Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259..595s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 2, p. 595-599.
Astronomy and Astrophysics
Astrophysics
29
Binary Stars, Starspots, Stellar Activity, Stellar Temperature, Ubv Spectra, Astronomical Photometry, High Resolution, Late Stars, Limb Darkening
Scientific paper
We have applied two different versions of the photometric spot-modeling technique to the spotted RS CVn-type binary HD 12545. New UBV(RI)c photometry from early 1991 showed the star with an exceptionally large amplitude of 0.50 mag in V and 0.12 mag in V - I and a rotation period of 24.30 +/- 0.02 d which suggests a spot coverage of approximately 20 percent of the entire stellar surface. Such large light and color amplitudes allowed us to separate effects of wavelength-dependent limb darkening from spot temperature with high confidence. This in turn makes it possible to obtain the, so far, most precise relative starspot temperature of 1100 +/- 35 K for a spotted, late-type star other than the sun. The U - B and B - V values and the minimum radius for HD 12545 suggest a K0III classification rather than the G5IV reported earlier. From a single, high-resolution spectrum of HD 12545 we found a strong LiI 6707 A line with an equivalent width of 100 +/- 15 mA (log n(Li) is approximately equal to 1.75), suggestive of a relatively young giant. In contrast, with our new spectral type classification, minimum stellar radius, and the observed mass function, we determine a space-velocity vector of 105 km/s, suggestive of an old disk star.
Oláh Katalin
Strassmeier Klaus G.
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