[vsnet-alert 7409] Re: IL Lup = 4U1543-47 bright outburst!

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

Re: IL Lup = 4U1543-47 bright outburst!

   According to Chen et al. (1997) ApJ 491, 312, IL Lup underwent three
historical X-ray outbursts (1971 August, 1983 August, 1992 April).

   The 1971 outburst reached 2.1 Crab, and the X-ray light curve
resembled those of "classical" X-ray novae (fast rise, slow exponential
decay).  The 1983 outburst reached 10 Crab.  Although the fading
part of this outburst was not well observed, the data suggest that
the X-ray light curve was of similar type.  However, the 1992 outburst
(1.04 Crab), the decay time-scale was only 1.6 d, indicating that
this outburst had different characters from the previous outbursts
(more resembling V4641 Sgr outbursts??)

   During the 1983 outburst, optical observation confirmed the
beightening to V=14.9.  The quiescent counterpart is reported
to have V=16.7.  The reported interstellar extioction (A_V=2.1 mag)
makes IL Lup a promosing target for CCD (red bands) observers.

Regards,
Taichi Kato

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp