Sökning: "Am star"
Hittade 2 avhandlingar innehållade orden Am star.
1. Investigations of Heavy Elements in Am and HgMn stars
Sammanfattning : The relationship between the HgMn and Am classes of chemically peculiar stars has been investigated primarily by observing abundances of heavy elements, including Pr, Nd, Hg, Tl and Bi. The main objective of the investigation has been to gather observational evidence to provide a better understanding of the mechanisms producing the abundance anomalies of these stars, and to establish the relationship between the two classes. LÄS MER
2. Tycho-Gaia and beyond: Combining data for precision astrometry
Sammanfattning : Astrometry aims at producing a three-dimensional map of positions and motions of stars and other celestial bodies in a consistent coordinate system covering the whole sky. This is best done from space, which provides a way of scanning the entire sky by a single instrument in a thermally stable environment. LÄS MER