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- W2896687275 abstract "Abell 70 is a planetary nebula (PN) whose nucleus at optical wavelengths is a G8 star with enhanced carbon and s-process abundances--a barium The cool star is a binary companion of the true, hot central star. In several other members of this rare class, the cool star is known to rotate with a period of only a few days. This is attributed to a spin-up that occurred due to accretion from the wind of the central star during its post-AGB PN ejection; this also accounts for the unusual chemical composition of the companion's photosphere. We obtained photometry of the central star of Abell 70 on 104 nights in 2010-11, and find a periodic 2.061-day variation, but with a variable amplitude--indicating that the variability is due to starspots on a chromospherically active star. Abell 70 thus joins other members of this class in having a rapidly rotating and chemically peculiar late-type companion of the hot central star." @default.
- W2896687275 created "2018-10-26" @default.
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- W2896687275 date "2018-08-09" @default.
- W2896687275 modified "2023-09-27" @default.
- W2896687275 title "Periodic Variability of the Barium Central Star of the Planetary Nebula Abell 70" @default.
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- W2896687275 doi "https://doi.org/10.3847/2515-5172/aad7fd" @default.
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