Results 141 to 150 of about 1,347 (178)
Distribution and Evolution of Starspots on the RS CVn Binary II Pegasi in 2004 [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 We present Doppler images of RS CVn-type binary II Peg based on two data sets obtained in 2004 February and November. In order to improve signal-to-noise ratio and reliability,we apply least-squares deconvolution technique to calculate average profiles ...
John Barnes +2 more
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The Connection Between Starspots and Superflares: A Case Study of Two Stars [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2023 How do the characteristics of starspots influence the triggering of stellar flares? Here we investigate the activity of two K-type stars, similar in every way from mass to rotation periods and planetary systems.
Alexandre Araujo
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On the temperature of starspots
2022Таврический астрофизический журнал, Выпуск 3 (2) 2022, Pages 27 ...
Alekseev, I.Yu., Gershberg, R.E.
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Properties of Starspots on CoRoT-2 [PDF]
Astronomy and Astrophysics, 2010 As a planet eclipses its parent star, a dark spot on the surface of the star may be occulted, causing a detectable variation in the light curve. A total of 77 consecutive transit light curves of CoRoT-2 were observed with a high temporal resolution of 32 s, corresponding to an uninterrupted period of 134 days. By analyzing small intensity variations in
Antonino F. Lanza, Roi Alonso, P Barge
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Starspot simulations for Kepler
Astronomische Nachrichten, 2012AbstractThe NASA Kepler mission yields an unprecedented amount of data in the form of photometric light curves. Apart from valuable information on exoplanets and stellar pulsations, the light curves contain rotation signals from starspots crossing the stellar disk. These modulations of the light curves are modeled and 105 simulations are carried out to
Nielsen, M.B.; id_orcid 0000-0002-9987-7712 +1 more
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Solar Physics, 1992
Recent observations of brightness variations on the sun during the solar cycle have motivated us to re-examine the widely held view that cool, dark starspots, covering a significant fraction of the star, are the centers of magnetic activity on BY Dra stars.
Bj�rn R. Pettersen +2 more
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Recent observations of brightness variations on the sun during the solar cycle have motivated us to re-examine the widely held view that cool, dark starspots, covering a significant fraction of the star, are the centers of magnetic activity on BY Dra stars.
Bj�rn R. Pettersen +2 more
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Modeling the Effects of Starspots on Stellar Magnetic Cycles [PDF]
Astronomy and AstrophysicsContext. Observations show that faster rotating stars tend to have stronger magnetic activity and shorter magnetic cycles. The cyclical magnetic activity of the Sun and stars is believed to be driven by the dynamo process.
Jie Jiang +2 more
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Astrophysics and Space Science, 1988
Formulae are set out from which the light loss may be derived in a close binary system in which a component affected by a ‘starspot’, of the type considered previously (Budding, 1977) is also in eclipse, in such a way that the starspot itself is undergoing eclipse.
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Formulae are set out from which the light loss may be derived in a close binary system in which a component affected by a ‘starspot’, of the type considered previously (Budding, 1977) is also in eclipse, in such a way that the starspot itself is undergoing eclipse.
openaire +1 more source
Astronomische Nachrichten, 2002
The discovery of exoplanets has resulted from a significant increase in the precision of stellar radial velocity measurements. In the past decade this precision has improved from several hundreds of ms–1 to a few ms–1. In the near future astrometric measurements will make a similar increase in their precision by factors of several hundred.
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The discovery of exoplanets has resulted from a significant increase in the precision of stellar radial velocity measurements. In the past decade this precision has improved from several hundreds of ms–1 to a few ms–1. In the near future astrometric measurements will make a similar increase in their precision by factors of several hundred.
openaire +1 more source