Publications (25)
Magellanic Cloud Planetary Nebulae: A Fresh Look at the Relations between Nebular and Stellar Evolution
L. Stanghellini, R. A. Shaw, J. C. Blades +1
Studies of the relationship between planetary nebula morphology and the evolution of the central stars has long suffered from uncertainties in distance determinations, and from the…
The Chandra Planetary Nebulae Survey (ChanPlaNS): III. X-ray Emission from the Central Stars of Planetary Nebulae
R. Montez, J. H. Kastner, B. Balick +25
We present X-ray spectral analysis of 20 point-like X-ray sources detected in Chandra Planetary Nebula Survey (ChanPlaNS) observations of 59 planetary nebulae (PNe) in the solar ne…
Carbon Abundances in the Small Magellanic Cloud Planetary Nebulae
T. -H. Lee, L. Stanghellini, R. A. Shaw +2
As an ongoing study of Magellanic Cloud PNe we have obtained UV spectra of 9 PNe in the SMC to measure their carbon abundances. The spectra have been acquired with ACS HRC/PR200L a…
Carbon abundance in Small Magellanic Cloud planetary nebulae through Advanced Camera for Surveys prism spectroscopy: constraining stellar evolution at low metallicity
L. Stanghellini, T. -H. Lee, R. A. Shaw +2
We perform near ultraviolet ACS prism spectroscopy of 11 Small Magellanic Cloud (SMC) planetary nebulae (PNe) with the main aim of deriving the abundance of carbon. The analysis of…
A Panchromatic Catalog of Early-Type Galaxies at Intermediate Redshift in the Hubble Space Telescope Wide Field Camera 3 Early Release Science Field
M. J. Rutkowski, S. H. Cohen, S. Kaviraj +24
In the first of a series of forthcoming publications, we present a panchromatic catalog of 102 visually-selected early-type galaxies (ETGs) from observations in the Early Release S…
The Emerging Planetary Nebula CRL 618 and its Unsettled Central Star(s)
B. Balick, A. Riera, A. Raga +2
We report deep long-slit emission-line spectra, the line flux ratios, and Doppler profile shapes of various bright optical lines. The low-ionization lines (primarily [N I], [O I],…
The Chandra X-ray Survey of Planetary Nebulae (ChanPlaNS): Probing Binarity, Magnetic Fields, and Wind Collisions
J. H. Kastner, R. Montez, B. Balick +23
We present an overview of the initial results from the Chandra Planetary Nebula Survey (ChanPlaNS), the first systematic (volume-limited) Chandra X-ray Observatory survey of planet…
Abundances of Disk Planetary Nebulae in M31 and the Radial Oxygen Gradient
K. B. Kwitter, E. M. M. Lehman, B. Balick +1
We have obtained spectra of 16 planetary nebulae in the disk of M31 and determined the abundances of He, N, O, Ne, S and Ar. Here we present the median abundances and compare them…
HST Measurements of the Expansion of NGC 6543: Parallax Distance and Nebular Evolution
D. S. Reed, B. Balick, A. R. Hajian +5
The optical expansion parallax of NGC 6543 has been detected and measured using two epochs of HST images separated by a time baseline of only three years. We have utilized three se…
Models of the Mass-Ejection Histories of pre Planetary Nebulae, III. The Shaping of Lobes by post-AGB Winds
B. Balick, A. Frank, B. Liu
We develop a physical framework for interpreting high-resolution images of pre planetary nebule ("prePNe") with pairs of candle shaped lobes. We use hydrodynamical models to infer…
Hen 2-104: A close-up look at the Southern Crab
M. Santander-Garcia, R. L. M. Corradi, A. Mampaso +5
The kinematics, shaping, density distribution, expansion distance, and ionized mass of the nebula Hen 2-104, and the nature of its symbiotic Mira are investigated. A combination of…
The chemistry of planetary nebulae in the outer regions of M31
R. L. M. Corradi, K. B. Kwitter, B. Balick +2
We present spectroscopy of nine planetary nebulae (PNe) in the outskirts of M31, all but one obtained with the 10.4m GTC telescope. These sources extend our previous study of the o…
Temperature Variations from HST Imagery and Spectroscopy of NGC 7009
R. H. Rubin, N. J. Bhatt, R. J. Dufour +8
