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Astron. Astrophys. 350, 859-864 (1999)

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A comparative high-resolution spectroscopic study of the Hyades giants [FORMULA] Tauri and [FORMULA] Tauri

G. Smith

Department of Physics, Nuclear and Astrophysics Laboratory, Keble Road, Oxford, OX1 3RH, UK

Received 21 April 1999 / Accepted 30 August 1999


Spectra of the Hyades K0 giants [FORMULA] Tau and [FORMULA] Tau in the regions 5852-5864 Å and 6145-6176 Å have been recorded at high resolution and with signal/noise in the range 150-250. A critical comparison reveals that, although nearly all lines in the observed regions have a similar depth, lines of [FORMULA] Tau are broader by about 10% than those of [FORMULA] Tau. An LTE analysis indicates that slightly higher turbulent broadening in [FORMULA] Tau can account for the observed differences in line-width. Study of two particularly temperature sensitive features confirms earlier observations that the effective temperature of [FORMULA] Tau is less than that of [FORMULA] Tau and determines the temperature difference to be [FORMULA] K.

Key words: stars: abundances – stars: fundamental parameters – stars: individual: fl Tau – stars: individual: ffl Tau – stars: late-type

Send offprint requests to: G. Smith

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© European Southern Observatory (ESO) 1999

Online publication: October 14, 1999