Results 51 to 60 of about 250 (146)
The Astrophysical Journal, 1974 Sizes of starspots on flare stars can be derived from the author's convection-cell hypothesis. The sizes are in fair agreement with those observed on YY Gem, CC Eri, and BY Dra by Bopp and Evans (1973). The hypothesis predicts that periodic brightness variations due to starspots are restricted to stars brighter than a critical absolute visual ...
openaire +1 more source
KIC 6362386: An Eclipsing Binary with γ Doradus–type Pulsations and Starspots
The Astronomical JournalKIC 6362386 is an eclipsing binary system that exhibits both γ Doradus ( γ Dor)–type pulsations and starspots. In this study, we investigated this binary system using the Kepler photometry and the spectroscopic data from the Large Sky Area Multi-Object ...
Mengqi Jin +7 more
doaj +1 more source
The Astrophysical JournalStarspots are ubiquitous in young, low-mass stars, yet their impact on the spectral classification and fundamental parameter inference of pre-main-sequence stars (PMS) has been largely overlooked.
Facundo Pérez Paolino +4 more
doaj +1 more source
Characterisation of starspot structure and differential rotation of Kepler-411
Astronomy & AstrophysicsContext. Starspots and their movements on stellar surfaces enable the mechanisms of stellar magnetic activity to be investigated. Information on the spot distribution and differential rotation provide important constraints for the behaviour of stellar ...
Tuomi Mikko +2 more
doaj +1 more source
Acta Polytechnica CTU Proceedings, 2015 New spectroscopic and photometric observations of SS Cygni, the brightest dwarf nova system, have been obtained, with the aim of mapping starspots on the surface of the secondary star.
R. C. Smith +3 more
doaj +1 more source
Starspot Distribution and Flare Events in Two Young Low-mass Stars Using TESS Data
The Astrophysical JournalWide-field high-precision photometric observations such as the Transiting Exoplanet Survey Satellite (TESS) allowed the investigation of the stellar magnetic activity of cool stars. M dwarf starspots and stellar flares are the main indicators of magnetic
Rajib Kumbhakar +3 more
doaj +1 more source
Sunspots, Starspots, and Elemental Abundances
The Astrophysical Journal, 2017 Abstract Element abundances in the solar photosphere, chromosphere, transition region, and corona are key parameters for investigating sources of the solar wind and for estimating radiative losses in the quiet corona and in dynamical events such as solar flares.
G. A. Doschek, H. P. Warren
openaire +1 more source
Further Study of Starspot Activity and Measurement of Differential Rotation for SZ Piscium
The Astrophysical JournalWe present a series of nine Doppler images of the magnetically active K component of the RS CVn-type binary SZ Piscium (SZ Psc), based on high-resolution spectroscopic data collected from 2014 to 2018.
Yue Xiang +4 more
doaj +1 more source
Probing Starspot Dynamics on the Active M Dwarf TIC 272272592: A Multiyear TESS Study
The Astrophysical JournalWe present an analysis of temporal starspot evolution and its distribution on an active rapid rotator ( P _rot = 1.22 days), TIC 272272592, using high-precision time-series photometry from the Transiting Exoplanet Survey Satellite spanning over 3 yr. The
Rajib Kumbhakar +4 more
doaj +1 more source
Starspot Temperature of CoRoT-2 from Multiwavelength Observations with SPARC4
The Astrophysical JournalMeasuring starspot temperatures is crucial for understanding stellar magnetic activity as it affects stellar brightness variations, influences exoplanet transit measurements, and provides constraints on the physical conditions and energy transport in ...
Adriana Valio +7 more
doaj +1 more source