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Titolo:
VERY HIGH-PRECISION ORBIT OF CAPELLA BY LONG-BASE-LINE INTERFEROMETRY
Autore:
HUMMEL CA; ARMSTRONG JT; QUIRRENBACH A; BUSCHER DF; MOZURKEWICH D; ELIAS NM; WILSON RE;
Indirizzi:
UNIV SPACE RES ASSOC,300 D ST SW,SUITE 801 WASHINGTON DC 20024 USN OBSERV,NRL,OPT INTERFEROMETER PROJECT WASHINGTON DC 20390 UNIV FLORIDA,DEPT ASTRON GAINESVILLE FL 32611
Titolo Testata:
The Astronomical journal
fascicolo: 5, volume: 107, anno: 1994,
pagine: 1859 - 1867
SICI:
0004-6256(1994)107:5<1859:VHOOCB>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
MICHELSON INTERFEROMETRY; SPECTRAL TYPES; STARS; BINARY; STELLAR; PHOTOMETRY; ABUNDANCES; EVOLUTION; COMPONENT; COLORS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
49
Recensione:
Indirizzi per estratti:
Citazione:
C.A. Hummel et al., "VERY HIGH-PRECISION ORBIT OF CAPELLA BY LONG-BASE-LINE INTERFEROMETRY", The Astronomical journal, 107(5), 1994, pp. 1859-1867

Abstract

The orbital elements of the double-lined spectroscopic binary Capellahave been determined with unprecedented accuracy from observations with the Mark III optical interferometer. We have measured a magnitude difference, m(Aa)-m(Ab), of -0.05m +/- 0.05m, 0.15m +/- 0.05m, and 0.28m +/- 0.10m at lambdalambda800, 550, and 450 nm, respectively. We confirm previous observations that the more massive spectroscopic primary component Aa is also the cooler and visually fainter of the two stars. Measured stellar radii are R(Aa) = (12.2 +/- 0.2)R. and R(Ab) = (9.2 /- 0.4)R.. There is some evidence in our data for a departure of the brightness distribution of component Ab from a simple limb-darkened disk, possibly related to star spots. Using spectroscopy by Barlow et al. [PASP, 105, 476 (1993)], we derive component masses of M(Aa) = (2.69+/- 0.06) M. and M(Ab) = (2.56 +/- 0.04) M.. Comparison with recent stellar evolution models (Schaerer et al. 1993, A&AS, 98, 523) yields astellar age of 5.25 x 10(8) yr for a metallicity of Z = 0.008. In this scenario, component Aa has undergone helium ignition.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 04:31:26