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Parameters T eff and L/L for a Group of λ Bootis Candidate Stars and their Evolutionary Status

  • M. Gerbaldi (a1), J. Zorec (a1), F. Castelli (a2) and R. Faraggiana (a3)

Abstract

The T eff value, according to the definition of this parameter, is computed with the procedure described; the observations are then compared with the flux distribution from Kurucz’ LTE blanketed models for various values of the metallicity parameter [Z/H].

Then we derive the bolometric luminosity L/L by combining the stellar bolometric flux with the values of the trigonometric parallaxes and of the colour excess found in the literature. These luminosities are then plotted on evolutionary sequences; from the position of some λ Boo stars (ρ Vir and π1 Ori), we argue that their evolutionary stage, if interpreted as that of stars having left the main sequence, is too late to keep the λ Boo abundance anomalies.

These same λ Boo stars, plotted on pre-main sequence evolutionary tracks, would indicate increasing λ Boo character when the stars are approaching the main sequence showing the strongest character in λ Boo and 29 Cyg, the two stars nearest the ZAMS.

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References

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Parameters T eff and L/L for a Group of λ Bootis Candidate Stars and their Evolutionary Status

  • M. Gerbaldi (a1), J. Zorec (a1), F. Castelli (a2) and R. Faraggiana (a3)

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