Long-term variability of dMe stars

Details Long-term variability of dMe stars Long-term variability of dMe stars

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224..182p&link_type=abstract

Astrophysical Journal, Part 1, vol. 224, Aug. 15, 1978, p. 182-184. Research supported by the Langley-Abbott Fund;

Astronomy and Astrophysics

Astrophysics

49

Late Stars, Long Term Effects, M Stars, Stellar Spectrophotometry, Variable Stars, Data Reduction, Emission Spectra, Line Spectra, Photographic Plates, Starspots

Scientific paper

Photographic B magnitudes of the four spot stars BY Dra (dM0e), CC Eri (K7 Ve), AU Mic (dM2.5e), and YZ CMi (dM4.5e) are reported which considerably extend the time baseline of the photoelectric data on these stars. The long-term variation of the stars in yearly mean light is investigated. It is found that both BY Dra and CC Eri exhibit long-term B-magnitude variations with amplitudes of about 0.3 to 0.4 magnitude and times between maximum and minimum light near 30 yr. No apparent variability is observed for AU Mic and YZ CMi. The possibility is discussed that the variability of BY Dra and CC Eri is connected with a starspot cycle, for which the period would be around 60 yr.

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