Results 21 to 30 of about 4,300 (180)
Joint Modeling of Radial Velocities and Photometry with a Gaussian Process Framework
The Astrophysical Journal, 2023 Developments in the stability of modern spectrographs have led to extremely precise instrumental radial velocity (RV) measurements. For most stars, the detection limit of planetary companions with these instruments is expected to be dominated by ...
Quang H. Tran +3 more
doaj +1 more source
Do Kepler superflare stars really include slowly-rotating Sun-like stars ? - Results using APO 3.5m telescope spectroscopic observations and Gaia-DR2 data - [PDF]
, 2019 We report the latest view of Kepler solar-type (G-type main-sequence) superflare stars, including recent updates with Apache Point Observatory (APO) 3.5m telescope spectroscopic observations and Gaia-DR2 data.
Davenport, James R. A. +9 more
core +3 more sources
Highlights of Astronomy, 1986 AbstractThe general methodology to detect and study solar-like surface inhomogeneities on stars is presented. The most significant observations and typical results are discussed with particular emphasis on the inferred physical characteristics of starspots and plages and differential rotation, as compared to solar values.
openaire +1 more source
Doppler Imaging of Starspots [PDF]
International Astronomical Union Colloquium, 1983 ABSTRACTWe discuss a newly-developed technique for spatially resolving starspots on some of the more rapidly rotating RS CVn stars. Basically, the method uses high resolution, very high signal-to-noise spectral line profiles and exploits the Doppler velocity correspondence between position across the stellar disk and wavelength position across a ...
Steven S. Vogt, G. Donald Penrod
openaire +1 more source
Contemporaneous Observations of Hα Luminosities and Photometric Amplitudes for M Dwarfs
The Astronomical Journal, 2023 While many M dwarfs are known to have strong magnetic fields and high levels of magnetic activity, we are still unsure about the properties of their starspots and the origin of their magnetic dynamos.
Aylin García Soto +4 more
doaj +1 more source
EvryFlare II: Rotation Periods of the Cool Flare Stars in TESS Across Half the Southern Sky [PDF]
, 2020 We measure rotation periods and sinusoidal amplitudes in Evryscope light curves for 122 two-minute K5-M4 TESS targets selected for strong flaring. The Evryscope array of telescopes has observed all bright nearby stars in the South, producing two-minute ...
Corbett, Hank +8 more
core +3 more sources
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
The STELLA Robotic Observatory on Tenerife
Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010 The Astrophysical Institute Potsdam (AIP) and the Instituto de Astrofísica de Canarias (IAC) inaugurated the robotic telescopes STELLA‐I and STELLA‐II (STELLar Activity) on Tenerife on May 18, 2006. The observatory is located on the Izaña ridge at an elevation of 2400 m near the German Vacuum Tower Telescope.
Klaus G. Strassmeier +12 more
wiley +1 more source
Stellar Magnetism and starspots: the implications for exoplanets [PDF]
, 2013 Stellar variability induce by starspots can hamper the detection of exoplanets and bias planet property estimations. These features can also be used to study star-planet interactions as well as inferring properties from the underlying stellar dynamo ...
del Burgo, Carlos +2 more
core +1 more source
Detecting the Companions and Ellipsoidal Variations of RS CVn Primaries: I. sigma Geminorum [PDF]
, 2015 To measure the properties of both components of the RS CVn binary sigma Geminorum (sigma Gem), we directly detect the faint companion, measure the orbit, obtain model-independent masses and evolutionary histories, detect ellipsoidal variations of the ...
Aarnio, Alicia N. +19 more
core +2 more sources