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J/A+AS/140/55       Pulsation of galactic long-period variables (Barthes+, 1999)
Period-luminosity-colour distribution and classification of
galactic oxygen-rich LPVs. I. Luminosity calibrations.
       Barthes D., Luri X., Alvarez R., Mennessier M. O.
      <Astron. Astrophys. Suppl. Ser. 140, 55 (1999)>
      =1999A&AS..140...55B      (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable

Keywords: stars: variables: long-period variables - AGB -
          fundamental parameters - kinematics - evolution

Abstract:
    The absolute K magnitudes and kinematic parameters of about 350
    oxygen-rich Long-Period Variable stars are calibrated, by means of an
    up-to-date maximum-likelihood method, using Hipparcos parallaxes and
    proper motions together with radial velocities and, as additional
    data, periods and V-K colour indices. Four groups, differing by their
    kinematics and mean magnitudes, are found. For each of them, we also
    obtain the distributions of magnitude, period and de-reddened colour
    of the base population, as well as de-biased period-luminosity-colour
    relations and their two-dimensional projections. The SRa semiregulars
    do not seem to constitute a separate class of LPVs. The SRb appear to
    belong to two populations of different ages. In a PL diagram, they
    constitute two evolutionary sequences towards the Mira stage. The
    Miras of the disk appear to pulsate on a lower-order mode. The slopes
    of their de-biased PL and PC relations are found to be very different
    from the ones of the Oxygen Miras of the LMC. This suggests that a
    significant number of so-called Miras of the LMC are misclassified.
    This also suggests that the Miras of the LMC do not constitute a
    homogeneous group, but include a significant proportion of
    metal-deficient stars, suggesting a relatively smooth star formation
    history. As a consequence, one may not trivially transpose the LMC
    period-luminosity relation from one galaxy to the other.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
appenb.dat        56      357   List of the sample stars


See also:
     I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
    II/214 : Combined General Catalogue of Variable Stars (Kholopov+ 1998)


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

   Bytes Format Units   Label     Explanations

   1-  6  I6    ---     HIP       Hipparcos <Cat. I/239) code number
  11- 18  A8    ---     Name      GCVS (Cat. II/214) name
  23- 25  A3    ---     Type      Variability type
  30- 35  F6.1  d       Period    Pulsation period
  41- 50  A10   ---     Rem       Remarks: radial velocity or J mag unavailable


Acknowledgements: Dominique Barthes 

(End)                                         Patricia Bauer [CDS]   10-Sep-1999