Spectroscopy of HR 4665 - A bright long-period RS CVn system

Details Spectroscopy of HR 4665 - A bright long-period RS CVn system Spectroscopy of HR 4665 - A bright long-period RS CVn system

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84.1763b&link_type=abstract

Astronomical Journal, vol. 84, Nov. 1979, p. 1763-1769.

Astronomy and Astrophysics

Astronomy

26

Astronomical Spectroscopy, Binary Stars, Hertzsprung-Russell Diagram, Radial Velocity, Velocity Measurement, Electrophotometry, H Lines, High Resolution, K Lines, Stellar Spectrophotometry

Scientific paper

Photographic spectroscopy of HR 4665 (sp. K0 III) shows it to be a double-line binary with strong Ca II H and K emission present in both components. The orbit is established from radial-velocity measurements, mostly made photoelectrically. High-resolution Reticon observations of the red region show no trace of H-alpha emission and establish a luminosity ratio near unity. HR 4665 seems to be a member of Hall's (1976) 'long-period group' of RS CVn-like variables, though the near equality of masses, spectral types, and surface activity levels in the two components makes it an atypical member of the class.

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