We present high resolution (R ∼ 44,000) UVES spectra of the eclipsing premain sequence star KH 15D covering the wavelength range 4780 to 6810 Å obtained at three phases: out of eclipse, near minimum light and during egress. The system evidently acts like a natural coronagraph, enhancing the contrast relative to the continuum of hydrogen and forbidden emission lines during eclipse. At maximum li...

This paper studies the three-dimensional (3-D) ionospheric electron density variation over continental US and adjacent regions during August 2017 Great American Solar Eclipse event, using Millstone Hill incoherent scatter radar observations, ionosonde data, Swarm satellite measurements, a new TEC-based data assimilation system (TIDAS). The TIDAS can reconstruct 3-D distribution regions, with sp...

CONTEXT The tobacco industry is introducing modified tobacco products claiming to reduce the risk of smoking (potential reduced exposure products, PREPs). If PREPs are perceived as safe, they may deter smokers from quitting and encourage re-initiation by smokers who have quit. OBJECTIVE To assess smokers' and ex-smokers' perceptions of PREPs and the impact of PREP claims on interest in quitti...

We present high-resolution ( ) UV-Visual Echelle Spectrograph spectra of the eclipsing pre–mainR ∼ 44,000 sequence star KH 15D covering the wavelength range 4780–6810 Å obtained at three phases: out of eclipse, near minimum light, and during egress. The system evidently acts as a natural coronagraph, enhancing the contrast relative to the continuum of hydrogen and forbidden emission lines durin...

For help in preparation of this article, thanks to Syed Ali, Chevron, Houston; and Jerome Maniere, Moscow. ECLIPSE 300, LFA (Live Fluid Analyzer for MDT tool), MDT (Modular Formation Dynamics Tester) and PVT Express are marks of Schlumberger. CHEARS is a mark of Chevron. Teflon is a mark of E.I. du Pont de Nemours and Company. How does a company optimize development of a gas-condensate field, when

We report new and archival K-band interferometric uniform disk diameters obtained with the Palomar Testbed Interferometer for the eclipsing binary star Aurigae, in advance of the start of its eclipse in 2009. The observations were intended to test whether low amplitude variations in the system are connected with the F supergiant star (primary), or with the intersystem material connecting the st...

We present low–medium resolution optical spectroscopy of the eclipsing AM Her system MN Hya (RX J0929–24). We determine the magnetic field strength at the primary accretion region of the white dwarf to be 42MG from the spacing of cyclotron features visible during φ ∼0.4–0.7. From spectra taken during the eclipse we find that the secondary has a M3–4 spectral type. Combined with the eclipse phot...

Abstract We describe the measurement of brightness temperature Moon from space during a total lunar eclipse by using microwave sounder aboard weather satellite. Previous observations eclipses were inconsistent and did not cover frequency range between 100 200 GHz. In this work, we seek to establish reliable relationship drop in for millimeter wavelengths. For purpose, chose on 2004 October 28, ...