期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 484, 期 4, 页码 4678-4682出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz324
关键词
stars: AGB and post-AGB; stars: mass-loss; stars: Population II; stars: variables: general; stars: winds, outflows; Magellanic Clouds
资金
- UK Science and Technology Facilities Council [ST/L00768/1]
- ERC Consolidator Grant funding scheme (project STARKEY) [615604]
- STFC [ST/P000649/1] Funding Source: UKRI
We link the onset of pulsation-enhanced, dust-driven winds from asymptotic giant branch (AGB) stars in the Magellanic Clouds to the star's transition between period-luminosity sequences (from B to C'). This transition occurs at similar to 60 d for solar-mass stars, which represent the bulk of the AGB population: this is the same period at which copious dust production starts in solar-neighbourhood AGB stars. It is contemporaneous with the onset of long secondary period (LSP) variability on sequence D. The combined amplitude of the first-overtone (B + C') and fundamental (C) modes and (perhaps) long-secondary period (D; LSP) variability appears to drive a sudden increase in mass-loss rate to a stable plateau, previously identified to be a few x 10(-7) M-circle dot yr(-1). We cite this as evidence that pulsations are necessary to initiate mass-loss from AGB stars and that these pulsations are significant in controlling stars' mass-loss rates. We also show evidence that LSPs may evolve from long to short periods as the star evolves, counter to the other period-luminosity sequences.
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