Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.234..533h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 234, Oct. 1, 1988, p. 533-537.
Astronomy and Astrophysics
Astronomy
4
Early Stars, M Stars, Milky Way Galaxy, Stellar Luminosity, Stellar Mass, Astronomical Photometry, Brown Dwarf Stars, Stellar Magnitude, Stellar Motions, Velocity Distribution
Scientific paper
Samples of M stars have been obtained in the direction of the SGP and at galactic latitude b = -47° from R and I band UK Schmidt plates. The absolute magnitudes MR were obtained from (R-I) colour, and the space density evaluated as a function of height above the galactic plane, for a range of luminosities MR = 9 - 14. This was then used to obtain the relation between scale height and absolute magnitude. Combining the data with previously published results for more massive stars shows a steady decline in the scale height from a maximum around 300 pc for early M stars down to 80 pc for the least luminous stars in the sample. This result is interpreted as implying a small age of 5×108yr for these low luminosity stars. If these stars are indeed young, it is argued that they are probably "brown dwarfs" which have failed to ignite hydrogen and are cooling rapidly to very low luminosities.
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