Results 101 to 110 of about 4,364 (222)

The dusty envelopes of asymptotic giant branch stars with ultraviolet excesses

Astronomy & Astrophysics
Context. Roughly spherical envelopes around asymptotic giant branch (AGB) stars transform into the highly asymmetric morphologies observed in planetary nebulae.
Alonso-Hernández J., Sánchez Contreras C., Sahai R., Sanz-Forcada J.   +3 more
doaj   +1 more source

Study of variable extinction of hot stars with circumstellar dust shells [PDF]

, 1984
Various projects on the topic of hot stars with circumstellar dust are reported. The surface temperature, wind speed, and interstellar reddening were determined for the variable WC7 star HD 193793.

core   +1 more source

THE SPECTRAL ENERGY DISTRIBUTION OF HH 30 IRS: CONSTRAINING THE CIRCUMSTELLAR DUST SIZE DISTRIBUTION [PDF]

, 2001
We present spectral energy distribution (SED) models for the edge-on classical T Tauri star HH 30 IRS that indicate that dust grains have grown to larger than 50 km within its circumstellar disk.
J. E. Bjorkman, Wood, Kenneth, Wolff, MJ, Michael J. Wolff, Bjorkman, JE, Whitney, B, Kenneth Wood, Barbara Whitney   +7 more
core   +1 more source

THE SPECTROSCOPY OF THE PULSATING CARBON STAR R Lep

Odessa Astronomical Publications, 2017
The first results of detailed spectroscopy are presented for carbon Mira R Leporis. This long-period variable is undergoing deep fadings, apparently caused by dust formation around the star.
L. Zacs, O. Alksnis
doaj   +1 more source

Circumstellar gas and dust in 68 Ophiuchi (A0IVe) [PDF]

, 1995
We present photometry and spectroscopy of the A0IVe star 68 Ophiuchi, for which Vidal-Madjar et al. (1993) suspected the presence of a circumstellar disc of material similar to that found around beta Pic.
Sandell, G., Bontekoe, T.R., Oudmaijer, R.D., Waters, L.B.F.M., Bontekoe, Tj. R., Geballe, T.R., Grady, C. A., Vega, R., van den Ancker, M. E., Waters, L. B. F. M., Oudmaijer, R. D., Baas, F., van Winckel, H., van den Ancker, M.E., van der Bliek, N.S., Thé, P. S., Kester, D.J.M., Geballe, T. R., Grady, C.A., Kester, D. J. M., van der Bliek, N. S., The, P.S.   +21 more
core   +2 more sources

A Possible Indication of Metallic Iron in White Dwarf Dusty Disks from Their “Dirtiness”

The Astrophysical Journal
Polluted white dwarfs provide unique constraints on the elemental compositions of planetary bodies. The tidal disruption of accreting bodies is thought to form circumstellar dusty disks, whose emission spectra could offer additional insights into the ...
Ayaka Okuya, Satoshi Okuzumi, Aki Takigawa, Hanako Enomoto   +3 more
doaj   +1 more source

Circumstellar dust around FU Orionis stars [PDF]

Symposium - International Astronomical Union, 1987
It is immediately apparent from IRAS and other far infrared data (figure 1) that all known FU Orionis stars, or fuors, are associated with substantial amounts of cool circumstellar dust.The pre-outburst magnitudes for V1057 Cyg indicate that this star was immersed in circumstellar dust already before its flare-up in 1969–1970, and hence that this dust ...
openaire   +1 more source

The Morphology of the Asteroidal Dust around White Dwarf Stars: Optical and Near-infrared Pulsations in G29-38

The Astrophysical Journal
More than 36 yr have passed since the discovery of the infrared excess from circumstellar dust orbiting the white dwarf G29-38, which at 17.5 pc it is the nearest and brightest of its class.
Ted von Hippel, J. Farihi, J. L. Provencal, S. J. Kleinman, J. E. Pringle, A. Swan, G. Fontaine, J. J. Hermes, J. Sargent, Z. Savery, W. Cooper, V. Kim, V. Kozyreva, M. Krugov, A. Kusakin, A. Moss, W. Ogloza, Erika Pakštienė, A. Serebryanskiy, Eda Sonbas, B. Walter, M. Zejmo, S. Zola   +22 more
doaj   +1 more source

Circumstellar dust shells around long-period variables [PDF]

, 2009
Context. Miras and long-period variables (LPVs) are radially pulsating, highly evolved stars on the Asymptotic Giant Branch. Because of peculiar conditions of this objects, their cool, extended atmospheres are ideal sites for the formation of dust ...
C. Dreyer, E. Sedlmayr, M. Hegmann
core   +1 more source

Very Late-time JWST and Keck Spectra of the Oxygen-rich Supernova 1995N

The Astrophysical Journal
We present new JWST/MIRI Medium Resolution Spectroscopy and Keck spectra of SN 1995N obtained in 2022–2023, more than 10,000 days after the supernova (SN) explosion. These spectra are among the latest direct detections of a core-collapse SN, both through
Geoffrey C. Clayton, R. Wesson, Ori D. Fox, Melissa Shahbandeh, Alexei V. Filippenko, Bryony Nickson, Michael Engesser, Schuyler D. Van Dyk, WeiKang Zheng, Thomas G. Brink, Yi Yang, Tea Temim, Nathan Smith, Jennifer Andrews, Chris Ashall, Ilse De Looze, James M. Derkacy, Luc Dessart, Michael Dulude, Eli Dwek, Ryan J. Foley, Suvi Gezari, Sebastian Gomez, Shireen Gonzaga, Siva Indukuri, Jacob Jencson, Joel Johansson, Mansi Kasliwal, Zachary G. Lane, Ryan Lau, David Law, Anthony Marston, Dan Milisavljevic, Richard O’Steen, Justin Pierel, Armin Rest, Arkaprabha Sarangi, Matthew Siebert, Michael Skrutskie, Lou Strolger, Tamás Szalai, Samaporn Tinyanont, Qinan Wang, Brian Williams, Lin Xiao, Szanna Zsíros   +45 more
doaj   +1 more source