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Massive-Star Supernovae as Major Dust Factories
- B. Sugerman, B. Ercolano, R. Kennicutt
- PhysicsScience
- 6 June 2006
TLDR
Dust features in the 10-mu m infrared spectra of oxygen-rich evolved stars
- A. Speck, M. Barlow, R. Sylvester, A. Hofmeister
- Physics
- 1 November 2000
We have analyzed the 8 13:5 mU KIRT CGS3 spectra of 142 M-type stars including 80 oxygen- rich AGB stars and 62 red supergiants, with a view to understanding the dierences and similarities between…
A FIREWORK OF H2 KNOTS IN THE PLANETARY NEBULA NGC 7293 (THE HELIX NEBULA)
- M. Matsuura, A. Speck, R. Wesson
- Physics
- 8 July 2009
We present a deep and wide field-of-view (4' x 7') image of the planetary nebula (PN) NGC 7293 (the Helix Nebula) in the 2.12 {mu}m H{sub 2} v = 1 {yields} 0 S(1) line. The excellent seeing (0.''4)…
Silicon Carbide Absorption Features: Dust Formation in the Outflows of Extreme Carbon Stars
- A. Speck, A. Corman, K. Wakeman, C. Wheeler, G. Thompson
- Physics
- 15 October 2008
Infrared carbon stars without visible counterparts are generally known as extreme carbon stars. We have selected a subset of these stars with absorption features in the 10-13 μm range, which has been…
Large-Scale Extended Emission around the Helix Nebula: Dust, Molecules, Atoms, and Ions
- A. Speck, M. Meixner, D. Fong, P. McCullough, D. Moser, T. Ueta
- Physics
- 2002
We present new observations of the ionized gas, molecular gas, and cool dust in the Helix Nebula (NGC 7293). The ionized gas is observed in the form of an Himage, which is constructed using images…
The nature of the silicon carbide in carbon star outflows
- A. Speck, M. Barlow, C. Skinner
- Physics
- 21 June 1997
The Effect of Stellar Evolution on SiC Dust Grain Sizes
- A. Speck, G. T. Hofmeister
- Physics
- 4 August 2005
Stars on the asymptotic giant branch (AGB) produce dust in their circumstellar shells. The nature of the dust-forming environment is influenced by the evolution of the stars, in terms of both…
An Introduction to the Physics of Interstellar Dust
- A. Speck
- Physics
- 1 October 2008
The Dielectric Permeability How the electromagnetic field acts on dust The harmonic oscillator Waves in a conducting medium How to Evaluate Grain Cross Sections Defining cross sections The optical…
The Multitude of Molecular Hydrogen Knots in the Helix Nebula
- M. Meixner, P. McCullough, J. Hartman, M. Son, A. Speck
- Physics
- 29 September 2005
We present Hubble Space Telescope NICMOS imaging of the H2 2.12 μm emission in five fields in the Helix Nebula ranging in radial distance from 250'' to 450'' from the central star. The images reveal…
Processing of Presolar Grains around Post-Asymptotic Giant Branch Stars: Silicon Carbide as the Carrier of the 21 Micron Feature
- A. Speck, A. Hofmeister
- Physics
- 10 January 2004
Some proto–planetary nebulae (PPNs) exhibit an enigmatic feature in their infrared spectra at � 21 m. This feature is not seen in the spectra of either the precursors to PPNs, the asymptotic giant…
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