Evidence for a starspot cycle on BD +26 deg 730

Details Evidence for a starspot cycle on BD +26 deg 730 Evidence for a starspot cycle on BD +26 deg 730

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249..662h&link_type=abstract

Astrophysical Journal, Part 1, vol. 249, Oct. 15, 1981, p. 662-665.

Astronomy and Astrophysics

Astrophysics

55

Binary Stars, Dwarf Stars, Stellar Spectrophotometry, Variable Stars, Cycles, Light Modulation, Periodic Variations, Stellar Rotation, Stellar Spectra

Scientific paper

It is demonstrated that the dK5e star BD +26 deg 730 exhibits a smooth variation in mean light, suggestive of a 60 year spot cycle. Photographic data from the Harvard archival plate collection indicate a total amplitude of at least 0.5 mag., the largest yet observed in a BY Dra star. Spectroscopic observations show that the star is a single-lined spectroscopic binary with a period of about 2 days and velocity amplitude of about 20 km/s. These data indicate that the primary star is viewed nearly pole-on from earth. It is suggested that this geometry reduces the rotational modulation of phototospheric light, so that the long-term starspot cycle is more clearly apparent in the photometric data.

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