Discovery and photometric observation of the optical counterpart of a possible galactic halo X-ray transient, XTE J1118+480

被引：52

作者：

Uemura, M ^{[1
]}

Kato, T

Matsumoto, K

Yamaoka, H

Takamizawa, K

Sano, Y

Haseda, K

Cook, LM

Buczynski, D

Masi, G

机构：

[1] Kyoto Univ, Fac Sci, Dept Astron, Sakyo Ku, Kyoto 6068502, Japan

[2] Kyushu Univ, Fac Sci, Dept Phys, Fukuoka 810, Japan

[3] VSOLJ, Nagano 3840502, Japan

[4] VSOLJ, Nayoro, Hokkaido, Japan

[5] VSOLJ, Toyohashi, Aichi 4418135, Japan

[6] Ctr Backyard Astrophys Calif, Concord, CA 94518 USA

[7] Conder Brow Observ, Lancaster LA2 0RQ, England

[8] Ctr Backyard Astrophys, I-03023 Ceccano, Italy

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2000年 / 52卷 / 04期

关键词：

accretion; accretion disks; stars : activity; stars : individual (XTE J11181-480);

D O I：

10.1093/pasj/52.4.L15

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We discovered an optical counterpart of about 13 mag of a soft X-ray transient, XTE J1118+480 on 2000 March 30. We performed astrometry and provided an accurate position of R.A. = 11(h)18(m)10.(s)85, Decl. = +48 degrees 02'12." 9. The outbursting object has been identified with a 18.8 mag star in the USNO catalog. Our pre-discovery data shows another outburst during 2000 January, again coinciding with an outburst detected in X-rays. Through CCD time-series photometry, we found the presence of a periodic variation with an amplitude of 0.055 mag and a period of 0.17078 +/- 0.00004 d, which we consider to be a promising candidate of the orbital period. Because of the high galactic latitude and faint quiescence magnitude of 18.8, XTE J1118+480 is possibly the first firmly identified black hole candidate X-ray transient in the galactic halo.

引用

页码：L15 / L20

页数：6

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