Low-level stellar variability

Details Low-level stellar variability Low-level stellar variability

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aspc...40..693g&link_type=abstract

In: Inside the stars; Proceedings of the 137th IAU Colloquium, Univ. of Vienna, Austria, Apr. 13-18, 1992 (A93-53126 23-90), p.

Astronomy and Astrophysics

Astronomy

18

Hipparcos Satellite, Spaceborne Astronomy, Variable Stars, Hertzsprung-Russell Diagram, Light Curve, Stellar Atmospheres, Stellar Luminosity, Stellar Magnitude, Stellar Spectrophotometry, Stellar Temperature

Scientific paper

The capability of ground-based photometry to detect and monitor low-level stellar variations is discussed in the particular case of amplitudes in the range of few magnitudes to few percent. The technical and atmospherical constraints are briefly recalled. The variability level of the so-called constant stars is discussed as function of the spectral type, the luminosity class and the effective temperature. The photometric aspects of the Hipparcos mission are presented here since this satellite allows a systematic detection of microvariables and the obtention of light curves across this whole HR-diagram with an unprecedented efficiency.

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