Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.234..177h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 234, Sept. 1, 1988, p. 177-191.
Astronomy and Astrophysics
Astronomy
98
Late Stars, M Stars, Red Dwarf Stars, Stellar Luminosity, Astronomical Photometry, Brown Dwarf Stars, Charge Coupled Devices, Color-Magnitude Diagram, Main Sequence Stars, Schmidt Cameras, Stellar Evolution
Scientific paper
This paper describes a photometric survey for late M-dwarfs from COSMOS measures of R- and I-band UK Schmidt plates. The survey covers some 85 square degrees and includes about 500 M-stars within 100 pc. The luminosity function is sampled down to MR ≈ 17. In addition, spectra have been obtained for the six reddest stars, which have confirmed the low temperatures deduced from the photometry. Proper motions for two-thirds of the sample stars have been measured and indicate that the reddest stars are younger than the sample as a whole. The observed luminosity function has been compared with theoretical functions from the literature. There are some puzzling discrepancies for the more luminous stars, but there is unambiguous evidence for a steadily rising mass function towards the sample limit and the observations suggest that the local missing mass is in the form of low luminosity stars. The evolutionary status of the low luminosity stars in the sample is examined in the light of two hypotheses.
Bessell Michael S.
Hawkins R. S. M.
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