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Transits and starspots in the WASP-19 planetary system
Monthly Notices of the Royal Astronomical Society, 2013 We have developed a new model for analysing light curves of planetary transits when there are starspots on the stellar disc. Because the parameter space contains a profusion of local minima we developed a new optimization algorithm which combines the ...
John Southworth, Jeremy Tregloan-Reed
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Discovery of starspots on Vega
Astronomy and Astrophysics, 2015Context. The theoretically studied impact of rapid rotation on stellar evolution needs to be compared with these results of high-resolution spectroscopy-velocimetry observations. Early-type stars present a perfect laboratory for these studies. The prototype A0 star Vega has been extensively monitored in recent years in spectropolarimetry.
Matthias Holschneider, H Carfantan
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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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Starspots on eclipsing giant stars
Astronomy and AstrophysicsZsolt Kővári +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.
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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.
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Astronomische Nachrichten, 2002
I present a literature survey of the currently available Doppler images of cool stars. The 65 individual stars with Doppler images consist of 29 single stars and 36 components in close binaries. Out of the total, 31 were observed only once but 12 stars are (or were) being monitored for years. Each image for each star is identified with the time when it
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I present a literature survey of the currently available Doppler images of cool stars. The 65 individual stars with Doppler images consist of 29 single stars and 36 components in close binaries. Out of the total, 31 were observed only once but 12 stars are (or were) being monitored for years. Each image for each star is identified with the time when it
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The formation of sunspots and starspots
Astronomische Nachrichten, 2002The spatial scale of large solar active regions and many of their observed features indicate that they originate from the emergence of a coherent magnetic structure of rather well-ordered toroidal magnetic flux in the solar interior. Numerical simulations of the instability of magnetic flux tubes and their rise through the convection zone are ...
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SADE: The starspot and dynamo explorer
Advances in Space Research, 2003Abstract We propose a mission called SADE, the Starspot And Dynamo Explorer, to study dynamo activity in nearby late-type stars. The onboard instruments will be a Ca-K telescope for magnetically dominated chromospheric emission, and an X-ray grazing incidence telescope to study coronal emission.
Martens, P. +6 more
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