Results 111 to 120 of about 146,288 (166)

The stellar take on lithium

, 2013
This is a non-exhaustive review of what we have learned from 10+ years of cluster studies with multi-object spectrographs at 10 m-class telescopes about what stars do with their birth-cloud lithium.
A.J. Korn, Korn, Andreas,
core   +1 more source

Potential Chromospheric Evaporation in the M Dwarf’s Flare Triggered by Einstein Probe Mission

The Astronomical Journal
Although flares from late-type main-sequence stars have been frequently detected in the multiwavelength, the associated dynamical process has been rarely reported so far.
J. Wang, X. Mao, C. Gao, H. Y. Liu, H. L. Li, H. W. Pan, C. Wu, Y. Liu, G. W. Li, L. P. Xin, S. Jin, D. W. Xu, E. W. Liang, W. M. Yuan, J. Y. Wei   +14 more
doaj   +1 more source

Chromospheric turbulence as a regulator of stellar wind mass flux

Monthly Notices of the Royal Astronomical Society
ABSTRACT The mass flux of solar and stellar winds is a key quantity for stellar evolution and space weather, yet its physical regulation mechanism remains an unsolved problem. In particular, conventional Alfvén wave-driven models that self-consistently connect the stellar surface to the stellar wind fail to reproduce the observed ...
Munehito Shoda, Tom Van Doorsselaere, Allan Sacha Brun   +2 more
openaire   +2 more sources

The energy input mechanism into the lower transition regions between stellar chromospheres and coronae [PDF]

, 1988
The ratio of the emission line fluxes for the C II and C IV lines in the lower transition regions (T = 30,000 to 100,000 K) between stellar chromospheres and transition layers is shown to depend mainly on the temperature gradient in the line emitting ...
Boehm-Vitense, Erika
core  

The Impact of Dust/Gas Ratios on Chromospheric Activity in Red Giant and Supergiant Stars. [PDF]

Proc Int Astron Union, 2018
Carpenter KG, Rau G.
europepmc   +1 more source

HST-STIS Spectra of Antares (α Scorpii: M1.5 Iab)—Type II Supernova Progenitor and Betelgeuse’s Chromospheric Twin

The Astrophysical Journal
We present the first Hubble Space Telescope - Space Telescope Imaging Spectrograph (HST-STIS) far-ultraviolet (FUV) and near-ultraviolet (NUV) high-resolution spectra of the red supergiant (RSG) Antares (M1.5 Iab), isolated from its long-period B-star ...
Graham M. Harper, Thomas R. Ayres, Keiichi Ohnaka, Edward F. Guinan, Curtis DeWitt   +4 more
doaj   +1 more source

Stellar Library of Differential Emission Measures and Extreme Ultraviolet Spectra: Dwarf Stars Observed by the Extreme Ultraviolet Explorer

The Astrophysical Journal
Extreme ultraviolet (EUV; 100–912 Å) photons influence the formation and evolution of planets by ionizing hydrogen and other species, but the EUV radiation of most exoplanet host stars is poorly constrained.
Girish M. Duvvuri, Zachory K. Berta-Thompson, J. Sebastian Pineda, Kevin France, Alexander Brown, Allison Youngblood, David J. Wilson, Cynthia S. Froning, P. Christian Schneider, Thomas Ayres, Keivan G. Stassun   +10 more
doaj   +1 more source

Stellar activity and coronal heating: an overview of recent results. [PDF]

Philos Trans A Math Phys Eng Sci, 2015
Testa P, Saar SH, Drake JJ.
europepmc   +1 more source

HST Observations of HD 166620 and τ Ceti: First UV Spectra of a Magnetic Grand Minimum Star and the Extent of τ Ceti’s Astrosphere

The Astrophysical Journal
We present new Hubble Space Telescope (HST) UV spectra of the K2 V star HD 166620, the first star clearly recognized to be in a “magnetic grand minimum” state analogous to the Sun’s “Maunder minimum” in the late 1600s. The stellar H I Ly α surface fluxes
Brian E. Wood, Hans-Reinhard Müller, Dean Hartshorn, Seth Redfield, Travis S. Metcalfe   +4 more
doaj   +1 more source

Potential biosignatures in super-Earth atmospheres II. Photochemical responses. [PDF]

Astrobiology, 2013
Grenfell JL, Gebauer S, Godolt M, Palczynski K, Rauer H, Stock J, von Paris P, Lehmann R, Selsis F.   +8 more
europepmc   +1 more source