The Mean Blue Light Curve of Cygnus X-1

Binary corrected X-ray light curve of Cygnus X-3: Implications for the timing properties of the compact binary system

We study the binary corrected X-ray light curve of Cygnus X-3 using the RXTE-ASM (All Sky Monitor) data and RXTE-PCA data. We find that the X-ray template derived from the EXOSAT observations adequately explains the binary variations. Using the recently determined quadratic binary ephemeris we correct the RXTE-PCA lightcurve and obtain the power spectrum which shows distinct features of shiftin...

The Orbital Light Curve of Aquila X-1

We obtained Rand I-band CCD photometry of the soft X-ray transient/neutron-star binary Aql X-1 in 1998 June while it was at quiescence. We Ðnd that its light curve is dominated by ellipsoidal variations, although the ellipsoidal variations are severely distorted and have unequal maxima. After we correct for the contaminating Ñux from a Ðeld star located only away, the peak-to-peak amplitude 0A....

The X-ray Corona and Jet of Cygnus X-1

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عصر روشنگری زمان شکل گیری ایده های مدرن تربیتی- آموزشی بود اما تاکید بیش از اندازه ی دوشاخه مهم فلسفی زمان یعنی عقل گرایی و حس گرایی بر دقت و وضوح، انسان عصر روشنگری را نسبت به دیگر تواناییهایش نابینا کرده و موجب به وجود آمدن افرادی تک بعدی شد که افتخارعقلانیتشان، تاکید شان بر تجربه فردی، به مبارزه طلبیدن منطق نیاکانشان وافسون زدایی شان از دنیا وتمام آنچه با حواس پنجگانه قابل درک نبوده و یا در ...

Temporal evolution of X - ray lags in Cygnus X - 1

We present the long term evolution of the frequency dependent X-ray time lags of the black hole candidate Cygnus X-1 as measured in 1996 and 1998 with the Rossi X-ray Timing Explorer (RXTE). Lag spectra measured during the 1996 June soft state are very similar to those seen during 1996 December and most of 1998 while Cyg X-1 was in its hard state. During state transitions, however, the shape an...