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...
Silicon carbide absorption features: dust formation in the outflows of extreme carbon stars (2008)
Speck, Angela K., Corman, Adrian B., Wakeman, Kristina, Wheeler, Caleb H., Thompson, Grant
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 $\mu$m range, which has...
The Cosmic Crystallinity Conundrum: Clues from IRAS 17495-2534 (2008)
Speck, Angela K., Whittington, Alan G., Tartar, Josh B.
Since their discovery, cosmic crystalline silicates have presented several challenges to understanding dust formation and evolution. The mid-infrared spectrum of IRAS 17495$-$2534, a highly obscured...
Detached shells as tracers of AGB-ISM bow shocks (2006)
Wareing, C. J., Zijlstra, Albert A., Speck, Angela K., O'Brien, T. J., Ueta, Toshiya, Elitzur, M., ...
New Spitzer imaging observations have revealed the structure around the Mira variable star R Hya to be a one-sided parabolic arc 100 arcsec to the West stretching from North to South. We successfully...
Spatial Distributions of Multiple Dust Components in the PPN/PN Dust Shells (2000)
Ueta, Toshiya, Speck, Angela K., Meixner, Margaret, Dayal, Aditya, Hora, Joseph L., Fazio, Giovanni G., ...
We investigate spatial distributions of specific dust components in the circumstellar shells of a proto-planetary nebula candidate, HD 179821, and a planetary nebula, BD$+30^{\circ}$3639, by means of...