Results 91 to 100 of about 13,144 (210)

Interferometric Upper Limits on Millimeter Polarization of the Disks around DG Tau, GM Aur, and MWC 480

, 2013
Millimeter-wavelength polarization measurements offer a promising method for probing the geometry of magnetic fields in circumstellar disks. Single dish observations and theoretical work have hinted that magnetic field geometries might be predominantly ...
Hughes, A. M., Hull, C. L. H., Plambeck, R. L., Wilner, D. J.   +3 more
core   +1 more source

The formation of polycyclic aromatic hydrocarbons in evolved circumstellar environments [PDF]

, 2010
The formation of Polycyclic Aromatic Hydrocarbons in the circumstellar outflows of evolved stars is reviewed, with an emphasis on carbon stars on the Asymptotic Giant Branch.
Cherchneff, Isabelle
core   +2 more sources

Dust Echoes from Luminous Fast Blue Optical Transients

The Astrophysical Journal, 2023
Luminous fast blue optical transients (LFBOTs) such as AT2018cow form a rare class of engine-powered explosions of uncertain origin. A hallmark feature of these events is radio/millimeter synchrotron emission powered by the interaction of fast ≳0.1 c ...
Brian D. Metzger, Daniel A. Perley
doaj   +1 more source

A MODEL OF SILICATE GRAIN NUCLEATION AND GROWTH IN CIRCUMSTELLAR OUTFLOWS

The Astrophysical Journal, 2011
Based on its abundance, high bond energy, and recent measurements of its vapor pressure SiO is a natural candidate for dust nucleation in circumstellar outflows around asymptotic giant branch stars. In this paper, we describe a model of the nucleation and growth of silicate dust in such outflows.
John A. Paquette, Frank T. Ferguson, Joseph A. Nuth   +2 more
openaire   +1 more source

The M-type stars [PDF]

The papers in this volume cover the following topics: (1) basic properties and photometric variability of M and related stars; (2) spectroscopy and nonthermal processes; (3) circumstellar radio molecular lines; (4) circumstellar shells, the formation of ...
Goldberg, Leo, Johnson, Hollis Ralph, Jordan, Stuart, Pecker, Jean-Claude, Querci, Francois R., Thomas, Richard   +5 more
core   +1 more source

A Theoretical Study of Carbon Nanotube Formation: Carriers of the Diffuse Interstellar Bands?

The Astrophysical Journal
Density functional theory (DFT) calculations have been conducted to probe the formation of carbon nanotubes (CNTs) from graphitic sheets in the presence of a simulated circumstellar shock wave.
A. Thakur, P. J. Lohr, J. J. Bernal, A. Asaduzzaman, K. Muralidharan, T. J. Zega, L. M. Ziurys   +6 more
doaj   +1 more source

Seed particle formation for silicate dust condensation by SiO nucleation [PDF]

, 2013
Clustering of the abundant SiO molecules has been discussed as a possible mechanism of seed particle formation for silicate dust in stellar outflows with an oxygen rich element mixture.
Gail, H. -P., Pucci, A., Tamanai, A., Wetzel, S.   +3 more
core   +1 more source

The last gasps of VY CMa: Aperture synthesis and adaptive optics imagery

, 1998
We present new observations of the red supergiant VY CMa at 1.25 micron, 1.65 micron, 2.26 micron, 3.08 micron and 4.8 micron. Two complementary observational techniques were utilized: non-redundant aperture masking on the 10-m Keck-I telescope yielding ...
B. Lopez, Bensammar S., Benson J. M., C. A. Haniff, Cornwell T. J., Cruzalebes P., David P., Efstathiou A., Gull S. F., Haniff C. A., Heger A., Heger A., Hogbom J., J. D. Monnier, Jennison R. C., Lacombe F., Le Bertre T., Le Sidaner P., Lopez B., Maihara T., Morris M., Ossenkopf V., P. Cruzalebes, P. G. Tuthill, Papoular R., Stone R. C., Tuthill P. G., W. C. Danchi, Wallerstein G., Wilson R. W.   +29 more
core   +1 more source

Silicates in D-type symbiotic stars: an ISO overview [PDF]

, 2007
We investigate the IR spectral features of a sample of D-type symbiotic stars. Analyzing unexploited ISO-SWS data, deriving the basic observational parameters of dust bands and comparing them with respect to those observed in other astronomical sources ...
Allen D. A., Anandarao B. G., de Graauw T., Evans A., Feast M. W., Formiggini L., Girard T., Jaeger C., Jaeger C., M. Contini, Martin-Pintado J., Muerset U., Nussbaumer H., Nussbaumer H., Nussbaumer H., P. Rafanelli, Pegourie B., Posch T., R. Angeloni, S. Ciroi, Schilke P., Webster B. L., Willson L. A.   +22 more
core   +2 more sources

The First Detailed Look at a Brown Dwarf Disk

, 2003
The combination of mid-infrared and recent submm/mm measurements allows us to set up the first comprehensive spectral energy distribution (SED) of the circumstellar material around a young Brown Dwarf.
C. P. Dullemond, Comeron F., D. Apai, I. Pascucci, Itoh Y., Manske V., Persi P., Th. Henning   +7 more
core   +1 more source