Results 1 to 10 of about 7,684 (158)
Stellar Chromospheric Activity [PDF]
Living Reviews in Solar Physics, 2008 The Sun, stars similar to it, and many rather dissimilar to it, have chromospheres, regions classically viewed as lying above the brilliant photosphere and characterized by a positive temperature gradient and a marked departure from radiative equilibrium.
Hall Jeffrey C.
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The evolution of the solar–stellar activity [PDF]
Journal of Atmospheric and Solar-Terrestrial Physics, 2020 We present a brief review of observational results contributing to modern ideas on the evolution of stellar activity. Basic laws, derived for both rotation-age and activity-rotation relationships, allow us to trace how the activity of low-mass stars changes with age during their stay on the main sequence.
Cv Radhakrishnan
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THE STELLAR-ACTIVITY-ROTATION RELATIONSHIP AND THE EVOLUTION OF STELLAR DYNAMOS [PDF]
Astrophysical Journal, 2011 We present a sample of 824 solar and late-type stars with X-ray luminosities and rotation periods. This is used to study the relationship between rotation and stellar activity and derive a new estimate of the convective turnover time. From an unbiased subset of this sample the power law slope of the unsaturated regime, L_X / L_bol = Ro^β, is fit as β= -
Nicholas Wright +2 more
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Seismic Signatures of Stellar Magnetic Activity—What Can We Expect From TESS?
Frontiers in Astronomy and Space Sciences, 2019 Asteroseismic methods offer a means to investigate stellar activity and activity cycles as well as to identify those properties of stars which are crucial for the operation of stellar dynamos.
René Kiefer +3 more
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Stellar activity and coronal heating: an overview of recent results. [PDF]
Philos Trans A Math Phys Eng Sci, 2015 Testa P, Saar SH, Drake JJ.
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No Transits of Proxima Centauri Planets in High-Cadence TESS Data
Frontiers in Astronomy and Space Sciences, 2021 Proxima Centauri is our nearest stellar neighbor and one of the most well-studied stars in the sky. In 2016, a planetary companion was detected through radial velocity measurements.
Emily A. Gilbert +9 more
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Physical Properties of Radio Stars Based on LAMOST Spectral Survey
Universe, 2022 Radio emission has been detected for all types of stars in the Hertzsprung Russell diagram. Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) low and medium-resolution spectroscopic surveys provide a good opportunity to obtain the ...
Liyun Zhang +6 more
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Is Core Angular Momentum Key to the Giant Dynamo?
Universe, 2022 The pros and cons of core angular momentum dissipation into the convective envelopes of giants as a driver of giant activity is discussed in face of the observational evidence, which points to two ”magnetic strips“, in the HRD, where in the first, at the
Klaus-Peter Schröder +1 more
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Magnetic Activity of Different Types of Variable Stars Observed by TESS Mission
Universe, 2023 The investigation of the magnetic activity of different types of variable stars holds significant implications for our understanding of the physical processes and evolution of stars.
Ming Zhong +3 more
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Spots and Flares in Hot Main Sequence Stars Observed by Kepler, K2, and TESS
Frontiers in Astronomy and Space Sciences, 2021 About 22,000 Kepler stars, 7,000 K2 stars, and nearly 60,000 TESS stars from sectors 1–24 have been classified according to variability type. A large proportion of stars of all spectral types appear to have periods in their light curves consistent with ...
Luis A. Balona
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