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J/AJ/128/846           VRI observations of CE Leonis               (Kang+, 2004)
The chromospherically active contact binary CE Leonis.
    Kang Y.W., Lee H.-W., Hong K.S., Kim C.-H., Guinan E.F.
   <Astron. J., 128, 846-857 (2004)>
   =2004AJ....128..846K
ADC_Keywords: Binaries, eclipsing ; Photometry, VRI

Keywords: binaries: eclipsing - stars: chromospheres -
          stars: individual (CE Leonis) - stars: spots

Abstract:
    We present complete VRI light curves of the contact binary CE Leo and
    provide detailed photometric solutions, as well as an analysis of its
    period variation. A total of 73 times of minima over 50years,
    including our observations, were used for the period study.

Description:
    The photometric observations of CE Leo were carried out as part of our
    near-contact and contact binary observing program at the Mount Bohyun
    Observatory (BOAO), Korea. The VRI observations were made in 1998
    February on two nights.
Objects:
    --------------------------------------------------------------
       RA   (2000)   DE      Designation(s)
    --------------------------------------------------------------
    11 44 24.2   +23 21 23   CE Leo = V* CE Leo
    11 44 07.4   +23 17 51   Comparison star = [SST93] CE Leo C
    11 44 01.8   +23 22 38   Check star = [SST93] CE Leo CH
    --------------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        20      327   VRI Observations of CE Leonis
table3.dat        54       73   Observed Times of Minimum of CE Leonis


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

   Bytes Format Units Label   Explanations

       1  A1    ---   Filter  [VRI] Filter
   3- 14  F12.4 d     HJD     Heliocentric Julian Date
  16- 20  F5.3  mag   Dmag    Observed magnitude difference in Filter


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

   Bytes Format Units Label    Explanations

   1- 12  F12.4 d     HJD-Min  Heliocentric Julian Date of minimum
  14- 21  F8.1  ---   Epoch    Orbital epoch (1)
  23- 31  F9.6  d     O-C1     The (O-C)1 residual
  33- 41  F9.6  d     O-C2     The (O-C)2 residual
  43- 44  A2    ---   Type     [I II] Type of maximum (1)
  46- 48  A3    ---   Method   Method used (2)
  50- 53  A4    ---   Ref      Reference (3)

Note (1): For the Meinunger & Wenzel (1968VeSon...7..385M) minima times, the
          eclipse types were reversed: primary timings were changed to
          secondary timings and vice versa.
Note (2): Method used as follows:
    P   = Photographic patrol plate observations;
    VI  = Visual estimates or observations;
    PE  = Photoelectric observations;
    CCD = Charge-coupled device observations.
Note (3): Reference as follows:
    BB1 = BBSAG Bull. 9;
    BB2 = BBSAG Bull. 14;
    BB3 = BBSAG Bull. 15;
    BB4 = BBSAG Bull. 21;
    BB5 = BBSAG Bull. 37;
    BB6 = BBSAG Bull. 92;
    BB7 = BBSAG Bull. 107;
    BB8 = BBSAG Bull. 112;
    BB9 = BBSAG Bull. 121;
    BB10 = BBSAG Bull. 125;
    BB11 = BBSAG Bull. 128;
    BR1 = Brno Contrib. 30;
    BR2 = Brno Contrib. 31;
    DI = Diethelm 2003IBVS.5438....1D;
    HO = Hoffmann 1983IBVS.2344....1H;
    KR = T. Krzyt, unpublished;
    MW = Meinunger & Wenzel 1968VeSon...7..385M;
    NE = Nelson 2001IBVS.5040....1N;
    SS = Samec & Su 1991IBVS.3650....1S;
    SZ = Safar & Zejda 2000IBVS.4888....1S;
    TH = This paper;
    YL = Yang & Liu 2002A&A...387..162Y.


History:
    From electronic version of the journal
(End)                   Greg Schwarz [AAS], Marianne Brouty [CDS]    08-Feb-2005