Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...297..710g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 297, Oct. 15, 1985, p. 710-718.
Astronomy and Astrophysics
Astrophysics
40
Cool Stars, Infrared Spectra, Line Spectra, Magnetic Measurement, Stellar Magnetic Fields, Stellar Spectrophotometry, Magnetic Flux, Spectrum Analysis
Scientific paper
High-resolution spectra obtained with the KPNO 4 m telescope and FTS in the infrared H and K bands are examined in order to select spectral lines suitable for measurements of stellar magnetic field strengths and filling factors. Only four lines are found suitable for the magnetic field measurement technique adopted in this study. The authors analyze the co-added spectra of the active stars ξ Boo A (G8 V), 61 UMa (G8 V) and λ And (G8 IV-III) as obtained during four consecutive nights. The analysis technique involves the Fourier deconvolution of magnetically sensitive and insensitive line profiles in a single spectrum. No evidence for the presence of magnetic fields is detected in the co-added spectra of either ξ Boo A or 61 UMa. The data for λ And suggest magnetic fields of ≡600 G extending over at least 20% of the visible hemisphere. However, these values are near the detection limit for the spectrum of λ And.
Bookbinder Jay A.
Giampapa Mark S.
Gondoin Ph.
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