We present new HST/WFPC2 imagery and STIS long-slit spectroscopy of the planetary nebula NGC 7009. The primary goal was to obtain high spatial resolution of the intrinsic line rati…
Rings and arcs around evolved stars. II. The Carbon Star AFGL 3068 and the Planetary Nebulae NGC 6543, NGC 7009 and NGC 7027
M. A. Guerrero, G. Ramos-Larios, J. A. Toala +2
We present a detailed comparative study of the arcs and fragmented ring-like features in the haloes of the planetary nebulae (PNe) NGC 6543, NGC 7009, and NGC 7027 and the spiral p…
The Herschel Planetary Nebula Survey (HerPlaNS) I. Data Overview and Analysis Demonstration with NGC 6781
T. Ueta, D. Ladjal, K. M. Exter +30
This is the first of a series of investigations into far-IR characteristics of 11 planetary nebulae (PNs) under the Herschel Space Observatory Open Time 1 program, Herschel Planeta…
The Size Evolution of Passive Galaxies: Observations from the Wide Field Camera 3 Early Release Science Program
R. E. Ryan, P. J. McCarthy, S. H. Cohen +28
We present results on the size evolution of passively evolving galaxies at 1<z<2 drawn from the Wide Field Camera 3 Early Release Science program. Our sample was constructed using…
Nebular Abundance Errors
J. Alexander, B. Balick
The errors inherent to the use of the standard "ionization correction factor" ("i_CF") method of calculating nebular conditions and relative abundances of H, He, N, O, Ne, S, and A…
On the Production of He, C and N by Low and Intermediate Mass Stars: A Comparison of Observed and Model-Predicted Planetary Nebula Abundances
R. B. C. Henry, B. G. Stephenson, M. M. Miller Bertolami +2
The primary goal of this paper is to make a direct comparison between the measured and model-predicted abundances of He, C and N in a sample of 35 well-observed Galactic planetary…
UV-dropout Galaxies in the GOODS-South Field from WFC3 Early Release Science Observations
N. P. Hathi, R. E. Ryan, S. H. Cohen +22
We combine new high sensitivity ultraviolet (UV) imaging from the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST) with existing deep HST/Advanced Camera for Surveys…
Towards a Spectral Technique for Determining Material Geometry Around Evolved Stars: Application to HD 179821
J. Nordhaus, I. Minchev, B. Sargent +6
HD 179821 is an evolved star of unknown progenitor mass range (either post-Asymptotic Giant Branch or post-Red Supergiant) exhibiting a double peaked spectral energy distribution (…
Stellar Populations of Lyman Break Galaxies at z=1-3 in the HST/WFC3 Early Release Science Observations
N. P. Hathi, S. H. Cohen, R. E. Ryan +24
We analyze the spectral energy distributions (SEDs) of Lyman break galaxies (LBGs) at z=1-3 selected using the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) UVIS channel…
The Chandra Planetary Nebula Survey (ChanPlaNS). II. X-ray Emission from Compact Planetary Nebulae
M. Freeman, R. Montez, J. H. Kastner +24
We present results from the most recent set of observations obtained as part of the Chandra X-ray observatory Planetary Nebula Survey (ChanPlaNS), the first comprehensive X-ray sur…
Hubble Space Telescope WFC3 Early Release Science: Emission-Line Galaxies from Infrared Grism Observations
A. N. Straughn, H. Kuntschner, M. Kuemmel +30
We present grism spectra of emission-line galaxies (ELGs) from 0.6-1.6 microns from the Wide Field Camera 3 on the Hubble Space Telescope. These new infrared grism data augment pre…
Co-spatial Long-slit UV/Optical Spectra of Ten Galactic Planetary Nebulae with HST/STIS II. Nebular Models, Central Star Properties and He+CNO Synthesis
R. B. C. Henry, B. Balick, R. J. Dufour +5
The goal of the present study is twofold. First, we employ new HST/STIS spectra and photoionization modeling techniques to determine the progenitor masses of eight planetary nebula…
Disk Formation by AGB Winds in Dipole Magnetic Fields
S. Matt, B. Balick, R. Winglee +1
We present a simple, robust mechanism by which an isolated star can produce an equatorial disk. The mechanism requires that the star have a simple dipole magnetic field on the surf…