Coble defined in his 1929 treatise invariants for cubic surfaces and quartic curves. We reinterpret these in terms of the root systems of type E_6 and E_7 that...
Demonstration of Chromospheric Magnetic Mapping with CLASP2.1
Probing the magnetic nature of the Sun's chromosphere requires measurement of the polarization profiles of relevant magnetically sensitive spectral lines, many...
This is the first version of a complete near-IR point source catalogue towards the Magellanic Clouds extracted from the data obtained with the DEep Near...
DENIS: A Deep Near-Infrared Survey of the southern sky
The Deep Near-Infrared Survey (DENIS) project is the first attempt to carry out a complete digitized survey of the southern sky in the range 1-2.5 micrometers...
Density Bounded H II Regions: Ionization of the Diffuse Interstellar and Intergalactic Media
We present a study of the diffuse ionized gas (DIG) for a sample of nearby spiral galaxies using Hα images, after constructing their H II region catalogues. The...
Density Bounding in the H II Regions of Galactic Disks: Evidence and Consequences
We present four lines of evidence leading to the conclusion that a notable fraction of the ionizing photon emission from the stars within H II regions in the...
Density bounding in the HII regions of galactic discs: evidence and consequences
We present four lines of evidence leading to the conclusion that the HII regions in the discs of normal galaxies,notably the highly luminous regions,are density...