4.5 Article

Photospheric and chromospheric magnetic activity of seismic solar analogs Observational inputs on the solar-stellar connection from Kepler and Hermes

期刊

ASTRONOMY & ASTROPHYSICS
卷 596, 期 -, 页码 -

出版社

EDP SCIENCES S A
DOI: 10.1051/0004-6361/201628583

关键词

stars: solar-type; stars: activity; stars: evolution; methods: data analysis; methods: observational

资金

  1. European Community's Seventh Framework Program [312844, 269194]
  2. CNES GOLF grant
  3. PLATO grant
  4. ANR (Agence Nationale de la Recherche, France) program IDEE Interaction Des Etoiles et des Exoplanetes [ANR-12-BS05-0008]
  5. Newkirk Fellowship at the High Altitude Observatory
  6. NASA [NNX12AE17G, NNX15AF13G]
  7. CNPq PDE Harvard grant [PQ 308830/2012-1 CNPQ]

向作者/读者索取更多资源

We identify a set of 18 solar analogs among the seismic sample of solar-like stars observed by the Kepler satellite rotating between 10 and 40 days. This set is constructed using the asteroseismic stellar properties derived using either the global oscillation properties or the individual acoustic frequencies. We measure the magnetic activity properties of these stars using observations collected by the photometric Kepler satellite and by the ground-based, high-resolution Hermes spectrograph mounted on the Mercator telescope. The photospheric (S-ph) and chromospheric (S index) magnetic activity levels of these seismic solar analogs are estimated and compared in relation to the solar activity. We show that the activity of the Sun is comparable to the activity of the seismic solar analogs, within the maximum-to-minimum temporal variations of the 11-yr solar activity cycle 23. In agreement with previous studies, the youngest stars and fastest rotators in our sample are actually the most active. The activity of stars older than the Sun seems to not evolve much with age. Furthermore, the comparison of the photospheric, S (ph), with the well-established chromospheric, S index, indicates that the S (ph) index can be used to provide a suitable magnetic activity proxy which can be easily estimated for a large number of stars from space photometric observations.

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