Semiregular variables in the solar neighbourhood |
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| Authors: | I S Glass F van Leeuwen |
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| Institution: | South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa;Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA |
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| Abstract: | Period–luminosity sequences have been shown to exist among the semiregular variables (SRVs) in the Magellanic Clouds, the bulge of the Milky Way galaxy and elsewhere. Using modern-period and revised Hipparcos parallax data, this paper demonstrates that they also appear among the M giant SRVs of the solar neighbourhood. Their distribution in the K , log P diagram resembles that of Bulge stars more closely than those in the Magellanic Clouds. The prevalence of mass-loss among local M-type SRVs and its dependence on period and spectral subtype are also discussed. K ?12] , a measure of circumstellar dust emission, increases clearly with V amplitude, M giant subtype and log P . |
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| Keywords: | stars: AGB and post-AGB stars: fundamental parameters stars: late-type stars: mass-loss stars: variables: other solar neighbourhood |
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