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Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1170..449m&link_type=abstract
STELLAR PULSATION: CHALLENGES FOR THEORY AND OBSERVATION: Proceedings of the International Conference. AIP Conference Proceedin
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Pulsations, Oscillations, And Stellar Seismology, Cepheids, Stellar Characteristics And Properties
Scientific paper
The present work focuses on the discussion of the λ Bootis nature of the multiperiodic δ Scuti star HD 192640 (29 Cyg), through a comprehensive asteroseismic modelling. Some of the most recent asteroseismic tools are used to check whether the observed low metallicity is internal, i.e., intrinsic, present throughout the star, or due to superficial processes as accretion, diffusive settling, radiative levitation, mass loss, etc. The modelling method includes: 1) effects of rotation on equilibrium models, on the adiabatic oscillation spectrum, and its influence in multicolour observables, 2) non-adiabatic stability of radial and non-radial modes, 3) inclusion of the atmosphere-pulsation interaction for a more accurate multicolour mode identification. The analysis performed reveals that the models fulfilling all the constraints are those in the middle of the Main Sequence, with sub-solar metallicity, except for some other unlikely possibilities. Therefore this study does not support the idea of the λ Bootis stars being ZAMS or Pre-MS stars interacting with their primordial cloud of gas and dust, but suggests the explanation of their nature as sub-metallic MS objects. Nevertheless, more accurate multicolour photometric observations are required for a more conclusive study using the procedure presented here, since the observational errors are too large for a definitive rejection of any of the possible explanations.
Amado Pedro J.
Garrido Rafa
Martín-Ruíz Susana
Moya Andres
Rodríguez-López Cristina
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