Results 21 to 30 of about 3,177 (205)
High-velocity Circumstellar Gas Orbiting a White Dwarf Star
The Astrophysical JournalNumerous white dwarf stars are known to be orbited by disks of gas and dust. To date, broad, ∼300 km s ^−1 wide, gaseous circumstellar absorption features have only been reported for the already iconic WD 1145+017, where one is witnessing the breakup of ...
B. Zuckerman +8 more
doaj +3 more sources
The Circumstellar Gas of Phi Leonis in the UV [PDF]
The Astronomical Journal, 2021 Abstract HST UV spectra were obtained to study whether the φ Leo system has one or more stellar companions, as shown for the A-star dwarf, HR10, stellar pulsation, or transiting exocomets.
C. A. Grady +4 more
openaire +1 more source
Planet–planet scattering in circumstellar gas disks [PDF]
Astronomy and Astrophysics, 2010 Astronomy and Astrophysics Letters, in ...
MARZARI, FRANCESCO +2 more
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The Imprint of Massive Stellar Evolution on Circumstellar Gas [PDF]
Symposium - International Astronomical Union, 1995 We follow the interaction of massive stars with their circumstellar media over their entire lifetimes by combining several numerical models. We use a stellar evolution model for 35 and 60 M⊙ stars (Langer et al. in preparation) as inner boundary conditions for one- and two-dimensional gas dynamical models of the circumstellar medium using ZEUS (Stone ...
Guillermo García-Segura +2 more
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Type-Ia supernovae in dense circumstellar gas [PDF]
Astronomy Letters, 2004 We propose a simple model for the bolometric light curve of type Ia supernova exploding in a dense circumstellar (CS) envelope to describe the light curves of supernovae 2002ic and 1997cy. The modeling shows that at the radius $\sim7\times10^{15}$ cm the density of CS envelopes around both supernovae is similar.
Chugai, N. N., Yungelson, L. R.
openaire +2 more sources
Detection of nitrogen gas in the β Pictoris circumstellar disc [PDF]
Astronomy & Astrophysics, 2019 Context. The gas composition of the debris disc surrounding β Pictoris is rich in carbon and oxygen relative to solar abundances. Two possible scenarios have been proposed to explain this enrichment. The preferential production scenario suggests that the produced gas may be naturally rich in carbon and oxygen, while the alternative preferential ...
P. A. Wilson +6 more
openaire +5 more sources
Mean gas opacity for circumstellar environments and equilibrium temperature degeneracy [PDF]
, 2014 Context. In a molecular cloud dust opacity typically dominates over gas opacity, yet in the vicinities of forming stars dust is depleted, and gas is the sole provider of opacity.
H. Klahr +4 more
core +1 more source
, 2021 Circumstellar chemistry refers to the group of processes able to transform the chemical nature of a cloud of gas and dust surrounding a star. This general definition encompasses both young and evolved stars out of the main sequence, those which may host ...
Marcelino Agúndez, Agúndez, Marcelino
core +1 more source
Detection of circumstellar gas associated with GG Tauri
The Astrophysical Journal, 1993 Double-peaked (C-12)O (1-0) emission centered on the young T Tauri star GG Tau possesses a line profile which may be modeled on the assumption that CO emission arises in an extended circumstellar disk. While bounds on the observed gas mass can be estimated on this basis, it is suggested that a large amount of mass could lie within a small and optically
SKRUTSKIE, MF +8 more
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Sustained Kozai–Lidov Oscillations in Misaligned Circumstellar Gas Disks [PDF]
The Astrophysical Journal Letters, 2021 Abstract A disk around one component of a binary star system with sufficiently high inclination can undergo Kozai–Lidov (KL) oscillations during which the disk inclination and disk eccentricity are exchanged. Previous studies show that without a source of accretion, KL unstable disks exhibit damped oscillations, due to viscous ...
Jeremy L. Smallwood +2 more
openaire +2 more sources