X-ray spectra and the rotation-activity connection of RS Canum Venaticorum binaries

Details X-ray spectra and the rotation-activity connection of RS Canum Venaticorum binaries X-ray spectra and the rotation-activity connection of RS Canum Venaticorum binaries

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...300..360m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 300, Jan. 1, 1986, p. 360-373.

Astronomy and Astrophysics

Astronomy

94

Spectrum Analysis, Stellar Rotation, Stellar Spectra, X Ray Binaries, X Ray Spectra, Heao 2, Histograms, Stellar Coronas, Stellar Temperature, Temperature Distribution, X Ray Astronomy

Scientific paper

Results are presented from a survey of RS CVn binaries which were observed with the imaging proportional counter (IPC) on board the Einstein Observatory. Spectral analyses of the IPC pulse height spectra show that the coronae of RS CVn binaries always contain hot gas with temperatures in excess of 10 to the 7th K, similar to active late-type main-sequence stars, and that at least two temperature components are necessary to account for the higher quality IPC spectra (when absorption is unimportant). It is argued that these bimodal temperature distributions found by the IPC are indicative of true distributions of emission measure versus temperature that are continuous (just as is the case of magnetically confined coronal plasma loops observed on the sun). It is further shown that none of the derivable X-ray characteristics of RS CVn binaries depend on rotation period, implying that previous claims of period-activity relationships in RS CVn binaries were unfounded.

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