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J/A+A/462/1081      BVRIJHK light curves of 4U 0115+63/V635 Cas    (Reig+, 2007)
The Be/X-ray transient 4U 0115+63/V635 Cassiopeiae.
III. Quasi-cyclic variability.
    Reig P., Larionov V., Negueruela I., Arkharov A.A., Kudryavtseva N.A.
   <Astron. Astrophys. 462, 1081 (2007)>
   =2007A&A...462.1081R
ADC_Keywords: Binaries, X-ray ; Photometry, UBVRIJKLMNH

Keywords: stars: pulsars: individual: 4U 0115+63, V635 Cas - X-rays: binaries -
          stars: neutron - stars: binaries close - stars: emission line, Be

Abstract:
    4U 0115+63 is one of the most active and best studied Be/X-ray
    transients. Previous studies of 4U 0115+63 have led to the suggestion
    that 4U 0115+63 undergoes relatively fast quasi-cyclic activity.
    However, due to the lack of good coverage of the observations, the
    variability time scales are uncertain.

    Our objective is to investigate the long-term behaviour of 4U
    0115+63/V635 Cas to confirm its quasi-cyclic nature and to explain its
    correlated optical/IR and X-ray variability.

    We have performed optical/IR photometric observations and optical
    spectroscopic observations of 4U 0115+63/V635 Cas over the last decade
    with unprecedented coverage. We have focused on the Hα line
    variability and the long-term changes of the photometric magnitudes
    and colours and investigated these changes in correlation with the
    X-ray activity of the source.
Objects:
    ----------------------------------------------------------
       RA   (2000)   DE      Designation(s)
    ----------------------------------------------------------
    01 18 31.9   +63 44 24   4U 0115+63 = V* V635 Cas
    ----------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat       111      357   Photometric observations
table3.dat        50       43   Log of the optical spectroscopic observations


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label     Explanations

   1-  9  F9.3  d       MJDB      ? Modified Julian Date for the B filter observation
  11- 15  F5.2  mag     Bmag      ? B magnitude (1)
  17- 25  F9.3  d       MJDV      ? Modified Julian Date for the V filter observation
  27- 31  F5.2  mag     Vmag      ? V magnitude (1)
  33- 41  F9.3  d       MJDR      Modified Julian Date for the R filter observation
  43- 47  F5.2  mag     Rmag      R magnitude (1)
  49- 57  F9.3  d       MJDI      ? Modified Julian Date for the I filter observation
  59- 63  F5.2  mag     Imag      ? I magnitude (1)
  65- 73  F9.3  d       MJDJ      ? Modified Julian Date for the J filter observation
  75- 79  F5.2  mag     Jmag      ? J magnitude (1)
  81- 89  F9.3  d       MJDH      ? Modified Julian Date for the H filter observation
  91- 95  F5.2  mag     Hmag      ? H magnitude (1)
  97-105  F9.3  d       MJDK      ? Modified Julian Date for the K filter observation
 107-111  F5.2  mag     Kmag      ? K magnitude (1)

Note (1): Uncertainties are ∼0.03 in B and ~<0.01 in the other bands.



Byte-by-byte Description of file: table3.dat

   Bytes Format Units      Label     Explanations

   1- 10  A10 "DD-MM-YYYY" Date      Date of observation
  12- 14  A3    ---        Tel       Telescope
  16- 19  I4    0.1nm      Range1    Wavelength range
      20  A1    ---        ---       [-]
  21- 25  I5    0.1nm      Range2    Wavelength range
  28- 36  F9.3  d          MJD       Modified Julian Date
  38- 42  F5.1  0.1nm      EWHa      Halpha equivalent width
  44- 46  F3.1  0.1nm      e_EWHa    rms uncertainty on EWHa
  48- 50  A3    ----       PHa       Profile of the Halpha line (1)

Note (1): Profile of the Halpha line code as follows:
     SP = single-peak
     DP = double-peak
    V>R = blue-dominated double-peak
    V<R = red-dominated double-peak
    V∼R = red and blue double-peaks equivalent
    ABS = absorption


Acknowledgements: Pablo Reig, pau(at)physics.uoc.gr


References:
   Negueruela & Okazaki, Paper I                2001A&A...369..108N
   Negueruela et al.   , Paper II               2001A&A...369..117N
(End)                                        Patricia Vannier [CDS]  10-Nov-2006