Gamma Boo, a classical evolved Delta Scuti star

Details Gamma Boo, a classical evolved Delta Scuti star Gamma Boo, a classical evolved Delta Scuti star

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....76...15a&link_type=abstract

Astronomy and Astrophysics, vol. 76, no. 1, June 1979, p. 15-19.

Astronomy and Astrophysics

Astrophysics

8

Calcium, Cepheid Variables, Dwarf Stars, K Lines, Stellar Evolution, Stellar Spectra, Variable Stars, Astronomical Spectroscopy, Graphs (Charts), H Lines, Main Sequence Stars, Radial Velocity

Scientific paper

The star Gamma Bootis has been observed spectrographically at high dispersion. The discovery of repetitive bumps in the radial-velocity curves associated with splittings in calcium and hydrogen lines indicates that these phenomena are associated with the pulsation. This star is now definitely considered to be an evolved Delta Scuti variable despite its long period. The strong identity in the observational characteristics makes it possible to consider the evolved Delta Scuti stars as an intermediate group between the main-sequence variables and the Cepheid variables. The short time scale of the corresponding stage of evolution and the difficulties of detecting these variables explain the small number of such known objects.

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