Access to Astronomical Catalogues

J/other/BASI/40.51  Cl* NGC 2539 CKY V3 and V4 BV light curves  (Kiron+, 2012)
A photometric study of contact binaries V3 and V4 in NGC 2539.
    Kiron Y.R., Sriram K., Vivekananda Rao P.
   <Bull. Astron. Soc. India, 40, 51-64 (2012)>
   =2012BASI...40...51K
ADC_Keywords: Clusters, open ; Stars, variable ; Photometry, UBV

Keywords: stars: binaries: eclipsing - stars: binaries: general -
          stars: distances - open clusters and associations: general

Abstract:
    CCD photometric observations of the eclipsing contact binaries (EW
    type) V3 and V4 of the cluster NGC 2539 were made in the B and V bands
    using the 2m telescope at the IUCAA-Girawali Observatory in India. The
    light curves have been obtained and using the Wilson-Devinney code,
    the combined photometric solutions have been presented here. The
    photometric solutions have revealed that both V3 and V4 are W-type
    contact binary systems with mass ratios of 0.806 and 1.001
    respectively. Revised orbital periods, absolute masses and radii of
    the components have been obtained.

Description:
    The observations of open cluster NGC 2539 were carried out at the
    IUCAA-Girawali Observatory (IGO) using the 2m telescope.

    The observations in B and V bands were carried out on four nights,
    during 2010 February 06-09.
Objects:
    ---------------------------------------------------
       RA   (2000)   DE      Designation(s)
    ---------------------------------------------------
    08 10 46.1  -12 53 14    V3 = Cl* NGC 2539 CKY V3
    08 10 38.4  -12 50 18    V4 = Cl* NGC 2539 CKY V4
    ---------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        27      110   B-band CCD observations of variables V3 and V4
                              of NGC 2539
table3.dat        27      102   V-band CCD observations of variables V3 and V4
                              of NGC 2539
table4.dat        68       12   CCD times of light minima for the observed
                              variables V3 and V4 of NGC 2539


Byte-by-byte Description of file: table[23].dat

   Bytes Format Units   Label     Explanations

   1- 13  F13.5 d       HJD       Heliocentric Julian Date
  15- 19  F5.3  mag     DV3       Differential magnitude for V3 variable (1)
  21- 25  F5.3  mag     DV4       Differential magnitude for V4 variable (2)
      27  A1    ---     Band      [BV] Observed band

Note (1): V3: Epoch=2455235.3972(23)(HJD), Per=0.2919997(35)d

Note (2): V4: Epoch=2455235.3692(42)(HJD), Per=0.3399994(36)d



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

   Bytes Format Units   Label     Explanations

   1-  2  A2    ---     Name      Variable name (V3 or V4)
   4- 14  F11.3 d       HJD       Heliocentric Julian date
  16- 17  A2    ---     Min       Type of Minima (I Primary II Secondary)
  19- 25  F7.1  --      E         Number of the cycle
  27- 34  F8.5  d       O-C       O-C residuals
  36- 68  A33   ---     Ref       References


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    09-Jul-2012