Results 51 to 60 of about 904 (176)

Starspot Imaging Using VRI Photometry [PDF]

Symposium - International Astronomical Union, 1986
Recent progress on maximum-entropy imaging of stellar surface brightness distributions using VRI photometry and Doppler-broadened absorption line profiles is reported. VRI photometry generally provides tighter constraints on starspot configurations than does Doppler imaging (which requires the use of large telescopes).
openaire   +1 more source

A Flexible Model for Investigating the Properties of Starspots: Model Characterization

, 2018
Starspots are sites of intense magnetic fields near a star’s optical surface that actively suppress convective flows causing the area to be dimmer and cooler than the surrounding ambient photosphere.
Ash, Amanda, Feiden, Gregory (5296351), Feiden, Gregory, Ash, Amanda (5943989), Hamilton.Jessica, Hamilton.Jessica (8224590)   +5 more
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Magnetic activity on the young Sun: A case study of EK Draconis

Astronomy & Astrophysics
Context. Young solar analog stars provide key insights into the early stages of stellar evolution, particularly in terms of magnetic activity and rotation.
Görgei A., Kriskovics L., Vida K., Seli B., Oláh K., Sági P., Bódi A., Järvinen S. P., Strassmeier K. G., Pál A., Kővári Zs.   +10 more
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Doppler imaging combined with high-cadence photometry

Astronomy & Astrophysics
Context. Latitude distribution of stellar magnetic activity is not well constrained by observations, despite its importance for a better understanding of stellar dynamos and their effects on planetary environments. Aims.
Lee S., Bahar E., Şenavcı H. V., Işık E., Ikuta K., Namekata K., Nagata H., Kawauchi K., Omiya M., Izumiura H., Tajitsu A., Sato B., Honda S., Nogami D.   +13 more
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Core-envelope Decoupling Drives Radial Shear Dynamos in Cool Stars

The Astrophysical Journal Letters, 2023
Differential rotation is thought to be responsible for the dynamo process in stars like our Sun, driving magnetic activity and starspots. We report that starspot measurements in the Praesepe open cluster are strongly enhanced only for stars that depart ...
Lyra Cao, Marc H. Pinsonneault, Jennifer L. van Saders   +2 more
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Starspots on late-type stars and their correlation with flare activity

, 2018
 Recent space-based observations (e.g., Kepler mission) found thousands of ``superflares’’ on G-, K-, and M-type stars. These superflare stars show quasi-periodic brightness variations caused by the rotation of the star with starspots.
Honda, Satoshi (5266576), Namekata, Kousuke, Nogami, Daisaku, Namekata, Kousuke (5981468), Honda, Satoshi, Ikuta, Kai (5981471), Maehara, Hiroyuki (5266573), Shibata, Kazunari, Notsu, Shota (5266570), Notsu, Shota, Ikuta, Kai, Notsu, Yuta (5266585), Notsu, Yuta, Shibata, Kazunari (5266579), Maehara, Hiroyuki, Nogami, Daisaku (5266582)   +15 more
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Forward modeling solar spectra onto Doppler images of λ And

Astronomy & Astrophysics
Context. Due to their high chromospheric activity and photometric variability, RS CVn-type binaries are ideal laboratories for studying stellar surface structures and the corresponding stellar activity relations.
Adebali Ö., Pietrow A. G. M.
doaj   +1 more source

Stellar Flares, Superflares, and Coronal Mass Ejections—Entering the Big Data Era

Universe
Flares, sometimes accompanied by coronal mass ejections (CMEs), are the result of sudden changes in the magnetic field of stars with high energy release through magnetic reconnection, which can be observed across a wide range of the electromagnetic ...
Krisztián Vida, Zsolt Kővári, Martin Leitzinger, Petra Odert, Katalin Oláh, Bálint Seli, Levente Kriskovics, Robert Greimel, Anna Mária Görgei   +8 more
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Subduction, Stratosphere, Starspots, and Sushi

Eos, 2017
Highlights from AGU’s joint meeting with the Japan Geophysical Union.
Jenny Lunn, Thorsten Becker, Delores Knipp, Andrew Yau, Minghua Zhang   +4 more
openaire   +1 more source

Starspots on the active young solar-type star AH Lep

, 2010
Young solar-type stars inform us about the early evolution of objects that form a major component of the stellar population of our galaxy. Single active young solar-type stars close to the Sun’s mass also provide us with proxies for the Sun’s early ...
Treschman, Keith
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