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Scr 1845-6357

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Title: Scr 1845-6357  
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Scr 1845-6357

SCR 1845-6357, right bottom
Three-colour image of SCR1845-6357AB generated from the SDI filter images (blue=1.575 micrometre, green=1.600 micrometre, red=1.625 micrometre). Because the T-dwarf fades away towards the longer wavelengths, it appears quite blue in this image. It is roughly 50 times fainter than the star and is separated from it by an angle of 1.17 arcsecond on the sky (4.5 times the Earth-Sun distance).

SCR 1845-6357 is a binary system, about 12.6 light-years away in the constellation Pavo. The primary is a faint red dwarf. It has a brown dwarf companion.

SCR 1845-6357 A

SCR 1845-6357A
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pavo
Right ascension 18h 45m 05.26s[1]
Declination −63° 57′ 47.8″[1]
Apparent magnitude (V) 17.4[2]
Characteristics
Spectral type M8.5[3]
Astrometry
Proper motion (μ) RA: 2444[2] mas/yr
Dec.: 696[2] mas/yr
Parallax (π) 259.45 ± 1.11[1] mas
Distance 12.57 ± 0.05 ly
(3.85 ± 0.02 pc)
Details
Mass 0.07 [4] M
Radius 0.096 R
Luminosity 0.0004 L
Temperature 2600–2700[3] K
Other designations
DENIS-P J184504.9-635747, 2MASS J18450541-6357475, SCR J1845-6357,[2] SCR 1845A[3]

The primary, SCR 1845-6357A, is a faint (apparent magnitude 17.4)[2] red dwarf star with a mass of about 7% of the Sun's. However, the measurements are still preliminary and are subject to change.[4]

SCR 1845-6357 B

SCR 1845-6357B
Position (relative to A)
Epoch of observation J2006.3
Angular distance 1.064 ± 0.004 [3]
Position angle 177.2 ± 0.06° [3]
Observed separation
(projected)
4.10 ± 0.04 AU [5]
Characteristics
Spectral type T6 [3]
Apparent magnitude (J) 13.26[6]
Details
Mass 0.04 to 0.05 [3] M
Surface gravity (log g) 5.1 [3] cgs
Temperature 950 [3] K
Age 1.8·109 to 3.1·109 [3] years
Other designations
SCR J1845-6357B,[7] SCR 1845B[3]

This star has been found to possess a brown dwarf companion, designated SCR 1845-6357B. The companion, classified as a T-dwarf, has an observed projected distance of 4.1 AU, an estimated mass between 40 and 50 times the mass of Jupiter, and an estimated effective temperature of 950 K.[3][5] The brown dwarf has a near-IR J band magnitude of 13.26.[6]

Distance

SCR 1845-6357 distance estimates
Source Parallax, mas Distance, pc Distance, ly Ref.
Deacon et al. (2005) 282 ± 23 3.55+0.31
−0.27
11.6+1
−0.9
[8]
Henry et al. (2006) 259.45 ± 1.11 3.854+0.017
−0.016
12.57 ± 0.05 [1][9]
RECONS TOP100 (2012) 259.50 ± 1.11[note 1] 3.854+0.017
−0.016
12.57 ± 0.05 [10]

Non-trigonometric distance estimates are marked in italic. The best estimate is marked in bold.

References

  1. ^ a b c d Henry, T. J.; Jao, Wei-Chun; Subasavage, John P.; Beaulieu, Thomas D.; Ianna, Philip A.; Costa, Edgardo; Méndez, René A. (2006). "The Solar Neighborhood. XVII. Parallax Results from the CTIOPI 0.9 m Program: 20 New Members of the RECONS 10 Parsec Sample".  
  2. ^ a b c d e DENIS-P J184504.9-635747, entry, SIMBAD. Accessed on line June 17, 2008.
  3. ^ a b c d e f g h i j k l The very nearby M/T dwarf binary SCR 1845-6357, Markus Kasper, Beth A. Biller, Adam Burrows, Wolfgang Brandner, Jano Budaj, and Laird M. Close, Astronomy and Astrophysics 471, #2 (August 2007), pp.655–659. Bibcode: 2007A&A...471..655K. doi:10.1051/0004-6361:20077881.
  4. ^ a b  
  5. ^ a b Observed projected distance computed from parallax and observed angular distance.
  6. ^ a b Chris Gelino,   (main page)
  7. ^ SCR J1845-6357B, entry, SIMBAD. Accessed on line June 17, 2008.
  8. ^ Deacon, Niall R.; Hambly, Nigel C.; Henry, Todd J.; Subasavage, John P.; Brown, Misty A.; Jao, Wei-Chun (2005). "The Solar Neighborhood. XI. The Trigonometric Parallax of SCR 1845-6357".  
  9. ^ Faherty, Jacqueline K.; Burgasser, Adam J.; Walter, Frederick M.; Van der Bliek, Nicole; Shara, Michael M.; Cruz, Kelle L.; West, Andrew A.; Vrba, Frederick J.; Anglada-Escud, Guillem (2012). "The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs".  
  10. ^ "RECONS TOP100". THE ONE HUNDRED NEAREST STAR SYSTEMS brought to you by RECONS (Research Consortium On Nearby Stars). 2012. Retrieved 2014-10-22. 
  • Hambly, Nigel C.; Henry, Todd J.; Subasavage, John P.; Brown, Misty A.; Jao, Wei-Chun (2004). "The Solar Neighborhood. VIII. Discovery of New High Proper Motion Nearby Stars Using the SuperCOSMOS Sky Survey".  
  • B.A. Biller et al., 2006, "Discovery of a Brown Dwarf Very Close to the Sun: A Methane-rich Brown Dwarf Companion to the Low-Mass Star SCR 1845-6357", Astrophysical Journal Letters.

Notes

  1. ^ Weighted parallax based on parallaxes from Deacon et al. (2005) and Henry et al. (2006).

External links

  • New Objects within 20 light-years at SolStation.
  • SCR 1845-6357

See also

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