We explain the linear polarization of the Ca ii infrared triplet observed close to the edge of the solar disk. In particular, we demonstrate that the physical...
Zero-metallicity Hypernova Uncovered by an Ultra-metal-poor Star in the Sculptor Dwarf Spheroidal Galaxy
Although true metal-free "Population III" stars have so far escaped discovery, their nature, and that of their supernovae, is revealed in the chemical products...
The formation time scales of quiescent galaxies can be estimated in two different ways: by their star formation history and by their chemistry. Previously, the...
Zodiacal light photopolarimetry. I - Observations, reductions, disturbing phenomena, accuracy. II - Gradients along the ecliptic and the phase functions of interplanetary matter
Zodiacal light photopolarimetry. III - All-sky survey from Teide 1964-1975 with emphasis on off-ecliptic features
Photopolarimetric observations of the zodiacal light over a complete solar cycle are used to study the average distribution of brightness and degree of...
ZW 0855+06: A Wolf-Rayet Dwarf Galaxy Triggered by a Dwarf-Dwarf Interaction
We present narrowband (Hα and adjacent continuum) and broadband (B and V) optical images of the dwarf Wolf-Rayet galaxy Zw 0855+06 and its companion, together...