Results 121 to 130 of about 302 (161)

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

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

Radiative transfer in stellar chromospheres

, 1997
SIGLEAvailable from British Library Document Supply Centre-DSC:D194175 / BLDSC - British Library Document Supply CentreGBUnited ...
McMurry, A.D.
core  

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

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

Temperature distribution in a stellar atmosphere diagnostic basis

, 1973
A stellar chromosphere is considered a region where the temperature increases outward and where the temperature structure of the gas controls the shape of the spectral lines.
Jefferies, J. T., Morrison, N. D.
core  

Mind the Gap. II. The Near-UV Fluxes of M Dwarfs

The Astronomical Journal
Because of the continuous variations in mass, metallicity, and opacity, dwarf stars are distributed along the main sequence on optical and near-IR color–magnitude diagrams following a smooth polynomial.
Wei-Chun Jao, Allison Youngblood
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

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

Astrospheres and Solar-like Stellar Winds. [PDF]

Living Rev Sol Phys, 2004
Wood BE.
europepmc   +1 more source