The kinematics and space density of M dwarf stars

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Density (Mass/Volume), Dwarf Stars, Kinematics, Luminosity, M Stars, Spectrum Analysis

Scientific paper

An objective prism survey in the red spectral region was completed which covers approximately two percent of the sky at intermediate south galactic latitudes to a limiting magnitude of V-12 for early M stars and to V-14 for late M stars. More than five hundred late K stars and M stars were detected, of which the vast majority are dwarfs. Upper and lower limits for the luminosity function for early M stars are derived from photographically determined apparent magnitudes and absolute magnitudes obtained from objective prism spectral types. The solar motion is computed from the tangential velocities of the late M dwarfs. The kinematic properties of the late M dwarfs are compared with those determined in other investigations. Some problems associated with the use of objective prism surveys in the red spectral region for the accurate classification of late main-sequence stars are presented.

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