Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...281..395s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 281, no. 2, p. 395-420
Astronomy and Astrophysics
Astrophysics
72
Astronomical Maps, Binary Stars, Chromosphere, Photosphere, Rotational Spectra, Starspots, Stellar Activity, Stellar Models, Absorption Spectra, Astronomical Photometry, H Alpha Line, Line Spectra, Mathematical Models, Modulation, Stellar Spectra
Scientific paper
Observations of rotational modulation of photospheric absorption lines, chromospheric emission lines, and the continuum brightness of the RS CVn binary HD 106225 Pord = 10.4 days) are reported. From Doppler imaging of four photosperic lines we obtain the surface temperatures distribution at two observing epochs in 1991. Spot temperatures on HD 106225 were determined from three different proxy indicators (photometric broad-band colors, line-depth ratios, and line-profile shapes) and yield values between 1000-1500 K. Simultaneous Ca II H and K and H-alpha line-profile variations provide some clues on the spatial relation between the temperature distribution of the photosphere and the location of active regions in the chromosphere and we present, for the first time, a crude three-dimensional picture of a stellar atmosphere. Simultaneous and contemporaneous UBV photometry is used to trace the evolution of spotted regions in 1991. We applied a time-series spot modeling code and found a fairly stable spot configuration with two major spots. Only small and sporadic spot-area changes were present in 1991, which likely are unrelated to a long-term cycle.
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