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| The heterogeneous class of lambda Bootis stars We demonstrate that it is arduous to define the lambda Boo stars as aclass of objects exhibiting uniform abundance peculiarities which wouldbe generated by a mechanism altering the structure of their atmosphericlayers. We collected the stars classified as lambda Boo up to now anddiscuss their properties, in particular the important percentage ofconfirmed binaries producing composite spectra (including our adaptiveoptics observations) and of misclassified objects. The unexplained RVvariables (and thus suspected binaries), the known SB for which we lackinformation on the companion, the stars with an UV flux inconsistentwith their classification, and the fast rotating stars for which noaccurate abundance analysis can be performed, are also reviewed.Partly based on observations collected at the CFH Telescope (Hawaii) andat TBL of the Pic du Midi Observatory (France).Table \ref{tab5} is only available in electronic form athttp://www.edpsciences.org
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Osservazione e dati astrometrici
Costellazione: | Giraffa |
Ascensione retta: | 04h18m11.02s |
Declinazione: | +61°54'45.2" |
Magnitudine apparente: | 7.666 |
Distanza: | 243.309 parsec |
Moto proprio RA: | 0.1 |
Moto proprio Dec: | -0.5 |
B-T magnitude: | 7.671 |
V-T magnitude: | 7.667 |
Cataloghi e designazioni:
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