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J/AJ/136/594        BS Cas BVR light curves                  (Yang+, 2008)
A photometric study of the neglected eclipsing binary BS Cassiopeiae.
    Yang Y.-G., Wei J.-Y., He J.-J.
   <Astron. J., 136, 594-601 (2008)>
   =2008AJ....136..594Y
ADC_Keywords: Binaries, eclipsing ; Photometry, CCD ; Photometry, UBVRI

Keywords: binaries: close - binaries: eclipsing -
          stars: individual (BS Cassiopeiae)

Abstract:
    We present multicolor charge-coupled device (CCD) photometry for the
    eclipsing binary BS Cassiopeiae, observed on four nights between 2007
    December and 2008 January. Using the Wilson-Devinney program, the
    photometric solution was derived from our BVR observations.
    Photometric results indicated that BS Cas is a W-subtype binary, whose
    mass ratio and overcontact degree are q=0.2834(±0.0010) and
    f=31.6%(±1.1%), respectively. Light curves of BS Cas present a
    typical O'Connell effect, which may be attributed to dark spot
    activity of the primary component.

Description:
    Photoelectric observations of BS Cas were made with the 85cm
    telescope at Xinglong Station of the National Astronomical
    Observatories of the Chinese Academy of Sciences (NAOC), equipped with
    a primary-focus multicolor CCD photometer.
Objects:
    ----------------------------------------------------------
       RA   (2000)   DE      Designation(s)
    ----------------------------------------------------------
    01 21 38.6   +59 10 27   BS Cas = 2MASS J01213857+5910268
    ----------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        56      455   CCD photometric observations in BVR-bands for
                              the eclipsing binary BS Cas
table4.dat        64       70   Available light minimum times


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

   Bytes Format Units   Label   Explanations

   1- 12  F12.4 d       HJD-B   ? Heliocentric Julian Date of B band observation
  14- 18  F5.3  mag     DBmag   ? Differential B band magnitude
  20- 31  F12.4 d       HJD-V   ? Heliocentric Julian Date of V band observation
  33- 37  F5.3  mag     DVmag   ? Differential V band magnitude
  39- 50  F12.4 d       HJD-R   Heliocentric Julian Date of R band observation
  52- 56  F5.3  mag     DRmag   Differential R band magnitude


Byte-by-byte Description of file: table4.dat

   Bytes Format Units  Label   Explanations

   1- 12  F12.4 d      HJD     Heliocentric Julian date
  14- 21  F8.1  ---    E       Cycle number
  23- 25  A3    ---    Met     Method used: ccd, pg (photographic) or vi (visual)
  27- 28  A2    ---    Min     [I II] Minimum (I or II)
  31- 37  F7.4  d      (O-C)1  (O-C) from Eq. (2) (1)
  39- 45  F7.4  d      (O-C)2  (O-C) from Eq. (3)  (1)
  47- 53  F7.4  d      (O-C)3  ? (O-C) from Eq. (5) (1)
  55- 61  F7.4  d      (O-C)4  ? (O-C) from Eq. (6) (1)
  63- 64  I2    --     Ref     Reference (2)

Note (1):
  * For O-C1 and O-C2: Min.I=HJD2427984.7395+0.44047629*E
    (O-C)1=-0.0270(±0.0007)+7.81(±0.01)x10-6E-1.48(±0.01)x10-10E2
    (O-C)2=-0.0005(±0.0002)
           +0.0023(±0.0014)*sin[5.72(±0.24)E+4.4736(±1.3565)]
  * For (O-C)3 and (O-C)4: 
    Min.I=HJD2454489.3850(±0.0042)+0.44046828(±0.00000008)*E.
    (O-C)3=60.2617(±0.0002)+9.81(±0.01)*10-6E-0.91(±0.01)*10-10E2
    (O-C)4=-0.0000(±0.0002)
           +0.0018(±0.0010)*sin[5.79(±0.26)E+3.7177(±1.4380)]
Note (2): References as follows:
      1 = Ahnert et al. (1947VeSon...1...43A)
      2 = Huebscher et al. (1992, BAV Mitt., 60)
      3 = Huebscher (2005IBVS.5643....1H)
      4 = Blaettler (1997, BBSAG Bull., 114, 5)
      5 = Diethelm (1998, BBSAG Bull., 117, 4)
      6 = Blaettler (2001, BBSAG Bull., 125, 3)
      7 = Dvorak (2003IBVS.5378....1D)
      8 = Krajci (2005IBVS.5592....1K)
      9 = Pribulla et al. (2005IBVS.5668....1P)
     10 = Huebscher et al. (2005IBVS.5657....1H)
     11 = Sobotka (2007IBVS.5809....1S)
     12 = Dvorak (2006IBVS.5677....1D)
     13 = Kim et al. (2006IBVS.5694....1K)
     14 = Huebscher & Walter (2007IBVS.5761....1H)
     15 = Huebscher et al. (2006IBVS.5731....1H)
     16 = Parimucha et al. (2007IBVS.5777....1P)
     17 = Dogru et al. (2007IBVS.5795....1D)
     18 = Brat et al. (2007, Open Eur. J. Variable Stars, 74, 1)
     19 = Present work


History:
    From electronic version of the journal
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    12-Feb-2011