Van Loon, Jacco Th., Oliveira, Joana M., Gordon, Karl D., Meixner, Margaret, Shiao, Bernie, Boyer, Martha L., ...
[abridged] We present 52-93 micron spectra obtained with Spitzer in the MIPS-SED mode, of a representative sample of luminous compact far-IR sources in the LMC. These include carbon stars, OH/IR AGB...
Mizuno, Yoji, Kawamura, Akiko, Onishi, Toshikazu, Minamidani, Tetsuhiro, Muller, Erik, Yamamoto, Hiroaki, ...
New 12CO J=4-3 and 13CO J=3-2 observations of the N159 region in the Large Magellanic Cloud have been made. The 12CO J=4-3 distribution is separated into three clumps. These new measurements toward...
Dust Production and Mass Loss in the Galactic Globular Cluster NGC 362 (2009)
Boyer, Martha L., McDonald, Iain, Van Loon, Jacco Th., Gordon, Karl D., Babler, Brian, Block, Miwa, ...
We investigate dust production and stellar mass loss in the Galactic globular cluster NGC 362. Due to its close proximity to the Small Magellanic Cloud (SMC), NGC 362 was imaged with the IRAC and...
Near-Infrared Photometric Survey of Herbig Ae/Be Candidate Stars (2009)
Doering, Ryan L., Meixner, Margaret
We report near-infrared photometric measurements of 35 Herbig Ae/Be candidate stars obtained with direct imaging and aperture photometry. Observations were made through the broadband J, H, and K'...
Spatial Variations of Dust Abundances Across the Large Magellanic Cloud (2009)
Paradis, Déborah, Reach, William T., Bernard, Jean-Philippe, Block, Miwa, Engelbracht, Chad W., Gordon, Karl, ...
Using the data obtained with the Spitzer Space Telescope as part of the Surveying the Agents of a Galaxy's Evolution (SAGE) legacy survey, we have studied the variations of the dust composition and...
Spatial variations of dust abundances across the Large Magellanic Cloud (2009)
Paradis, Deborah, Reach, William T., Bernard, Jean-Philippe, Block, Miwa, Engelbracht, Chad W., Gordon, Karl, ...
Using the data obtained with the Spitzer Space telescope as part of the Surveying the Agents of a Galaxy's Evolution (SAGE) legacy survey, we have studied the variations of the dust composition and...
Srinivasan, Sundar, Meixner, Margaret, Leitherer, Claus, Vijh, Uma, Volk, Kevin, Blum, Robert D., ...
We present empirical relations describing excess emission from evolved stars in the Large Magellanic Cloud (LMC) using data from the SAGE (Surveying the Agents of a Galaxy's Evolution) survey which...
V1647 Orionis: Reinvigorated Accretion and the Re-Appearance of McNeil's Nebula (2009)
Aspin, Colin, Reipurth, Bo, Beck, Tracy L., Aldering, Greg, Doering, Ryan L., Hammel, Heidi B., ...
In late 2003, the young eruptive variable star V1647 Orionis optically brightened by over 5 magnitudes, stayed bright for around 26 months, and then decline to its pre-outburst level. In August 2008...
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...
An Extremely Bright Echo Associated With SN 2002hh (2007)
Welch, D. L., Clayton, Geoffrey C., Campbell, Amy, Barlow, M. J., Sugerman, Ben E. K., Meixner, Margaret, ...
We present new, very late-time optical photometry and spectroscopy of the interesting Type II-P supernova, SN 2002hh, in NGC 6946. Gemini/GMOS-N has been used to acquire visible spectra at six epochs...
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...
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...
Massive-Star Supernovae as Major Dust Factories (2006)
Sugerman, Ben E. K., Ercolano, Barbara, Barlow, M. J., Clayton, Geoffrey C., Zijlstra, Albert A., ...
We present late-time optical and mid-infrared observations of the Type-II supernova 2003gd in NGC 628. Mid-infrared excesses consistent with cooling dust in the ejecta are observed 499-678 days after...
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...
The Multitude of Molecular Hydrogen Knots in the Helix Nebula (2005)
Meixner, Margaret, McCullough, Peter, Hartman, Joel, Son, Minho, Speck, Angela
We present HST/NICMOS imaging of the H_2 2.12 \mu m emission in 5 fields in the Helix Nebula ranging in radial distance from 250-450" from the central star. The images reveal arcuate structures with...
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...
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...
1. PERSONNEL During this report year the scientific staff consisted of the (1999)
R. Dickel, John R. Dickel, Brian Fields, Charles Gammie, ...
This report covers activities of the department for the period 1 September 1999 - 31 August 2000
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...
Thesis (Ph. D. in Astronomy)--University of California, Berkeley, May 1994.