From: LARRY KLAES (ljk4_at_msn.com)
Date: Wed Jun 15 2005 - 20:57:36 PDT
----- Original Message -----
From: "Taichi Kato" <tkato_at_kusastro.kyoto-u.ac.jp>
To: <vsnet-chat_at_ooruri.kusastro.kyoto-u.ac.jp>
Sent: Wednesday, June 15, 2005 8:23 PM
Subject: [vsnet-chat 7097] X-ray Transient Source in M31
>
> What magnitude would be expected in outburst? Worth watching for the
> next outburst in the optical??
>
> Paper: astro-ph/0506312
> Date: Tue, 14 Jun 2005 15:58:33 GMT (185kb)
>
> Title: Optical Constraints on an X-ray Transient Source in M31
> Authors: Benjamin F. Williams, Michael R. Garcia, Frank A. Primini,
> Jeffrey E.
> McClintock, and Stephen S. Murray
> Comments: 15 pages, 3 figures, accepted for publication in ApJ
> \\
> We have detected a transient X-ray source in the M31 bulge through a
> continuing monitoring campaign with the Chandra ACIS-I camera. The source
> was
> detected at R.A.=00:42:33.428 +/- 0.11'', Dec.=+41:17:03.37 +/- 0.11'' in
> only
> a single observation taken 2004 May 23. Fortuitous optical HST/ACS imaging
> of
> the transient location prior to the X-ray outburst, along with follow-up
> HST/ACS imaging during and after the outburst, reveals no transient
> optical
> source brighter than B (equivalent) = 25.5. The location of the source and
> its
> X-ray properties suggest it is a low mass X-ray binary (LMXB). Assuming
> the
> transient is similar to many Galactic X-ray novae, the X-ray luminosity of
> (3.9
> +/- 0.5) X 10$^{37}$ erg s$^{-1}$ and the upper-limit on the optical
> luminosity
> provide a prediction of <1.6 days for the orbital period of the binary
> system.
> \\ ( http://arXiv.org/abs/astro-ph/0506312 , 185kb)
>
>
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