Results 181 to 190 of about 1,969,695 (207)
A dynamical study of the circumstellar gas in UX Orionis [PDF]
Astronomy and Astrophysics, 2002 We present the results of a high spectral resolution study of the circumstellar (CS) gas around the intermediate mass, pre-main sequence star UX Ori. The results are based on a set of 10 echelle spectra, monitoring the star on time scales of months, days and hours.
Benjamin Montesinos +2 more
exaly +9 more sources
On the gas temperature in circumstellar disks around A stars [PDF]
Astronomy and Astrophysics, 2001 In circumstellar disks or shells it is often assumed that gas and dust temperatures are equal where the latter is determined by radiative equilibrium. This paper deals with the question whether this assumption is applicable for tenous circumstellar disks around young A stars. In this paper the thin hydrostatic equilibrium models described by Kamp &
Inga Kamp, G -J van Zadelhoff
exaly +6 more sources
Exocomets in the circumstellar gas disk of HD 172555 [PDF]
Astronomy and Astrophysics, 2014 The source HD172555 is a young A7V star surrounded by a debris disk with a gaseous component. Here, we present the detection of variable absorption features detected simultaneously in the Ca II K and H doublet lines (at 3,933 and 3,968 Angstrom). We identified the presence of these absorption signatures at four different epochs in the 129 HARPS high ...
Flavien Kiefer +2 more
exaly +5 more sources
Detection of nitrogen gas in the β Pictoris circumstellar disc [PDF]
Astronomy and 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 ...
Flavien Kiefer +2 more
exaly +6 more sources
Gas infall and possible circumstellar rotation in R Leonis [PDF]
Astronomy and Astrophysics, 2019 We present new interferometer molecular observations of R Leo taken at 1.2 mm with the Atacama Large Millimeter Array with an angular resolution up to ≃0.″026. These observations permitted us to resolve the innermost envelope of this star, which revealed a complex structure that involves extended continuum emission and molecular emission showing a non ...
Núria Marcelino +2 more
exaly +5 more sources
The composition of circumstellar gas and dust in 51 Oph [PDF]
Astronomy and Astrophysics, 2001 4 pages, 3 figures, accepted by A&A (letters)
C Waelkens
exaly +4 more sources
Some of the next articles are maybe not open access.
Related searches:
Related searches:
Observation of Circumstellar Gas in the Neighborhood of RZ Psc
Astrophysics, 2013The first evidence is found of the existence of circumstellar gas in the nearest surroundings of the UX Ori star RZ Psc. Spectra obtained at the Terskol Observatory, Special Astrophysical Observatory (SAO), and the Nordic Optical Telescope (NOT) reveal a strong variability in the sodium doublet lines that is indicative of a sporadic outflow of matter ...
Vladimir Grinin, I S Potravnov
exaly +2 more sources
The origin of the high-velocity circumstellar gas around SN 1998S [PDF]
Monthly Notices of the Royal Astronomical Society, 2002 9 pages, 6 figures. MNRAS, accepted.
Peter Meikle +2 more
exaly +3 more sources
The circumstellar gas of sigma orionis E
Astrophysics and Space Science, 1985In order to explain the variable Hα emission and the eclipse-like light variation of σ Ori E, we investigated the circumstellar gas trapped by the stellar magnetic field and corotating with the star. By considering the potential along the magnetic field line, we found that the gas concentrates to a potential minimum.
exaly +2 more sources
The chemical history of molecules in circumstellar disks [PDF]
Astronomy and Astrophysics, 2011 18 pages, 12 figures, accepted by A& ...
S D Doty
exaly +4 more sources