Journal
ASTROPHYSICAL JOURNAL
Volume 767, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/767/1/34
Keywords
stars: activity; stars: individual (KIC 6603624, KIC 6933899, KIC 11244118); stars: oscillations; stars: solar-type
Categories
Funding
- NASAs Science Mission Directorate
- Carlsberg foundation
- FCT/MCTES, Portugal
- UK Science and Technology Facilities Council (STFC)
- FWO-Flanders [O6260 - G.0728.11]
- Danish National Research Foundation [DNRF106]
- ASTERISK project (ASTERoseismic Investigations with SONG and Kepler)
- European Research Council [267864]
- [PTDC/CTE-AST/098754/2008]
- Fundação para a Ciência e a Tecnologia [PTDC/CTE-AST/098754/2008] Funding Source: FCT
- Austrian Science Fund (FWF) [P 23608] Funding Source: researchfish
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Sun-like stars show intensity fluctuations on a number of timescales due to various physical phenomena on their surfaces. These phenomena can convincingly be studied in the frequency spectra of these stars-while the strongest signatures usually originate from spots, granulation, and p-mode oscillations, it has also been suggested that the frequency spectrum of the Sun contains a signature of faculae. We have analyzed three stars observed for 13 months in short cadence (58.84 s sampling) by the Kepler mission. The frequency spectra of all three stars, as for the Sun, contain signatures that we can attribute to granulation, faculae, and p-mode oscillations. The temporal variability of the signatures attributed to granulation, faculae, and p-mode oscillations was analyzed and the analysis indicates a periodic variability in the granulation and faculae signatures-comparable to what is seen in the Sun.
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