XTE J1739−302: An Unusual New X-Ray Transient
                    
                        
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XTE J1739-302: An Unusual New X-ray Transient
A new x-ray transient, designated XTE J1739–302, was discovered with the Proportional Counter Array (PCA) on the Rossi X-ray Timing Explorer (RXTE) in data from 12 August 1997. Although it was the brightest source in the Galactic Center region while active (about 3.0× 10ergs cms from 2 to 25 keV), it was only observed on that one day; it was not detectable nine days earlier or two days later. T...
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XTE J1739–302 is a transient X-ray source with unusually short outbursts, lasting on the order of hours. Here we give a summary of X-ray observations we have made of this object in outburst with the Rossi X-ray Timing Explorer (RXTE) and at a low level of activity with the Chandra X-ray Observatory, as well as observations made by other groups. Visible and infrared spectroscopy of the mass dono...
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We present optical and infrared observations of the soft X-ray transient (SXT) XTEJ2012+381 and identify the optical counterpart with a faint red star heavily blended with a brighter foreground star. The fainter star is coincident with the radio counterpart and appears to show weak Hα emission and to have faded between observations. The RXTE/ASM lightcurve of XTE J2012+381 is unusual for an SXT...
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We report X-ray imaging, timing, and spectral studies of XTE J1810−197, a 5.54 s pulsar discovered by Ibrahim et al. (2003) in recent RXTE observations. In a set of short exposures with the High Resolution Camera on-board the Chandra X-ray Observatory we detect a strongly modulated signal (55±4% pulsed fraction) with the expected period located at (J2000) 180951.08, −194351. 7, with a uncertain...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1998
ISSN: 0004-637X
DOI: 10.1086/311472