Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...374..957s&link_type=abstract
Astronomy and Astrophysics, v.374, p.957-967 (2001)
Astronomy and Astrophysics
Astrophysics
10
Stars: Chemically Peculiar, Stars: Abundances
Scientific paper
This is the first of two papers whose main goal is to update and improve the information available on the physical properties of the lambda Bootis stars. The determination of the stellar parameters is of fundamental importance to shed light into the different theories proposed to explain the lambda Bootis phenomenon. With this aim, projected rotational velocities, effective temperatures, surface gravities and chemical abundances of a sample of suspected lambda Bootis stars have been calculated. Five objects showing composite spectra typical of binary systems were found in our analysis. The abundance distribution of the program stars does not resemble the chemical composition of the class prototype, lambda Boo, which poses some concerns regarding the idea of a well-defined, chemically homogeneous group of stars. A possible relation between rotational velocities and the lambda Bootis phenomenon has been found. This result would be in agreement with the accretion scenario proposed by Turcotte & Charbonneau (\cite{Turcotte93}). Figure 3 is only available in electronic form at http://www.edpsciences.org
Córdoba
Paunzen E. E.
Pintado Olga I.
Solano Enrique
Varela Jaime
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