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[vsnet-campaign 247] XTE J1118+480 optical counterpart paper
From owner-vsnet@kusastro.kyoto-u.ac.jp Fri Jun 23 20:02 JST 2000
To: vsnet@kusastro.kyoto-u.ac.jp
cc: uemura@kusastro.kyoto-u.ac.jp
Date: Fri, 23 Jun 2000 19:57:04 +0900
From: Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>
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Subject: [vsnet 2025] Our paper on XTE J1118+480
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Dear colleagues,
Our paper on XTE J1118+480 (astro-ph/0004245) was accepted
for the publication in PASJ letter on June 20. We revised
the article available in astro-ph/0004245 to the accepted one
(http://arXiv.org/abs/astro-ph/0004245). This paper is written
on the basis of the data obtained by VSNET XTE J1118+480 collaboration
team. In the text we report the discovery of the optical counter part
of this newly discovered possible black hole X-ray nova in the galactic
halo and its periodic variability seen in the early phase.
The source is still bright and the periodic humps are also prominent.
We will welcome any collaboration about this object.
Regards,
Makoto Uemura
on behalf of VSNET XTE J1118+480 collaboration team
-----------
Title: Discovery and Photometric Observation of the Optical Counterpart in a
Possible Galactic Halo X-ray Transient, XTE J1118+480
Authors: M. Uemura, T. Kato, K. Matsumoto, H. Yamaoka, K. Takamizawa, Y. Sano,
K. Haseda, Lewis M. Cook, D. Buczynski, and G. Masi
Comments: 5 pages, 4 figures, accepted for the publication in PASJ letter
\\
We discovered the optical counterpart about 13 mag of a soft X-ray transient,
XTE J1118+480 on 2000 March 30. We perform astrometry and provide the accurate
position as R.A. = 11h18m10s.85, Decl. = +48o02'12".9. The outbursting object
is identified with a 18.8 mag star in USNO catalog. Our pre-discovery data
shows another outburst during 2000 January, again coinciding with an outburst
detected in X-rays. Through the CCD time-series photometry, we found the
presence of a periodic variation with the amplitude of 0.055 mag and the period
of 0.17078(0.00004)d which we consider as promising candidate of orbital
period. Because of the high galactic latitude and faint quiescence magnitude of
18.8, XTE J1118+480 is the possible first firmly identified black hole
candidate (BHC) X-ray transient in the galactic halo.
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