First Keck interferometer measurements in self-phase referencing mode: spatially resolving circum-stellar line emission of 48 Lib

被引：0

作者：

Pott, J. -U. ^{[1
,2
,3
]}

Woillez, J. ^{[1
]}

Ragland, S. ^{[1
]}

Wizinowich, P. L. ^{[1
]}

Eisner, J. A. ^{[4
]}

Monnier, J. D. ^{[5
]}

Akeson, R. L. ^{[6
]}

Ghez, A. M. ^{[3
,7
]}

Graham, J. R. ^{[8
]}

Hillenbrand, L. A. ^{[9
]}

Millan-Gabet, R. ^{[6
]}

Appleby, E. ^{[1
]}

Berkey, B. ^{[1
]}

Colavita, M. M.

Cooper, A. ^{[1
]}

Felizardo, C. ^{[6
]}

Herstein, J. ^{[6
]}

Hrynevych, M. ^{[1
]}

Medeiros, D. ^{[1
]}

Morrison, D. ^{[1
]}

Panteleeva, T. ^{[1
]}

Smith, B. ^{[1
]}

Summers, K. ^{[1
]}

Tsubota, K. ^{[1
]}

Tyau, C. ^{[1
]}

Wetherell, E. ^{[1
]}

机构：

[1] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[2] Calif Assoc Res Astron, WM Keck Observ, Kamuela, HI 96743 USA

[3] Univ Calif Los Angeles, Div Astron & Astrophys, Los Angeles, CA 90095 USA

[4] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[5] NASA, Exoplanet Sci Inst, CALTECH, Pasadena, CA 91125 USA

[6] Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA

[7] Univ Calif Berkeley, Astron Dept, Berkeley, CA 94720 USA

[8] CALTECH, Pasadena, CA 91125 USA

[9] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

来源：

OPTICAL AND INFRARED INTERFEROMETRY II | 2010年 / 7734卷

基金：

美国国家航空航天局;

关键词：

stars:; emission-line; Be; circumstellar matter stars: individual (48 Lib); techniques: interferometric; techniques: spectroscopic infrared: stars; ONE-ARMED OSCILLATIONS; ZETA TAURI; CIRCUMSTELLAR DISK; CYCLIC VARIABILITY;

D O I：

10.1117/12.856922

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Recently, the Keck interferometer was upgraded to do self-phase-referencing (SPR) assisted K-band spectroscopy at R similar to 2000. This means, combining a spectral resolution of 150 km/s with an angular resolution of 2.7 mas, while maintaining high sensitiviy. This SPR mode operates two fringe trackers in parallel, and explores several infrastructural requirements for off-axis phase-referencing, as currently being implemented as the KI-ASTRA project. The technology of self-phase-referencing opens the way to reach very high spectral resolution in near-infrared interferometry. We present the scientific capabilities of the KI-SPR mode in detail, at the example of observations of the Be-star 48 Lib. Several spectral lines of the cirumstellar disk are resolved. We describe the first detection of Pfund-lines in an interferometric spectrum of a Be star, in addition to Br gamma. The differential phase signal can be used to (i) distinguish circum-stellar line emission from the star, (ii) to directly measure line asymmetries tracing an asymetric gas density distribution, (iii) to reach a differential, astrometric precision beyond single-telescope limits sufficient for studying the radial disk structure. Our data support the existence of a radius-dependent disk density perturbation, typically used to explain slow variations of Be-disk hydrogen line profiles.

引用

页数：6

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