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Kinematics and ages of Mira variables in the greater solar neighborhood
Wyatt, S. P.; Cahn, J. H.
AA(Illinois, University, Urbana, IL)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 275, Dec. 1, 1983, p. 225-239. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Milky Way Galaxy, Mira Variables, Radial Velocity, Stellar Evolution, Stellar Motions, Variable Stars, Interstellar Gas, Kinematics, Main Sequence Stars, Planetary Nebulae, Red Dwarf Stars, Stellar Mass
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The kinematical information at hand for 124 Mira variables in the greater solar neighborhood leads to a new assessment of the galactic velocity components of each star relative to local circular velocity, and period-spectrum data for the same stars lead to an estimate of their individual main sequence masses and ages. The U, V, and W velocity dispersions are larger for the oldest group of Miras. A comparison of these results with previous investigations of the motions of main sequence stars, in view of two major selection effects, yields good accord between the kinematical properties of the two groups. A study of the motions of planetary nebulae in the greater solar neighborhood leads to the conclusions that the star-spawning interstellar clouds have apparently undergone a slow and largely linear collapse toward the galactic plane, and that the rotary motions of the interstellar medium in the plane have slowly but steadily become less eccentric.

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