Active regions on HR 1099 from a high resolution spectroscopic study of photospheric (Fe I) and chromospheric (Ca II and H-alpha) lines

Details Active regions on HR 1099 from a high resolution spectroscopic study of photospheric (Fe I) and chromospheric (Ca II and H-alpha) lines Active regions on HR 1099 from a high resolution spectroscopic study of photospheric (Fe I) and chromospheric (Ca II and H-alpha) lines

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...160...73g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 160, no. 1, May 1986, p. 73-94.

Astronomy and Astrophysics

Astrophysics

33

Abundance, Binary Stars, Chromosphere, H Alpha Line, Photosphere, Stellar Activity, Stellar Spectrophotometry, Calcium, Data Reduction, High Resolution, Iron, Late Stars, Spectral Resolution, Stellar Atmospheres, Stellar Magnetic Fields, Stellar Models

Scientific paper

The Doppler imaging technique applied to photospheric (Fe I) absorption lines and chromospheric (Ca II IR and Hα) emission lines of the HR 1099 (V711 Tau) RS CVn system shows that, on the primary star, photospheric spots 1000K cooler than the surrounding photosphere cover about 20% of the stellar disk and are overlapped with bright solar-like chromospheric plages. The location and extent of these active centers suggest the existence of important magnetic flux at relatively high latitudes (≡60°) of the K1 IV primary star. A speculative model in which material is driven from one active region to the other along magnetic field lines is suggested by the geometry of the system and can especially account for the Hα profile structure and the degree of polarization at radio frequencies observed in HR 1099.

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