Long-term variability of dMe stars

Abstract

view Abstract Citations (66) References (15) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Long-term variability of dMe stars. Phillips, M. J. ; Hartmann, L. Abstract 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. Publication: The Astrophysical Journal Pub Date: August 1978 DOI: 10.1086/156363 Bibcode: 1978ApJ...224..182P Keywords: Late Stars; Long Term Effects; M Stars; Stellar Spectrophotometry; Variable Stars; Data Reduction; Emission Spectra; Line Spectra; Photographic Plates; Starspots; Astrophysics; BY Draconis Stars:Variations full text sources ADS | data products SIMBAD (4)