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Pulkovo compilation of radial velocities for 35495 stars in a common system.
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| 2MASS J22521073-1730134: A Resolved L/T Binary at 14 Parsecs
NICMOS images of the nearby late-type L dwarf 2MASS J22521073-1730134(DENIS-P J225210.73-173013.4) show that it is a close double, separation0.13". The companion is 1.0 mag fainter than the primary in the F110Wpassband and 1.55 mag fainter in the F170M images. The latter passbandis centered on the 1.6 μm methane band. The small separation and theabsence of an optical counterpart suggest that the two sources areassociated; the relatively blue infrared color suggests that 2MASSJ22521073-1730134B is a T-type binary companion of the late-L primary.This hypothesis is supported by infrared spectroscopy, which shows weakmethane absorption in both the H and K passbands. We estimate a distanceof 13.6+3.8-2.6 pc to the system and a projectedlinear separation of 1.75 AU. We consider the potential for measuringdynamical masses of the two components.Based on observations made with the NASA/ESA Hubble Space Telescope,obtained from the Space Telescope Science Institute, which is operatedby the Association of Universities for Research in Astronomy, Inc.,under NASA contract NAS 5-26555.
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Osservazione e dati astrometrici
| Costellazione: | Acquario |
| Ascensione retta: | 23h39m41.57s |
| Declinazione: | -22°32'00.2" |
| Magnitudine apparente: | 7.287 |
| Distanza: | 223.714 parsec |
| Moto proprio RA: | 29.1 |
| Moto proprio Dec: | -26.8 |
| B-T magnitude: | 7.427 |
| V-T magnitude: | 7.299 |
Cataloghi e designazioni:
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