Exploration of the Outer Envelope of the K-giant Star Beta Cet
The Astrophysical JournalInvestigating the atmospheres of giants and supergiants is critical to expanding our knowledge of stellar life cycles, galaxy formation, and the origin of material that forms exoplanets.
Krister E. Nielsen +2 more
doaj +1 more source
Chromospheric dust formation, stellar masers and mass loss [PDF]
A multistep scenario which describes a plausible mass loss mechanism associated with red giant and related stars is outlined. The process involves triggering a condensation instability in an extended chromosphere, leading to the formation of cool, dense ...
Stencel, R. E.
core +1 more source
Stellar Radio Astronomy. Probing Stellar Atmospheres from Protostars to Giants
, 2002 Radio astronomy has provided evidence for the presence of ionized atmospheres around almost all classes of non-degenerate stars. Magnetically confined coronae dominate in the cool half of the Hertzsprung-Russell diagram.
Guedel, Manuel
core +1 more source
Further Investigation on Chromospheric Activity Patterns of the RS Canum Venaticorum Star V711 Tauri
The Astronomical JournalWe present new long-term spectroscopic observations of the very active RS Canum Venaticorum (RS CVn) star V711 Tauri (V711 Tau), obtained during several observing runs from 2005 to 2021.
Dongtao Cao, Shenghong Gu
doaj +1 more source
UV chromospheric and circumstellar diagnostic features among F supergiant stars [PDF]
A survey of F supergiant stars to evaluate the extension of chromospheric and circumstellar characteristics commonly observed in the slightly cooler G, K, and M supergiant is discussed.
Giampapa, M. S. +2 more
core +1 more source
Role of Nonthermal Processes in the Quiescent and Active Millimeter Spectrum of a Young M Dwarf
The Astrophysical JournalMillimeter (mm) emission from F-M dwarfs (cool stars) primarily traces chromospheric activity, with thermal emission thought to dominate in quiescence. Despite the high chromospheric activity, the quiescent mm spectral fluence (mm- S ( ν )) of young (1 ...
Atul Mohan +5 more
doaj +1 more source
What Do We Know Through Spectral Information on Stellar Chromospheres and Coronas? [PDF]
, 1970 F. Praderie
openalex +1 more source
The Astrophysical Journal Supplement SeriesAbstract Accurately characterizing the intrinsic stellar photometric noise induced by stellar astrophysics, such as stellar activity, granulation, and oscillations, is of crucial importance for detecting transiting exoplanets. In this study, we investigate the relation between the intrinsic stellar photometric noise, quantified by the ...
Jinghua Zhang +11 more
openaire +3 more sources
The California Legacy Survey. V. Chromospheric Activity Cycles in Main-sequence Stars
The Astrophysical Journal Supplement SeriesWe present optical spectroscopy of 710 solar neighborhood stars collected over 20 years to catalog chromospheric activity and search for stellar activity cycles.
Howard Isaacson +33 more
doaj +1 more source
High resolution absolute flux profiles of the MC 2 h and k lines in evolved F8 to M5 stars [PDF]
The central results of a survey of the Mg II resonance line emission in a sample of over 50 evolved late type stars, including spectral-luminosity type F8 to M5 and La to IV are presented.
Basri, G. S. +3 more
core +1 more source