Short time-scale variability of chromospheric CA II in late-type stars

Details Short time-scale variability of chromospheric CA II in late-type stars Short time-scale variability of chromospheric CA II in late-type stars

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..473b&link_type=abstract

Astrophysical Journal, Part 1, vol. 246, June 1, 1981, p. 473-483.

Computer Science

Sound

32

Calcium, Chromosphere, Emission Spectra, Late Stars, Stellar Spectra, Variable Stars, Dwarf Stars, Flare Stars, Giant Stars, H Lines, K Lines, Line Spectra, Sound Waves, Stellar Spectrophotometry

Scientific paper

The short time-scale variability of singly ionized calcium chromospheric emission has been investigated in a few late-type stars. Emission-line variations with time scales of a few minutes to hours are seen in Alpha Tau (K5 III), Lambda And (G8 III-IV), and Epsilon Eri (K2 V). The existence of substantial chromospheric flux changes (10 to the 30th to 10 to the 32nd ergs) over short periods of time suggests that the calcium emission arises from a few small, coherent regions. Frequencies present in the data are discussed in the context of acoustic wave predictions and estimated acoustic cutoff frequencies for giants and dwarfs.

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