Pulsation of the Lambda Bootis star HD 210111

M. Breger*, P. Beck, P. Lenz, L. Schmitzberger, E. Guggenberger, R. R. Shobbrook

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)

    Abstract

    Context. The λ Bootis stars are a small spectroscopic subgroup of Population I A-type stars and show significant underabundances of metals. Many are δ Scuti pulsators. Aims. HD 210111 was selected for a detailed multisite pulsation study to determine whether its pulsation properties differ from those of normal A stars. Methods. 262 h of high-precision photometry were obtained at the SAAO and SSO observatories. Results. 13 statistically significant pulsation frequencies were detected with very small photometric amplitudes from 1 to 7 millimag in the visual. A comparison with earlier 1994 measurements indicates a small increase in amplitude. As a byproduct, one of the comparison stars, HD 210571, was discovered to be a millimag variable with a frequency of 1.235 cd-1 and is probably a new γ Doradus variable. The observed wide range of excited frequencies from 12 to 30 cd -1 in HD 210111 can be explained with both the single- and double-star hypothesis. HD 210111 is in a similar evolutionary status to FG Vir, which also shows a wide range of excited frequencies with a similar frequency spacing near 4 cd-1. This is interpreted as successive radial orders of the excited nonradial modes. In the double-star hypothesis previously evoked for HD 210111, the low and the high frequencies originate in different stars: here HD 210111 would resemble Θ2 Tau. Conclusions. The pulsation of the λ Bootis star HD 210111 does not differ from that of normal δ Scuti stars.

    Original languageEnglish
    Pages (from-to)673-677
    Number of pages5
    JournalAstronomy and Astrophysics
    Volume455
    Issue number2
    DOIs
    Publication statusPublished - Aug 2006

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