The brown dwarf candidate ESO 207-61: Its distance and very low luminosity

Details The brown dwarf candidate ESO 207-61: Its distance and very low luminosity The brown dwarf candidate ESO 207-61: Its distance and very low luminosity

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...441l..47i&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 441, no. 1, p. L47-L50

Other

5

Astrometry, Astronomical Photometry, Astronomical Spectroscopy, Brown Dwarf Stars, Distance, M Stars, Stellar Luminosity, Stellar Models, Charge Coupled Devices, Chemical Composition, Stellar Parallax

Scientific paper

The relative trigonometric parallax we have measured for ESO 207-61 confirms its predicted very low luminosity. From southern CCD observations we find pirel = 0.0504 sec +/- 0.0026 sec giving absolute magnitudes of MV = 19.50 +/- 0.15, MK = 10.72 +/- 0.12, and Mbol = 13.88 +/- 0.27. It is one of the faintest objects found to date and has a spectral type of M9 on the Boeschaar system. Its evolutionary status is discussed, and we compare it with other objects near the stellar/substellar boundary; owing to the difficult problem of effective temperature calibration for such cool objects comparisons with stellar models are of limited value.

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