Access to Astronomical Catalogues

J/AcA/58/313        LMC Cepheids in OGLE and MACHO data      (Poleski+, 2008)
Period changes of LMC Cepheids in the OGLE and MACHO data.
    Poleski R.
   <Acta Astron., 58, 313-328 (2008)>
   =2008AcA....58..313P
ADC_Keywords: Magellanic Clouds ; Stars, variable

Keywords: stars: oscillations - Cepheids - Magellanic Clouds


Abstract:
    Pulsation period of Cepheids should change as stars evolve through the
    instability strip. Rates of these changes found by other authors based
    on the decades-long O−C diagrams show rather good agreement with
    theoretical predictions. We have checked the variability on the scale
    of a few years on the data recently published by the Optical
    Gravitational Lensing Experiment (OGLE) for the Large Magellanic Cloud
    Cepheids and found period changes for 18% of fundamental mode and 41%
    of first overtone pulsators. It suggest the overtone pulsations are
    less stable than the fundamental ones. For stars which had the
    cross-references in the MACHO catalog we have checked if the period
    change rates derived from the OGLE and the MACHO data are consistent.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
list.dat          49     2946   List of all analyzed Cepheids


See also:
    J/AcA/58/163 : VI light curves of LMC classical Cepheids (Soszynski+, 2008)
    ftp://ftp.astrouw.edu.pl/ogle/ogle3/OIII-CVS/lmc/cep/max_time : Home Page


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

   Bytes Format Units   Label     Explanations

   1- 13  A13   ---     ---       [OGLE-LMC-CEP-]
  14- 17  I04   ---     Star      Cepheid ID (OGLE LMC-CEP-NNNN)
  19- 28  F10.7 d       Per       Mean pulsation period
  30- 38  F9.7  d       e_Per     rms uncertainty on Per
  40- 41  A2    ---     Mode      [F 1O] Pulsation mode (Fundamental or 
                                         1st overtone)
  43- 49  A7    ---     Rem       Remarks (1)

Note (1): Remarks as follows:
      O = OGLE II data exist
      V = MACHO V data exist
      R = MACHO R data exist
      A = amplitude is variable in at least one of the data sets


History:
    Copied at ftp://ftp.astrouw.edu.pl/ogle/ogle3/OIII-CVS/lmc/cep/max_time
(End)                                      Patricia Vannier [CDS]    06-Apr-2010