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J/other/PZ/28.7     Cyg X-1 JK light curves                  (Taranova+, 2008)
The infrared variations of Cyg X-1 (V1357 Cyg), 1995-2007.
    Taranova O.G., Shenavrin V.I., Nadjip A.E.
   <Perem. Zvezdy, 28, 7 (2008)>
   =2008PZ.....28....7T
ADC_Keywords: Binaries, X-ray ; Photometry, infrared


Abstract:
    We present the results of our long-term (13 years) J and K photometry
    of the X-ray binary Cyg X-1. The object's JK variability amplitudes
    were less than 0.2mag. The J and K orbital light curves are appreciably
    asymmetric in quadratures. The secondary minimum is deeper, in
    comparison to the primary, and it is probable that the star becomes
    hotter at secondary minima.

Description:
    Our JK photometry of Cyg X-1 was performed at the 1.25-m telescope of
    the Crimean Laboratory of the Sternberg Astronomical Institute using a
    photometer with a liquid-nitrogen-cooled InSb detector. The photometer
    was mounted at the Cassegrain focus of the telescope; the exit
    aperture was ∼12". Observations were made between June, 1995 and
    September, 2007.
Objects:
    --------------------------------------------------
       RA   (2000)   DE      Designation(s)
    --------------------------------------------------
    19 58 21.68 +35 12 05.8  Cyg X-1 = V* V1357 Cyg
    --------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        35       99   The JK photometry of V1357 Cyg (Cyg X-1), 1995-2007


See also:
 J/PAZh/26/27  : Variability of Cyg X-1 (V1357) in 1995-1996 (Karitskaya+, 2000)
 J/AZh/78/408  : Variability of Cyg X-1 in 1994-1998 (Karitskaya+, 2001)
 J/A+A/447/245 : Cyg X-1 Spectral Evolution 1999-2004 (Wilms+, 2006)
 J/AZh/85/409  : V1357 Cyg spectroscopic monitoring, 2002-04 (Karitskaya+, 2008)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label     Explanations

   1- 11  F11.3 d       JD        Julian date
  13- 17  F5.3  mag     Jmag      ? J magnitude
  19- 23  F5.3  mag     e_Jmag    ? rms uncertainty on Jmag
  25- 29  F5.3  mag     Kmag      ? K magnitude
  31- 35  F5.3  mag     e_Kmag    ? rms uncertainty on Kmag


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    07-May-2012