Semi-Regular Variables in the Solar Neighbourhood

Details Semi-Regular Variables in the Solar Neighbourhood Semi-Regular Variables in the Solar Neighbourhood

2007-04-24

arxiv.org/abs/0704.3150v1

Mon.Not.Roy.Astron.Soc.378:1543-1549,2007

Astronomy and Astrophysics

Astrophysics

MNRAS (accepted)

Scientific paper

10.1111/j.1365-2966.2007.11903.x

Period-luminosity sequences have been shown to exist among the Semi-Regular Variables (SRVs) in the Magellanic Clouds (Wood et al, 1999), the Bulge of the Milky Way galaxy (Glass & Schultheis, 2003) 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 sub-type are also discussed. K -- [12], a measure of circumstellar dust emission, increases clearly with V amplitude, M giant sub-type and log P.

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