Magnetic variability in the young solar analog KIC 10644253. Observations from the Kepler satellite and the HERMES spectrograph
| Autor: | Savita Mathur, Paul G. Beck, Rafael A. García, L. Bigot, Enrico Corsaro, O. L. Creevey, Travis S. Metcalfe, Jérôme Ballot, T. Ceillier, Ricky Egeland, J. D. do Nascimento, Clara Régulo, Pere L. Palle, F. Pérez Hernández, D. Salabert |
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| Přispěvatelé: | Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
oscillations [Stars]
FOS: Physical sciences Astrophysics solar-type [Stars] 01 natural sciences Kepler law.invention Telescope law 0103 physical sciences stars: activity observational [Methods] data analysis [Methods] 010303 astronomy & astrophysics Spectrograph Stellar evolution Solar and Stellar Astrophysics (astro-ph.SR) ComputingMilieux_MISCELLANEOUS Physics Solar analog [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] 010308 nuclear & particles physics Astronomy and Astrophysics stars: solar-type methods: data analysis Stars Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science [SDU]Sciences of the Universe [physics] Satellite Baryon acoustic oscillations stars: oscillations methods: observational activity [Stars] |
| Zdroj: | NASA Astrophysics Data System Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, 2016, 589, ⟨10.1051/0004-6361/201527978⟩ Repositório Institucional da UFRN Universidade Federal do Rio Grande do Norte (UFRN) instacron:UFRN |
| ISSN: | 1064-4253 0004-6361 |
| DOI: | 10.1051/0004-6361/201527978⟩ |
| Popis: | The continuous photometric observations collected by the Kepler satellite over 4 years provide a whelm of data with an unequalled quantity and quality for the study of stellar evolution of more than 200000 stars. Moreover, the length of the dataset provide a unique source of information to detect magnetic activity and associated temporal variability in the acoustic oscillations. In this regards, the Kepler mission was awaited with great expectation. The search for the signature of magnetic activity variability in solar-like pulsations still remained unfruitful more than 2 years after the end of the nominal mission. Here, however, we report the discovery of temporal variability in the low-degree acoustic frequencies of the young (1 Gyr-old) solar analog KIC 10644253 with a modulation of about 1.5 years with significant temporal variations along the duration of the Kepler observations. The variations are in agreement with the derived photometric activity. The frequency shifts extracted for KIC 10644253 are shown to result from the same physical mechanisms involved in the inner sub-surface layers as in the Sun. In parallel, a detailed spectroscopic analysis of KIC 10644253 is performed based on complementary ground-based, high-resolution observations collected by the HERMES instrument mounted on the MERCATOR telescope. Its lithium abundance and chromospheric activity S-index confirm that KIC 10644253 is a young and more active star than the Sun. Comment: Accepted for publication in A&A, 12 pages, 8 figures |
| Databáze: | OpenAIRE |
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