Spots and active longitudes on the star V815 Her

Details Spots and active longitudes on the star V815 Her Spots and active longitudes on the star V815 Her

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009arep...53..941s&link_type=abstract

Astronomy Reports, Volume 53, Issue 10, pp.941-949

Astronomy and Astrophysics

Astronomy

Surface Features, Stellar Activity, Stellar Atmospheres, Radiative Transfer, Opacity And Line Formation, Spectroscopic Binaries, Close Binaries

Scientific paper

An analysis of photometric observations for the starHD166181 (V815Her) is presented. B and V light curves were used to reconstruct temperature inhomogeneities on the stellar surface. The spots on the surface of V815 Her are concentrated at two preferred longitudes separated by 0.5 in phase (180° in longitude). The positions of more and less active regions quasi-periodically “flip-flop,” on time scales of about 600, 950, and 1250 days. The times of active-longitude switches coincide with the maxima and minima of the light curve and the amplitude of the brightness variations, as well as with the minima and maxima of the star’s spottedness.

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