Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-05-31
Astronomy and Astrophysics
Astrophysics
Accepted for publication in A&A (May 2001). 13 pages
Scientific paper
10.1051/0004-6361:20010764
In this paper HIPPARCOS astrometric and kinematic data are used to calibrate both infrared luminosities and kinematical parameters of Long Period Variable stars (LPVs). Individual absolute K and IRAS 12 and 25 luminosities of 800 LPVs are determined and made available in electronic form. The estimated mean kinematics is analyzed in terms of galactic populations. LPVs are found to belong to galactic populations ranging from the thin disk to the extended disk. An age range and a lower limit of the initial mass is given for stars of each population. A difference of 1.3mag in K for the upper limit of the Asymptotic Giant Branch is found between the disk and old disk galactic populations, confirming its dependence on the mass in the main sequence. LPVs with a thin envelope are distinguished using the estimated mean IRAS luminosities. The level of attraction (in the classification sense) of each group for the usual classifying parameters of LPVs (variability and spectral types) is examined.
Alvarez Robert
Luri Xavier
Mennessier Marie-Odile
Mowlavi Nami
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