Results 61 to 70 of about 1,347 (178)
Starspots and active regions on the chromospherically active binary MS Ser
, 2003 The quasisimultaneous electrophotometric, polarimetric and spectroscopic observations of the chromospherically active binary MS Ser are presented. The photometric variability of the star can be described completely by a zonal spottedness model.
I. Yu. Alekseev, O. V. Kozlova
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Effect of stellar spot-only spectral lines in high-resolution transit spectroscopy
Astronomy & AstrophysicsContext. High-resolution transit spectroscopy is a key technique for characterising exoplanet atmospheres. It relies on computing the absorption spectrum, which is sensitive to spectral discrepancies between the local spectra (absorbed by the planet) and
Dethier W. +5 more
doaj +1 more source
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
Benchmarking pre-main sequence stellar evolutionary tracks using disk-based dynamical stellar masses
Astronomy & AstrophysicsStellar masses are a fundamental property to understand models of pre-main sequence evolution, but their values derived from Hertzsprung–Russell (HR) diagrams are strongly model dependent.
Zallio Luigi +16 more
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Starspot photometry with robotic telescopes [PDF]
Astronomy and Astrophysics Supplement Series, 1997 We report on the progress of our ongoing photometric monitoring program of spotted late-type stars with automatic photoelectric telescopes (APTs) on Mt. Hopkins in Arizona and on Mt. Etna in Sicily. We present 9 250 differential UBV and/or observations for altogether 23 chromospherically active stars, singles and binaries, pre main sequence and post ...
K. G. Strassmeier +3 more
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Modeling starspots on low mass star GJ 1243 observed by TESS
, 2021 Quasi-periodic modulations of the stellar light curve may result from dark spots crossing the visible stellar disc. Since the release of the first TESS sector the possibility of examining such quasi-periodic modulations by assumed dark spots has ...
Falewicz, Robert +2 more
core +1 more source
Astronomy & AstrophysicsContext. Transmission spectroscopy has enabled the analysis of exoplanet atmospheres. However, a major challenge in this field is the “noise” from host stars, caused by stellar activity such as dark spots and bright plages.
Lucero Jennifer P. +4 more
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Molecules as magnetic probes of starspots [PDF]
Astronomy & Astrophysics, 2015 Stellar dynamo processes can be explored by measuring the magnetic field. This is usually obtained using the atomic and molecular Zeeman effect in spectral lines. While the atomic Zeeman effect can only access warmer regions, the use of molecular lines is of advantage for studying cool objects.
Afram, N., Berdyugina, S. V.
openaire +2 more sources
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 +5 more
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The circumstellar environment of the young, low-mass dipper star JH 223
Astronomy & AstrophysicsContext. Studies of magnetospheric accretion and magnetic field topology in T Tauri stars have advanced over the years, but their applications to fully convective, very-low-mass T Tauri stars remain relatively unexplored. Aims.
Freitas T. P. +13 more
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