Results 11 to 20 of about 1,774 (127)
The Astrophysical Journal, 1978 A method is developed for estimating the nonradiative heating of stellar chromospheres by measuring the net radiative losses in strong Fraunhofer line cores. This method is applied to observations of the Mg II resonance lines in a sample of 32 stars including the sun.
J. L. Linsky, T. R. Ayres
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Stellar Model Chromospheres. H. Procyon (F5 Iv/v)
The Astrophysical Journal, 1974 Derivation of a model for the chromosphere and upper photosphere of Procyon (F5 IV-V) based on calibrated observations of the K and 8542-A lines of Ca II, the k(2796-A) line of Mg II, and the K-line wings. The feasibility of this model synthesis approach to derive a preliminary model chromosphere is demonstrated despite the lack of spatial and ...
Thomas R. Ayres +2 more
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Stellar chromospheres - H-alpha and CA II K profiles [PDF]
The Astrophysical Journal Supplement Series, 1983 D. M. Zarro, A. W. Rodgers
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Addendum - Detection of Mass Loss in Stellar Chromospheres
The Astrophysical Journal, 1980 R. E. Stencel, D. J. Mullan
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Heating of Stellar Chromospheres by Shock Waves.
The Astrophysical Journal, 1960 openaire +3 more sources
Extrasolar planets, stellar winds and chromospheric hotspots [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2006 Abstract Recent observations have shown what is believed to be planet-induced chromospheric activity on stars with hot Jupiters. We present a model of the magnetic interaction between a planet and a star with a dipolar magnetic field. Reconnection between the fields of the star and planet accelerates electrons along the field lines that ...
T. McIvor, M. Jardine, V. Holzwarth
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Journal of Geophysical Research: Space Physics, Volume 131, Issue 4, April 2026.Abstract Parker Solar Probe has been proven as instrumental for the observation of young solar wind. During the encounters E‐07 and E‐08, PSP recorded the core plus beaming protons crossing the heliospheric current Sheet region. When the observed PSP data is plotted in the temperature ratio versus parallel beta space, it is found that the occurrence ...
M. Rashid +10 more
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HST Observations of Chromospheres in Metal Deficient Field Giants
, 2007 HST high resolution spectra of metal-deficient field giants more than double the stars in previous studies, span about 3 magnitudes on the red giant branch, and sample an abundance range [Fe/H]= -1 to -3.
A. K. Dupree +19 more
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Searching for Rotational X‐Ray Modulation on TIC 277539431
Astronomische Nachrichten, Volume 347, Issue 3, March 2026.ABSTRACT TIC 277539431, a fast rotating M7 dwarf, was detected to host the highest latitude flare to date at 81°$$ {81}^{{}^{\circ}} $$. Magnetic activity like stellar flares occurring at high latitude indicate occurrence of coronal loops at these latitudes on fully‐convective M dwarfs. In contrast, sunspots usually occur below 30°$$ {30}^{{}^{\circ}} $
Desmond Dsouza +2 more
wiley +1 more source
Ultraviolet observations of stellar chromospheric activity
The Astrophysical Journal, 1982 A survey is presented of chromospheric and transition region (TR) line emission in late-type stars obtained with the IUE satellite. A wide variation in TR emission (ions formed near T = 100,000 K) at a given position in the H-R diagram is found, contradicting theories that incorporate only acoustic energy generation and deposition.
L. Hartmann, A. K. Dupree, J. C. Raymond
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