On the long-term variability of the K2e star HD 224085

Details On the long-term variability of the K2e star HD 224085 On the long-term variability of the K2e star HD 224085

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229..183h&link_type=abstract

Astrophysical Journal, Part 1, vol. 229, Apr. 1, 1979, p. 183-186. Research supported by the Langley-Abbott Fund.

Astronomy and Astrophysics

Astrophysics

35

Binary Stars, Late Stars, Light Curve, Stellar Luminosity, Variable Stars, Emission Spectra, Long Term Effects, Photographic Plates, Starspots, Stellar Magnitude

Scientific paper

HD 224085 is a late-type, emission-line star with light variations that have been interpreted as due to starspots. The long-term variability of this object is studied using the Harvard archival plate collection. In contrast with previously studied BY Draconis variables, HD 224085 was essentially constant in mean light for about 40 years before beginning to exhibit changes not less than about 0.3 mag, both in the short-period variability and in mean light. The data suggest that stars with spots may pass through long periods of relative inactivity.

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