid-eclipse for a thick torus around a neutron star becomes ~ 0.6 and suitable, whereas for thick tori around a black hole it is ~ 0.3. Hence, under the new mass function, geometrically thick and wide tori around a neutron star can well reproduce the observed light curves of SS 433.

著者

Fukue Jun Matsumoto Katsura

出版者

Astronomical Society of Japan

雑誌

PASJ : publications of the Astronomical Society of Japan (ISSN:00046264)

巻号頁・発行日

vol.53, no.1, pp.111-117, 2001-02-25

---

In supersoft X-ray sources the mass accretion rate is roughly equal to the Eddington rate, and traditional standard###disks cannot be adequate. We thus propose a supercritical accretion disk (superdisk) for supersoft X-ray sources.We have found that superdisks exhibit various distinct features, compared with standard thin disks. The continuous spectra of superdisks generally become flat (vS_v ~ v^0), which are greatly different from those of disk-blackbody spectra, as expected in the usual accretion disk systems. This flat nature is not so prominent in supersoft X-ray sources, compared with that in the superdisk around a black hole, since the radial extension of the disk is much smaller. Moreover, irradiation becomes important for a smaller accretion rate system. The superdisk picture was applied to RX J0019.8+2156, and reproduced its spectra and optical light curves well.