منابع مشابه
The Low Velocity Wind from the Circumstellar Matter around the B9v Star Σ Herculis
We have obtained FUSE spectra of σ Her, a nearby binary system, with a main sequence primary, that has a Vega-like infrared excess. We observe absorption in the excited fine structure lines C II at 1037 Å, N II at 1085 Å, and N II at 1086 Å that are blueshifted by as much as ∼30 km/sec with respect to the star. Since these features are considerably narrower than the stellar lines and broader th...
متن کاملOBSERVATION OF A BURST OF HIGH-VELOCITY DUST FROM a HERCULIS
Interferometric observations of a Herculis at a wavelength of 11.15 mm over the period 1989–2004 show large visibility variations. These variations are interpreted as an ejection of approximately 10 6 M, of material in 1990 that has subsequently expanded and dissipated. The expansion rate is approximately 75 km s , much larger than previous observations. No substantial material has been emitted...
متن کاملThe Stellar Velocity Dispersion of the Lens Galaxy in Mg2016+112 at Z=1.004
We present a direct measurement of the stellar velocity dispersion of the early-type lens galaxy D in the system MG2016+112 (z = 1.004), determined from a spectrum obtained with the Echelle Spectrograph and Imager (ESI) on the W.M. Keck–II Telescope, as part of the Lenses Structure and Dynamics (LSD) Survey. We find a velocity dispersion of σap = 304± 27 km s −1 inside an effective circular ape...
متن کاملAm Herculis Binaries in the Rosat Era
The current census of AM Herculis binaries and AM Her candidates exceeds 50 systems of which 29 are ROSAT discoveries. The increased number provides a basis to study the more general properties of the class. We discuss the space density, observations relevant to the evolution of magnetic CVs, the statistics of magnetic eld measurements, and current ideas on the accretion scenarios.
متن کاملthe effect of taftan pozzolan on the compressive strength of concrete in the environmental conditions of oman sea (chabahar port)
cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of the Pacific
سال: 1926
ISSN: 0004-6280,1538-3873
DOI: 10.1086/123655