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Titolo:
Spectra of binaries classified as lambda Bootis stars
Autore:
Faraggiana, R; Gerbaldi, M; Bonifacio, P; Francois, P;
Indirizzi:
Univ Trieste, Dipartimento Astron, I-34131 Trieste, Italy Univ Trieste Trieste Italy I-34131 imento Astron, I-34131 Trieste, Italy Inst Astrophys, F-75014 Paris, France Inst Astrophys Paris France F-75014 nst Astrophys, F-75014 Paris, France Univ Paris 11, Paris, France Univ Paris 11 Paris FranceUniv Paris 11, Paris, France Osserv Astron Trieste, Ist Nazl Astrofis, I-34131 Trieste, Italy Osserv Astron Trieste Trieste Italy I-34131 ofis, I-34131 Trieste, Italy European So Observ, Santiago 19, Chile European So Observ Santiago Chile19 opean So Observ, Santiago 19, Chile Observ Paris, DASGAL, F-92195 Meudon, France Observ Paris Meudon France F-92195 Paris, DASGAL, F-92195 Meudon, France
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 2, volume: 376, anno: 2001,
pagine: 586 - 598
SICI:
1432-0746(200109)376:2<586:SOBCAL>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
A-TYPE STARS; REFINED MK CLASSIFICATION; CIRCUMSTELLAR GAS; STROMGREN PHOTOMETRY; B-STARS; SHELL; ROTATION; CONFRONTATION; DUPLICITY; BEHAVIOR;
Keywords:
stars : abundances; stars : atmospheres; stars : chemically peculiar; stars : binaries : close; stars : binaries : spectroscopic; stars : binaries : visual;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
64
Recensione:
Indirizzi per estratti:
Indirizzo: Faraggiana, R Univ Trieste, Dipartimento Astron, Via GB Tiepolo 11, I-34131 Trieste, Italy Univ Trieste Via GB Tiepolo 11 Trieste Italy I-34131 Italy
Citazione:
R. Faraggiana et al., "Spectra of binaries classified as lambda Bootis stars", ASTRON ASTR, 376(2), 2001, pp. 586-598

Abstract

High angular resolution observations have shown that some stars classifiedas lambda Boo are binaries with low values of angular separation and magnitude difference of the components; therefore the observed spectrum of theseobjects is a combination of those two components. These composite spectra have been used to define spectroscopic criteria able to detect other binaries among stars classified as lambda Boo. The application of this method to HD 111786 is presented: the contribution of 5 components to the observed spectrum is demonstrated by the shape of the O I 7774 Angstrom feature. This result makes unreliable any attempt to perform an abundance analysis of this object which therefore must be definitely rejected from the class of the peculiar lambda Boo stars. This approach allowed us also to recognize that the SB2 star HD 153808 is in reality a triple system.

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Documento generato il 12/07/20 alle ore 09:41:54