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- W2017384780 abstract "view Abstract Citations (63) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS CCD Echelle Observations of the Active RS CVn System II Pegasi Huenemoerder, David P. ; Ramsey, Lawrence W. Abstract Optical spectra were obtained of II Peg on eight different nights in 1984 and 1985 to assess the strength and variability of surface activity indicators in this very active RS CVn system. These cross-dispersed echelle spectra covered the range from 390 nm to 900 to 900 nm at a resolution of 12,000. EMission was seen in the first four Balmer lines, in the Ca II infrared triplet, Ca II H lines, and in one observation, in He I D3. The ratio of energy emitted in the H-alpha line to that in H-beta is similar to that in solar prominences, except during enhancements when the ratio decreases toward values more typical of solar flares. The H-alpha lines varied both in strength and in profile. There were slight variations in the Ca II infrared triplet lines. Exposure levels were too weak to assess the variations in H-gamma, H-delta, or Ca II H. Relative to comparison star spectra, the TiO bands at 896 nm and 710 nm were slightly deeper in II Peg, which is indicative of cool spots. Publication: The Astrophysical Journal Pub Date: August 1987 DOI: 10.1086/165463 Bibcode: 1987ApJ...319..392H Keywords: Binary Stars; Charge Coupled Devices; Optical Emission Spectroscopy; Stellar Activity; Stellar Spectra; Visible Spectrum; Abundance; Balmer Series; Emission Spectra; Solar Flares; Spectrum Analysis; Astrophysics; STARS: BINARIES; STARS: INDIVIDUAL CONSTELLATION NAME: II PEGASI full text sources ADS | data products SIMBAD (3)" @default.
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- W2017384780 date "1987-08-01" @default.
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- W2017384780 title "CCD Echelle observations of the active RS CVn system II Pegasi" @default.
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