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Titolo:
MAXIMUM-ENTROPY MAPS OF THE BE SHELL STAR ZETA-TAURI FROM OPTICAL LONG-BASE-LINE INTERFEROMETRY
Autore:
QUIRRENBACH A; BUSCHER DF; MOZURKEWICH D; HUMMEL CA; ARMSTRONG JT;
Indirizzi:
MPI EXTRATERR PHYS,POSTFACH 1603 D-85748 GARCHING GERMANY USN OBSERV,NRL,OPT INTERFEROMETER PROJECT,AD5 WASHINGTON DC 20392 UNIV SPACE RES ASSOC WASHINGTON DC 20024 USN,RES LAB,DIV REMOTE SENSING WASHINGTON DC 20375
Titolo Testata:
Astronomy and astrophysics
fascicolo: 2, volume: 283, anno: 1994,
pagine: 13 - 16
SICI:
0004-6361(1994)283:2<13:MMOTBS>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
GAMMA-CASSIOPEIAE; ENVELOPE; LINE;
Keywords:
TECHNIQUES, INTERFEROMETRIC; STARS, EMISSION LINE, BE; STARS, IMAGING; STARS, INDIVIDUAL, SIGMA-TAU; STARS, MASS-LOSS;
Tipo documento:
Letter
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
34
Recensione:
Indirizzi per estratti:
Citazione:
A. Quirrenbach et al., "MAXIMUM-ENTROPY MAPS OF THE BE SHELL STAR ZETA-TAURI FROM OPTICAL LONG-BASE-LINE INTERFEROMETRY", Astronomy and astrophysics, 283(2), 1994, pp. 13-16

Abstract

We present the. first maximum-entropy maps reconstructed from visibility amplitudes obtained with an optical long-baseline interferometer. They show the Be shell star zeta Tauri. In the continuum at 550 nm thestar is an unresolved point source, whereas in the light of the Halpha line an extended, elongated structure is observed. The best-fit parameters of an elliptical Gaussian model are: major axis a = 3.55 +/- 0.33 mas, axial ratio r = 0.30 +/- 0.03, position angle phi = -59-degrees +/- 4-degrees. The morphology of the Halpha emission region is most easily interpreted as a disk seen almost edge-on; if this disk is axially symmetric, a limit for the inclination i less-than-or-equal-to 73-degrees can be derived. Our observations provide further evidence for the equatorial disk model of Be stars.

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Documento generato il 23/11/20 alle ore 19:53:32