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Discovery of the Widest Very Low Mass Binary
We report the discovery of a very low mass binary system (primary mass<0.1 Msolar) with a projected separation of ~5100 AU, morethan twice that of the widest previously known system. A spectrumcovering the 1-2.5 μm wavelength interval at R~1700 is presented foreach component. Analysis of the spectra indicates spectral types of M6.5V and M8 V, and the photometric distance of the system is ~62 pc. Giventhat previous studies have established that no more than 1% of very lowmass binary systems have orbits larger than 20 AU, the existence of sucha wide system has a bearing on very low mass star formation andevolution models.
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Observation and Astrometry data
| Constellation: | Φοίνιξ |
| Right ascension: | 01h21m44.33s |
| Declination: | -52°04'35.4" |
| Apparent magnitude: | 8.601 |
| Distance: | 271.003 parsecs |
| Proper motion RA: | 19.2 |
| Proper motion Dec: | 7.1 |
| B-T magnitude: | 8.755 |
| V-T magnitude: | 8.614 |
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