Spectrophotometric analysis of small sunspots

Details Spectrophotometric analysis of small sunspots Spectrophotometric analysis of small sunspots

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...191..149s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 191, no. 1, Feb. 1988, p. 149-153.

Astronomy and Astrophysics

Astrophysics

11

Penumbras, Stellar Spectrophotometry, Sunspots, Stellar Atmospheres, Zeeman Effect

Scientific paper

High resolution spectra of two small sunspots were obtained with the Gregory Vacuum Telescope at Izaña (Tenerife) on 1986 Oct. 8 and 9. The two lines Fe+ 6149 and Li7 6707 (doublet) were chosen for their very different behaviour in umbra atmospheres. Detailed shape analysis shows that cold spot models (Teff ≅ 4000K) cannot explain the present observations; a higher Teff ≅ 4600K has to be assumed. The influence of parasitic light produced by penumbral blurring and the contribution of dots is discussed.

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