2MASSW J0856479 + 223518

Database links to 2MASSW J0856479 + 223518

2MASSW J0856479 + 223518
Observation dates equinox : J2000.0 , epoch : J2000.0
Constellation	cancer
Right ascension	08 ^h 56 ^m 47.9 ^s
declination	2223518+ 22 ° 35 ′ 18 ″
Brightness (J-band)	15.7 mag
Spectral class	approx L3 L5? + L8?
Astrometry
distance	about 30 to 40 pc
Catalog entries
2MASS J08564793 + 2235182 2MASSI J0856479 + 223518

2MASSW J0856479 + 223518 is a possible close double system of two ultra-cool dwarfs in the constellation Cancer .

The object was identified as an ultra-cool L-dwarf by analyzing data from the Two Micron All Sky Survey . A study published in 2003 with the help of the Hubble space telescope revealed indications that it is a close double system with an angular distance of about a tenth of an arc second and a relatively large difference in brightness. This constellation makes it very difficult to confirm this and to obtain reliable information about the alleged system.

The unresolved object was assigned to spectral class L3; if it is a double system, then the components could roughly belong to the spectral classes L5 and L8. Photometric distance estimates for the object give a distance on the order of 30 to 40 parsecs .

literature

Peter R. Allen et al .: A New Brown Dwarf Desert? A Scarcity of Wide Ultracool Binaries. In: The Astronomical Journal Vol. 133 No. 3 (2007), doi : 10.1086 / 510346 , online
Kelle L. Cruz et al .: Meeting the Cool Neighbors. V. A 2MASS-Selected Sample of Ultracool Dwarfs In: The Astronomical Journal. Vol. 126 No. 5 (2003), doi : 10.1086 / 378607 , online

Individual evidence

↑ ^a ^b Simbad
^ Peter R. Allen et al .: A New Brown Dwarf Desert? A Scarcity of Wide Ultracool Binaries. In: The Astronomical Journal Vol. 133 No. 3 (2007), p. 975
↑ Nick Siegler et al .: Discovery of two very low mass binaries: final results of an adaptive optics survey of nearby M6.0 – M7.5 Stars . In: The Astrophysical Journal . Vol. 621, pp. 1023-1032 (2005), online (PDF; 741 kB), here: p. 1030.

[SIMBAD-1] Simbad

[Allen-2] Peter R. Allen et al .: A New Brown Dwarf Desert? A Scarcity of Wide Ultracool Binaries. In: The Astronomical Journal Vol. 133 No. 3 (2007), p. 975

[3] Nick Siegler et al .: Discovery of two very low mass binaries: final results of an adaptive optics survey of nearby M6.0 – M7.5 Stars . In: The Astrophysical Journal . Vol. 621, pp. 1023-1032 (2005), online (PDF; 741 kB), here: p. 1030.