J/A+A/403/993 Revised HIP periods for long-period variables (Knapp+, 2003)
Reprocessing the Hipparcos data of evolved stars.
III. Revised Hipparcos period-luminosity relationship for galactic
long-period variable stars.
Knapp G.R., Pourbaix D., Platais I., Jorissen A.
<Astron. Astrophys. 403, 993 (2003)>
=2003A&A...403..993K 2003A&A...403..993K
ADC_Keywords: Stars, late-type ; Stars, variable ; Parallaxes, trigonometric
Keywords: stars: carbon - stars: AGB and post-AGB - stars: oscillations
Abstract:
We analyse the K-band luminosities of a sample of galactic long-period
variables using parallaxes measured by the Hipparcos mission. The
parallaxes are in most cases re-computed from the Hipparcos
Intermediate Astrometric Data using improved astrometric fits and
chromaticity corrections. The K band magnitudes are taken from the
literature and from measurements by COBE, and are corrected for
interstellar and circumstellar extinction. The sample contains stars
of several spectral types: M, S and C, and of several variability
classes: Mira, semiregular SRa, and SRb.
We find that the distribution of stars in the period-luminosity plane
is independent of circumstellar chemistry, but that the different
variability types have different P-L distributions. Both the Mira
variables and the SRb variables have reasonably well-defined
period-luminosity relationships, but with very different slopes. The
SRa variables are distributed between the two classes, suggesting that
they are a mixture of Miras and SRb, rather than a separate class of
stars. New period-luminosity relationships are derived based on our
revised Hipparcos parallaxes. The Miras show a similar
period-luminosity relationship to that found for Large Magellanic
Cloud Miras by Feast et al. (1989MNRAS.241..375F 1989MNRAS.241..375F).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 64 268 Stars for which a new solution based on the
Hipparcos observations was derived
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP Hipparcos (Cat. I/239) Catalogue number
9- 19 A11 --- GCVS GCVS variable star name or Bayer name
21- 26 F6.2 mas plx Revised parallax
28- 31 F4.2 mas e_plx standard error on the revised parallax
33- 39 F7.2 --- Dplx Difference of parallax (plx - plxHIP)/e_plxHIP (1)
41- 45 F5.2 mag AK Circumstellar+interstellar absorption in K (2)
47- 51 F5.2 mag Kmag Apparent K (2.2µm) magnitude
53- 58 F6.2 d Per Period
60- 62 A3 --- Var Variability type from GCVS (Cat. II/214)
64 A1 --- Chem [COS] Carbon/oxygen chemistry of the atmosphere
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Note (1): diff=(plx-plxHIP)/e_plxHIP is the difference between the revised
parallax and the published one reckoned in units of the standard
error in the Hipparcos (Cat. I/239) parallax.
Note (2): AK is the total interstellar and circumstellar extinction
in the K band (see text of the paper).
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History:
01-Sep-2003: For HIP 28166 : BO Ori corrected into BQ Ori
Acknowledgements: Dimitri Pourbaix
References:
Pourbaix and Jorissen, Paper I 2000A&AS..145..161P 2000A&AS..145..161P
Knapp et al., Paper II 2001A&A...371..222K 2001A&A...371..222K
(End) Patricia Bauer [CDS] 01-Apr-2003