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J/other/RMxAA/39.89      UBVRI and polarisation in Lynga 1     (Vazquez+, 2003)
Lynga 1, a small open cluster containing a red-supergiant member.
    Vazquez R.A., Giorgi E.E., Brusasco M.A., Baume G., Solivella G.R.
   <Rev. Mex. Astron. Astrofis., 39, 89-105 (2003)>
   =2003RMxAA..39...89V
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Polarization

Keywords: open clusters and associations: individual (Lynga 1) -
          stars: mass function, spectral classification - stars: polarization

Abstract:
    We present CCD UBVRI (Cousins system) photometric observations
    complemented with spectroscopy and polarimetric observations that
    were carried out in the open cluster Lynga 1. Our data indicate that
    the cluster reddening is EB-V=0.45±0.03, the ratio Av/EB-V=R
    suggests that the extinction law may be slightly anomalous (R∼3.5) and
    that the cluster distance modulus is V0-M_v=11.40±0.2. The age of
    Lynga 1 is between 100 and 125Myr according to a fitting of
    theoretical isochrones, and the slope of its mass spectrum is x∼1.7.
    The brightest red star in the field is a cluster member of spectral
    type K2 II-Ib.

Description:
    The observations were made on June 20, 1993, with the 60cm telescope
    of the University of Toronto Southern Observatory, Las Campanas,
    Chile.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat        73      257   CCD photometric observations in Lynga 1
table4.dat        33       77   Polarization measurements


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

   Bytes Format Units   Label   Explanations

   1-  3  I3    ---     VGB     Sequential number, Cl* Lynga 1 VGB NNN in Simbad
   6-  7  I2    ---     PF88    ? Peterson & Fitzgerald (1988MNRAS.235.1439P)
                                 number, Cl* Lynga 1 PF NN in Simbad
  10- 15  F6.2  pix     Xpos    X position (1)
  17- 22  F6.2  pix     Ypos    Y position (1)
  26- 30  F5.2  mag     Vmag    V magnitude
  31- 32  A2    ---     u_Vmag  [: ] Uncertainty flag on Vmag (2)
  33- 37  F5.2  mag     B-V     ? B-V colour index
  38- 40  A3    ---     u_B-V   [: ] Uncertainty flag on B-V (2)
  41- 45  F5.2  mag     U-B     ? U-B colour index
  46- 47  A2    ---     u_U-B   [: ] Uncertainty flag on U-B (2)
  50- 53  F4.2  mag     V-Rc    ? Cousins V-R colour index
  54- 55  A2    ---     u_V-Rc  [: ] Uncertainty flag on V-Rc (2)
  58- 61  F4.2  mag     V-Ic    ? Cousins V-I colour index
  62- 63  A2    ---     u_V-Ic  [: ] Uncertainty flag on V-Ic (2)
  66- 73  A8    ---     Notes   Notes about membership and color excess (3)

Note (1): North is up and East is left. 1 pix = 0.45".

Note (2): Double colon (::) for photometric errors >0.10.

Note (3): Notes:
       *: denotes stars used to derive the E(B-V) mean color excess;
      lm: denotes likely member stars;
      pm: denotes probable member;

   Stars with proper motions (in mas/y) available from Hippacos (I/239):
      Star 1: pmRAcosδ =  -4.5, pmDE =   2.8
      Star 2: pmRAcosδ =  -8.3, pmDE =   0.2
      Star 4: pmRAcosδ = -13.2, pmDE = -10.2
      Star 5: pmRAcosδ = -15.0, pmDE =   4.9
      Star 9: pmRAcosδ =  -5.8, pmDE =  -5.3

   Stars showing large differences with Peterson & Fitzgerald
   (1988MNRAS.235.1439P):
      Star  1: δV =  0.17; Vint = 12.56; δVint =  0.10
      Star 10: δV =  0.18; Vint = 12.32; δVint = -0.09
      Star 28: δV = -0.46; Vint = 13.68; δVint =  0.24
      Star 29: δV =  0.56; Vint = 13.97; δVint =  0.08
      Star 35: δV =  0.14; Vint = 14.71; δVint =  0.07
      Star 40: δV =  0.89; Vint = 14.45; δVint =  0.30
      Star 49: δV = -1.21; Vint = 15.39; δVint = -0.99


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

   Bytes Format Units   Label     Explanations

   1-  3  I3    ---     VGB       Sequential number, Cl* Lynga 1 VGB NNN in Simbad
       5  A1    ---     Band      [UBVRI] Photometric band
   7- 11  F5.2  %       Pol       Percentage of polarisation
  14- 17  F4.2  %       e_Pol     rms uncertainty on Pol
  19- 24  F6.2  deg     theta     Polarisation angle
  27- 31  F5.2  deg     e_theta   rms uncertainty on theta
      33  I1    ---     o_Band    Number of observations in the Band


History:
    Prepared via OCR at CDS.
(End)                       James Marcout, Patricia Vannier [CDS]    27-Feb-2004