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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
appenb.dat 56 357 List of the sample stars
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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
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Bytes Format Units Label Explanations
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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
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Acknowledgements: Dominique Barthes
(End) Patricia Bauer [CDS] 10-Sep-1999