CCD Echelle observations of the active RS CVn system II Pegasi

Details CCD Echelle observations of the active RS CVn system II Pegasi CCD Echelle observations of the active RS CVn system II Pegasi

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319..392h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 319, Aug. 1, 1987, p. 392-402.

Astronomy and Astrophysics

Astrophysics

48

Binary Stars, Charge Coupled Devices, Optical Emission Spectroscopy, Stellar Activity, Stellar Spectra, Visible Spectrum, Abundance, Balmer Series, Emission Spectra, Solar Flares, Spectrum Analysis

Scientific paper

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.

Affiliated with

Also associated with

No associations

Rating

CCD Echelle observations of the active RS CVn system II Pegasi does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with CCD Echelle observations of the active RS CVn system II Pegasi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and CCD Echelle observations of the active RS CVn system II Pegasi will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1340058