The influence of binary stars on the kinematics of low-mass galaxies

Details The influence of binary stars on the kinematics of low-mass galaxies The influence of binary stars on the kinematics of low-mass galaxies

2002-01-24

arxiv.org/abs/astro-ph/0201404v1

Mon.Not.Roy.Astron.Soc. 329 (2002) 829

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1046/j.1365-8711.2002.05075.x

In this paper, the influence of binary stars on the measured kinematics of dwarf galaxies is investigated. Using realistic distributions of the orbital parameters (semi-major axis, eccentricity, ...), analytical expressions are derived for the changes induced by the presence of binary stars in the measured velocity moments of low-mass galaxies (such as the projected velocity dispersion and the 4th order Gauss-Hermite coefficient h4). It is shown that there is a noticeable change in the observed velocity dispersion if the intrinsic velocity dispersion of a galaxy is of the same order as the binary velocity dispersion. The kurtosis of the line-of-sight velocity distribution (LOSVD) is affected even at higher values of the intrinsic velocity dispersion.

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