On the nature of the missing mass in the solar neighbourhood

Details On the nature of the missing mass in the solar neighbourhood On the nature of the missing mass in the solar neighbourhood

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.223..845h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 223, Dec. 15, 1986, p. 845-858.

Astronomy and Astrophysics

Astrophysics

34

Brown Dwarf Stars, Dwarf Stars, Missing Mass (Astrophysics), Solar Neighborhood, Stellar Luminosity, Color-Magnitude Diagram, Parallax, Stellar Evolution, Stellar Mass

Scientific paper

A survey for low-luminosity M-dwarfs from deep UK Schmidt plates is described. The stars were selected on the basis of (R-I) color using COSMOS measures of R and I band plates, and absolute magnitudes obtained from the color/luminosity relation for parallax stars. The resulting luminosity function shows a decrease in space density in the range M(R) = 12-15, in agreement with earlier surveys; thereafter the space density rises again. On the basis of stellar evolution models for low-mass stars, the turnover in the lumiunosity function is associated with the cessation of hydrogen burning, and its subsequent rise with the appearance of a population of degenerate brown dwarfs. These objects appear to have a small velocity dispersion suggesting they are young, as expected from the models. The implications of these observations for the problem of missing mass in the solar neighborhood are discussed. Although the numbers so far detected are insufficient to make up the deficit, there now seems good reason to believe that it may reside in yet fainter stars or substellar objects after all.

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