Mass Loss History of the AGB star, R Cas (2009)
Ueta, Toshiya, Stencel, Robert E., Yamamura, Issei, Izumiura, Hideyuki, Nakada, Yoshikazu, Matsuura, Mikako, ...
We report here on the discovery of an extended far-infrared shell around the AGB star, R Cassiopeia, made by AKARI and Spitzer. The extended, cold circumstellar shell of R Cas spans nearly 3 arcmin...
Ueta, Toshiya, Izumiura, Hideyuki, Yamamura, Issei, Stencel, Robert E., Nakada, Yoshikazu, Matsuura, Mikako, ...
Recent far-infrared mapping of mass-losing stars by the AKARI Infrared Astronomy Satellite and Spitzer Space Telescope have suggested that far-infrared bow shock structures are probably ubiquitous...
Cometary Astropause of Mira Revealed in the Far-Infrared (2008)
Evolved mass-losing stars such as Mira enrich the interstellar medium (ISM) significantly by their dust-rich molecular wind. When these stars move fast enough relative to the ISM, the interaction...
Bernard, Jean-Philippe, Reach, William T., Paradis, Deborah, Meixner, Margaret, Paladini, Roberta, Kawamura, Akiko, ...
The goal of this paper is to present the results of a preliminary analysis of the extended infrared (IR) emission by dust in the interstellar medium (ISM) of the Large Magellanic Cloud (LMC). We...
AKARI/FIS Mapping of the ISM-Wind Bow Shock around Alpha Ori (2008)
Ueta, Toshiya, Izumiura, Hideyuki, Yamamura, Issei, Nakada, Yoshikazu, Matsuura, Mikako, Ita, Yoshifusa, ...
We present 10' x 50' scan maps around an M supergiant Alpha Ori at 65, 90, 140 and 160 microns obtained with the AKARI Infrared Astronomy Satellite. Higher spatial resolution data with the exact...
Ueta, Toshiya, Murakawa, Koji, Meixner, Margaret
The structure of the dusty circumstellar envelopes (CSEs) of proto-planetary nebulae (PPNs) reveals the mass-loss history of these sources and how such histories may differ for elliptical (SOLE) and...
Detached shells as tracers of AGB-ISM bow shocks (2006)
Wareing, C. J., Zijlstra, Albert A., Speck, Angela K., O'Brien, T. J., Ueta, Toshiya, Elitzur, M., ...
New Spitzer imaging observations have revealed the structure around the Mira variable star R Hya to be a one-sided parabolic arc 100 arcsec to the West stretching from North to South. We successfully...
We present the far-infrared (IR) maps of a bipolar planetary nebula (PN), NGC 650, at 24, 70, and 160 micron taken with the Multiband Imaging Photometer for Spitzer (MIPS) on-board the Spitzer Space...
Meixner, Margaret, Gordon, Karl D., Indebetouw, Remy, Hora, Joseph L., Whitney, Barbara, Blum, Robert, ...
We are performing a uniform and unbiased, ~7x7 degrees imaging survey of the Large Magellanic Cloud (LMC), using the IRAC and MIPS instruments on board the Spitzer Space Telescope in order to survey...
Proper-Motion Measurements of the Cygnus Egg Nebula (2005)
Ueta, Toshiya, Murakawa, Koji, Meixner, Margaret
We present the results of proper-motion measurements of the dust shell structure in the Egg Nebula (AFGL 2688, CRL 2688, V1610 Cyg), based on the archived two-epoch imaging-polarimetry data in the 2...
Ueta, Toshiya, Murakawa, Koji, Meixner, Margaret
Using NICMOS on HST, we have performed imaging polarimetry of proto-planetary nebulae. Our objective is to study the structure of optically thin circumstellar shells of post-asymptotic giant branch...
HD 161796 (IRAS 17436+5003) (2003)
Past imaging observations of a post-AGB star, HD 161796, have probed different parts of its circumstellar shell which correspond to different epochs of the star's AGB mass loss history. While the...
HST/NICMOS Imaging Polarimetry of PPNs (2003)
Ueta, Toshiya, Murakawa, Koji, Meixner, Margaret
We present the preliminary results from our HST/NICMOS imaging polarimetry on optically thin PPNs. The data show the dust distribution in an unprecedented detail. The structure of these faint PPNs is...
Near-Infrared Photometric Survey of Proto-Planetary Nebula Candidates (2003)
Ueta, Toshiya, Meixner, Margaret, Moser, Danielle E., Pyzowski, Lukasz A., Davis, Jason S.
We present JHK' photometric measurements of 78 objects mostly consisting of proto-planetary nebula candidates. Photometric magnitudes are determined by means of imaging and aperture photometry....
2-Dust : a Dust Radiative Transfer Code for an Axisymmetric System (2002)
Ueta, Toshiya, Meixner, Margaret
We have developed a general purpose dust radiative transfer code for an axisymmetric system, 2-Dust, motivated by the recent increasing availability of high-resolution images of circumstellar dust...
Westbrook's Molecular Gun: Discovery of Near-IR Micro-Structures in AFGL 618 (2001)
Ueta, Toshiya, Fong, David, Meixner, Margaret
We present high-sensitivity near-IR images of a carbon-rich proto-planetary nebula, AFGL 618, obtained with the Subaru Telescope. These images have revealed ``bullets'' and ``horns'' extending...
Morphological Properties of PPNs: Mid-IR and HST Imaging Surveys (2000)
Ueta, Toshiya, Meixner, Margaret
We will review our mid-infrared and HST imaging surveys of the circumstellar dust shells of proto-planetary nebulae. While optical imaging indirectly probes the dust distribution via dust-scattered...
Spatial Distributions of Multiple Dust Components in the PPN/PN Dust Shells (2000)
Ueta, Toshiya, Speck, Angela K., Meixner, Margaret, Dayal, Aditya, Hora, Joseph L., Fazio, Giovanni G., ...
We investigate spatial distributions of specific dust components in the circumstellar shells of a proto-planetary nebula candidate, HD 179821, and a planetary nebula, BD$+30^{\circ}$3639, by means of...
Ueta, Toshiya, Meixner, Margaret, Dayal, Aditya, Deutsch, Lynne K., Fazio, Giovanni, Hora, Joseph L., ...
We report detection of an extended mid-infrared emission from \iras 18576+0341 (AFGL 2298). The object shows a dusty circumstellar shell that has diameter of $\age 7\arcsec$ at 10.3 and 18.0 $\um$....
Ueta, Toshiya, Meixner, Margaret, Bobrowsky, Matthew
We summarize results of our {\it HST} imaging survey of proto-planetary nebula (PPN) candidates, in which we discovered two types of axisymmetric reflection nebulosities. The Star-Obvious...
Ueta, Toshiya, Meixner, Margaret, Bobrowsky, Matthew
We report the results from an optical imaging survey of proto-planetary nebula candidates using the HST. We exploited the high resolving power and wide dynamic range of HST and detected nebulosities...
A Mid-Infrared Imaging Survey of Proto-Planetary Nebula Candidates (1998)
Meixner, Margaret, Ueta, Toshiya, Dayal, Aditya, Hora, Joseph L., Fazio, Giovanni, Hrivnak, Bruce J., ...
We present the data from a mid-infrared imaging survey of 66 proto-planetary nebula candidates using two mid-IR cameras (MIRAC2 and Berkcam) at the NASA Infrared Telescope Facility and the United...