Reprocessing the Hipparcos data for evolved stars III Revised Hipparcos period-luminosity relationship for galactic long-period variable stars

By G. Knapp, Dimitri Pourbaix, I. Platais, A. Jorissen. 2003

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We analyze 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. (1989). The maximum absolute K magnitude of the sample is about -8.2 for both Miras and semi-regular stars, only a little fainter than the expected AGB limit. We show that the stars with the longest periods (P>400d) have high mass loss rates and are almost all Mira variables.

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Citations in the corpus

AGB variables and the Mira period–luminosity relation (2008, methodology): “Analysis of the original Hipparcos data was discussed by van Leeuwen et al. (1997), Whitelock & Feast (2000 - henceforth Paper I) and Knapp et al. (2003).”
Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles. II. CO line survey of evolved stars: derivation of mass-loss rate formulae (2010, unknown): “More recently, Barthès et al. (1999) and Knapp et al. (2003) derived P − K relations for oxygen-rich LPVs, including Miras and semi-regulars of types a and b.”
Validation of the new Hipparcos reduction (2007, methodology): “Data on the epoch-resolved colours of the red stars has been provided by Dimitri Pourbaix (see further: Platais et al. 2003; Knapp et al. 2001, 2003).”
An Empirical formula for the mass-loss rates of dust-enshrouded red supergiants and oxygen-rich asymptotic giant branch stars (2005, background): “For a few nearby examples these are consistent with determinations from Hipparcos data (Knapp et al. 2003).”