Spectral-line variations in Sigma Geminorum

Details Spectral-line variations in Sigma Geminorum Spectral-line variations in Sigma Geminorum

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.221..947e&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 221, Aug. 15, 1986, p. 947-960.

Astronomy and Astrophysics

Astronomy

17

Binary Stars, Line Spectra, Stellar Spectra, Brightness Distribution, H Alpha Line, Metallicity, Photosphere, Starspots, Stellar Temperature

Scientific paper

Sigma Gem is a bright RS CVn binary with an orbital period of 19 day. Photometric observations by Fried et al. (1983) show that spots appear in two zones of longitude on opposite sides of the K1 giant primary. High-resolution (0.16 Å) echelle-Reticon spectra of σ Gem in the Hα order with high signal-to-noise ratio (≡130) show that the core of Hα varies with orbital phase in agreement with the spot zones and that the Hα brightness of a zone changes in time. Neutral metal lines in the same order have been studied to investigate the properties of the spots. A new method is described to determine spot areas and temperatures from temperature sensitive metal lines.

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