We present astrometric monitoring data of the binary brown dwarf DENIS-P J1228.2-1547. The data have been obtained with the Hubble Space Telescope over a time span of 5.5 yr, and confirm that DENIS-P J1228.2-1547 is indeed a common proper motion, i.e., physical, binary. The data cover about 1/8th of the binary orbit, indicating an orbital period of
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Astrometric monitoring of the binary brown dwarf DENIS-P J1228.2-1547Brandner, W. et al.122004
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Astronomical site selection: on the use of satellite data for aerosol content monitoring
The main goal of this work is to analyse new approaches to the study of the properties of astronomical sites. In particular, satellite data measuring aerosols have recently been proposed as a useful technique for site characterization and searching for new sites to host future very large telescopes. Nevertheless, these data need to be critically
Varela, A. M. et al.Fecha de publicación:
122008 -
Atomic Hydrogen Gas Kinematics in NGC 3359
We present the kinematical analysis of HI and HII gases within the disk of NGC 3359. There is a strong trend of non-circular gas flow as seen in the velocity field maps of both media. Specifically, the regions near the bar are marked by very skewed isovelocity contour lines. Within the area, velocity differences between the neutral atomic and
Boonyasait, V. et al.Fecha de publicación:
122000 -
Aurorae Observed at the Canary Islands
Descriptions of eleven aurorae observed in the Canary Islands during the period 1770 - 2010 have been found in different documents. Most of them are coincident with periods of strong solar activity, with the geomagnetic latitude playing a minor role. Coronal mass ejections are the most probable solar source of these low-latitude events. The absence
Vázquez, M. et al.Fecha de publicación:
122010 -
Auroral and Non-auroral X-ray Emissions from Jupiter: A Comparative View
Jovian X-rays can be broadly classified into two categories: (1) "auroral" emission, which is confined to high-latitudes ( ˜>60° ) at both polar regions, and (2) "dayglow" emission, which originates from the sunlit low-latitude ( ˜
Bhardwaj, A. et al.Fecha de publicación:
122004 -
Background solar irradiance spectrum at high and low phases of the solar activity cycle
Two data series of disk integrated solar irradiance, taken by the Variability of the solar IRradiance and Gravity Oscillations (VIRGO) experiment on board the Solar and Heliospheric Observatory (SoHO) mission, corresponding to epochs of minimum and maximum solar activity have been analysed in order to study the background signal of the associated
Vázquez Ramió, H. et al.Fecha de publicación:
122002