منابع مشابه
The Gaia mission Pulsating stars with Gaia
Gaia is a cornerstone mission of the European Space Agency (ESA) selected in 2000, with a target launch date of 2011. The Gaia mission will perform a survey of about 1 billion sources brighter than V = 20. Its goal is to provide astrometry leading to parallaxes, proper-motions and positions. Astrometric data are complemented by multicolour photometry and a spectroscopic instrument (up to V = 17...
متن کاملSimulating multiple stars in preparation for Gaia
The scientific preparation of the Gaia mission encompasses both the data reduction algorithms and the generation of simulated data which have to be as realistic as possible. In this respect, binaries and multiple stars are a mandatory component in the simulation of the Milky Way as they impact on the performance tests of the on-ground data processing. The ingredients for the simulation of multi...
متن کاملGaia and the Evolution of Young Stars
I summarize some of the main problems concerning the evolution of low mass (M < 1:5M) stars from the formation to the main sequence phase and point out the unique potentiality of GAIA in shedding light on the hidden parameters which govern these phases of stellar evolution. GAIA will also be able to monitor the evolution of young massive brown dwarfs in the phase of deuterium burning. 1 Questio...
متن کاملKuiper belts around nearby stars*
Context. The existence of dusty debris disks around a large fraction of solar type main-sequence stars, inferred from excess far-IR and submillimetre emission compared to that expected from stellar photospheres, suggests that leftover planetesimal belts analogous to the asteroidand comet reservoirs of the solar system are common. Aims. Sensitive submillimetre observations are essential to detec...
متن کاملKinematics of Nearby Subdwarf Stars
We present an analysis of the space motions of 742 subdwarf stars based on the sample of Carney et al.(1994). Hipparcos parallaxes, TYC2+HIP proper motions and Tycho2 proper motions were combined with radial velocities and metallicities from CLLA. The kinematical behavior is discussed in particular in relation to their metallicities. The majority of these sample stars have metal abundances of [...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2018
ISSN: 1538-4357
DOI: 10.3847/1538-4357/aae83e