Granulation in the Photosphere of ζ Cygni

Details Granulation in the Photosphere of ζ Cygni Granulation in the Photosphere of ζ Cygni

May 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aj....143..112g&link_type=abstract

The Astronomical Journal, Volume 143, Issue 5, article id. 112 (2012).

Astronomy and Astrophysics

Astronomy

Convection, Line: Profiles, Stars: Atmospheres, Stars: Late-Type, Sun: Granulation, Techniques: Spectroscopic

Scientific paper

A series of 35 high-resolution spectra are used to measure the third-signature plot of the G8 III star, ζ Cygni, which shows convective velocities only 8% larger than the Sun. Bisector mapping yields a flux deficit, a measure of granulation contrast, typical of other giants. The observations also give radial velocities with errors ~30 m s–1 and allow the orbit to be refined. Velocity excursions relative to the smooth orbital motion, possibly from the granulation, have values exceeding 200 m s–1. Temperature variations were looked for using line-depth ratios, but none were found.

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