Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285l..23n&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 285, Oct. 1, 1984, p. L23-L26. Research supported b
Astronomy and Astrophysics
Astrophysics
56
Chromosphere, Dwarf Stars, Emission Spectra, Stellar Oscillations, Stellar Spectra, Calcium, Hydrogen, Potassium, Power Spectra, Radii, Solar Oscillations, Stellar Spectrophotometry, Vibration Mode
Scientific paper
Evidence of global p-mode oscillations in the K2 V star Epsilon Eridani, based on observed time variations in the Ca II H and K emission lines, is presented. Power spectra of time series of Ca II intensity measures reveal a number of peaks spaced at about 86 and 172 micro-Hz. The 172 micro-Hz spacing is significantly larger than the corresponding spacing observed for solar p-mode oscillations but is in excellent agreement with predictions for a star of the known radius of Epsilon Eri. The amplitude of the oscillations seen in the H and K flux of this chromospherically active star is much larger than in the sun. Peak power in the H and K fluctuations occurs at periods near 10 minutes, in contrast to predictions of peak oscillation amplitude near four minutes for a K2 dwarf.
Baliunas Sallie L.
Belserene Emilia
Duncan Douglas K.
Horne Jeff
Noyes Robert W.
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