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Titolo:
Observations of Mira stars with the IOTA/FLUOR interferometer and comparison with Mira star models
Autore:
Hofmann, KH; Beckmann, U; Blocker, T; du Foresto, VC; Lacasse, M; Mennesson, B; Millan-Gabet, R; Morel, S; Perrin, G; Pras, B; Ruilier, C; Schertl, D; Scholler, M; Scholz, M; Shenavrin, V; Traub, W; Weigelt, G; Wittkowski, M; Yudin, B;
Indirizzi:
Max Planck Inst Radioastron, D-53121 Bonn, Germany Max Planck Inst Radioastron Bonn Germany D-53121 , D-53121 Bonn, Germany Observ Paris, F-92195 Meudon, France Observ Paris Meudon France F-92195Observ Paris, F-92195 Meudon, France Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA Harvard Smithsonian Ctr Astrophys Cambridge MA USA 02138 ge, MA 02138 USA Univ Heidelberg, Inst Theoret Astrophys, D-69121 Heidelberg, Germany Univ Heidelberg Heidelberg Germany D-69121 , D-69121 Heidelberg, Germany Univ Sydney, Sch Phys, Chatterton Dept Astron, Sydney, NSW 2006, AustraliaUniv Sydney Sydney NSW Australia 2006 Astron, Sydney, NSW 2006, Australia Sternberg Astron Inst, Moscow 119899, Russia Sternberg Astron Inst Moscow Russia 119899 n Inst, Moscow 119899, Russia ESO Garching, Munich, Germany ESO Garching Munich GermanyESO Garching, Munich, Germany
Titolo Testata:
NEW ASTRONOMY
fascicolo: 1, volume: 7, anno: 2002,
pagine: 9 - 20
SICI:
1384-1092(200201)7:1<9:OOMSWT>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPECKLE INTERFEROMETRY; IOTA INTERFEROMETER; GIANTS; RADII; SUPERGIANTS; EXTENSION; VARIABLES; SPECTRA;
Keywords:
instrumentation : interferometers; stars : AGB and post-AGB; stars : late-type; stars : variables; stars : individual : X Oph; stars : individual : R Aql; stars : individual : RU Her; stars : individual : R Ser; stars : individual : VCrB;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Hofmann, KH Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany Max Planck Inst Radioastron Hugel 69 Bonn Germany D-53121 any
Citazione:
K.H. Hofmann et al., "Observations of Mira stars with the IOTA/FLUOR interferometer and comparison with Mira star models", NEW ASTRON, 7(1), 2002, pp. 9-20

Abstract

We present K'-band observations of five Mira stars with the IOTA interferometer. The interferograms were obtained with the FLUOR fiber optics beam combiner, which provides high-accuracy visibility measurements in spite of time-variable atmospheric conditions. For the M-type Miras X Oph, R Aql, RU Her, R Ser, and the C-type Mira V CrB we derived the uniform-disk diameters 11.7 mas, 10.9 mas, 8.4 mas, 8.1 mas, and 7.9 mas (+/-0.3 mas), respectively. Simultaneous photometric observations yielded the bolometric fluxes. Thederived angular Rosseland radii and the bolometric fluxes allowed the determination of effective temperatures. For instance, the effective temperature of R Aql was determined to be 2970 +/- 110 K. A linear Rosseland radius for R Aql of 250(-60)(+100) R-. was derived from the angular Rosseland radius of 5.5 +/- 0.2 mas and the HIPPARCOS parallax of 4.73 +/- 1.19 mas. The observations were compared with theoretical Mira star models of Bessel et al. [A&A 307 (1996) 481] and Hofmann et al. [A&A 339 (1998) 846]. The effective temperatures of the M-type Miras and the linear radius of R Aql indicatefundamental mode pulsation. (C) 2002 Published by Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 15:00:45