Optical spectrophotometry of HR 1099 during a major flare outburst

Details Optical spectrophotometry of HR 1099 during a major flare outburst Optical spectrophotometry of HR 1099 during a major flare outburst

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978aj.....83.1527f&link_type=abstract

Astronomical Journal, vol. 83, Dec. 1978, p. 1527-1530.

Astronomy and Astrophysics

Astronomy

9

Balmer Series, Binary Stars, Radio Bursts, Radio Stars, Stellar Spectrophotometry, Visual Photometry, H Lines, K Lines

Scientific paper

A recent outburst of the active RS CVn star HR 1099 was detected at radio wavelengths and communicated in time for simultaneous optical observations. A pair of high-dispersion (9 and 18 A/mm) spectrograms was obtained, covering the wavelength region from 3640 to 7000 A and has been analyzed photometrically. Exceptionally strong emission was found at H-alpha and at the Ca II H and K lines. All of the members of the Balmer series exhibit emission characteristics with a decrement considerably less steep than that exhibited by normal recombination radiation from gaseous nebulae. Arguments are made that nonthermal excitation mechanisms are required to account for the data.

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