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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 448301.0, MPI für Astronomie / Publikationen_mpia
Direct observation of the extended molecular atmosphere of o Ceti by differential spectral Imaging with an adaptive optics system
Authors:Takami, Hideki; Goto, Miwa; Gaessler, Wolfgang; Hayano, Yutaka; Iye, Masanori; Kamata, Yukiko; Kanzawa, Tomio; Kobayashi, Naoto; Minowa, Yosuke; Oya, Shin; Pyo, Tae-Soo; Saint-Jacques, David; Takato, Naruhisa; Terada, Hiroshi; Tokunaga, Alan T.; Tsuji, Takashi
Language:English
Date of Publication (YYYY-MM-DD):2009
Title of Journal:Publications of the Astronomical Society of Japan
Journal Abbrev.:PASJ
Volume:61
Issue / Number:4
Start Page:623
End Page:627
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present new measurements of the diameter of o Ceti (Mira) as a function of wavelength in the 2.2μm atmospheric window using the adaptive optics system and the infrared camera and spectrograph mounted on the Subaru Telescope. We found that the angular size of the star at the wavelengths of CO and H2O absorption lines were up to twice as large as the continuum photosphere. This size difference is attributable to optically thick CO and H2O molecular layers surrounding the photosphere. This measurement is the first direct differential spectroscopic imaging of stellar extension that resolves individual molecular lines with high spectral-resolution observations. This observation technique is extremely sensitive to differences in spatial profiles at different wavelengths; we show that a difference in diameter much smaller than the point spread function can be measured.
Free Keywords:infrared: general; instrumentation: adaptive optics; stars: AGB and post-AGB; stars: individual (o Ceti); techniques: spectroscopic
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2009PASJ...61..623T [ID No:1]
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