Expected number of new variable stars by TYCHO photometry with HIPPARCOS

Details Expected number of new variable stars by TYCHO photometry with HIPPARCOS Expected number of new variable stars by TYCHO photometry with HIPPARCOS

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...185..349m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 185, no. 1-2, Oct. 1987, p. 349-353.

Astronomy and Astrophysics

Astronomy

4

Hipparcos Satellite, Spaceborne Astronomy, Star Distribution, Stellar Spectrophotometry, Variable Stars

Scientific paper

Empirical detection probabilities and statistics of known variable stars lead to the conclusion, that several thousand new variables may be found in the Tycho photometric survey with Hipparcos. It appears that the number of variables brighter than B = 11 mag will be at least doubled for most types of variability. For most types of variability, the survey should give a fairly complete sample to a given magnitude and being uniform over the whole sky. The expected completeness and uniformity is a great improvement compared to the present unsatisfactory situation. It is found that sinusoidal components of variation will be detectable with the same amplitude sensitivity for all periods in the interval from 1 second to 2.5 years. At e.g. the magnitudes B = 8, 9, and 10, full amplitudes of 0.05, 0.10, and 0.20 mag, respectively, will be detectable with 50 percent efficiency and 99 percent confidence. Full amplitudes of 0.06, 0.12, and 0.25 mag will be found with the same 50 percent efficiency but at 99.99 percent confidence or, alternatively, if the signal acceptance threshold is raised, with 85 percent efficiency at a 99 percent confidence level. Hence, for stars of a given magnitude the change from a hardly detectable to a very reliably detected variation takes place within only 30 percent increase of the amplitude.

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