منابع مشابه
ASTRONOMY AND ASTROPHYSICS Time - resolved HST and IUE UV spectroscopy of the Intermediate Polar FO Aqr ⋆
Time resolved spectroscopy of the Intermediate Polar FO Aqr reveals the presence of multiple peri-odicities in the UV range. A strong orbital modulation dominates both continuum and emission line flux vari-abilities, while line velocity motions are only detected at the rotational frequency. A prominent orbital periodicity is also observed in coordinated optical photometry, where FO Aqr was prev...
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deployable scissor type structures are composed of the so-called scissor-like elements (sles), which are connected to each other at an intermediate point through a pivotal connection and allow them to be folded into a compact bundle for storage or transport. several sles are connected to each other in order to form units with regular polygonal plan views. the sides and radii of the polygons are...
Highlights from Hst/nicmos
The Near-Infrared Camera and Multi-Object Spectrometer (NICMOS) was installed in the Hubble Space Telescope in February 1997. After twenty-two months of operation the 110 kg supply of solid N2, which cooled the NICMOS-3 HgCdTe detectors, was exhausted. The cryostat warmed up leaving the instrument in an electromechanically functional, but scientifically non-viable, passive state. Following a th...
متن کاملA Three-Level Mathematical Model for an r-interdiction Hierarchical Facilities Location Problem
In general, any system may be at risk in a case of losing the critical facilities by natural disasters or terrorist attacks. This paper focuses on identifying the critical facilities and planning to reduce the effect of this event. A three-level model is suggested in the form of a defender-attacker-defender. It is assumed that the facilities are hierarchical and capable of nesting. Also, the at...
متن کاملNear and Mid-ir Sub-arcsecond Structure of the Dusty Symbiotic Star R Aqr
The results of a high-resolution interferometric campaign targeting the symbiotic long-period variable (LPV) R Aqr are reported. With both near-infrared measurements on baselines out to 10 m and mid-infrared data extending to 32 m, we have been able to measure the characteristic sizes of regions from the photosphere of the LPV and its extended molecular atmosphere, out to the cooler circumstell...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1992
ISSN: 0074-1809
DOI: 10.1017/s0074180900122636