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SCR 1845−6357 is a binary system, about 13 light-years away in the constellation Pavo. The primary is a faint red dwarf. It has a brown dwarf companion. The primary red dwarf was discovered in 2004 by Hambly et al., while the secondary brown dwarf was later discovered in 2006.

SCR 1845−6357A

Three-colour image of SCR1845−6357AB generated from the SDI filter images (blue=1.575 μm, green=1.600 μm, red=1.625 μm). 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″ on the sky (4.5 times the Earth-Sun distance).
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)249.6651 ± 0.1330 mas[4]
Distance13.064 ± 0.007 ly
(4.005 ± 0.002 pc)
Details
Mass0.07[5] M☉
Radius0.096 R☉
Luminosity0.0004 L☉
Temperature2600–2700[3] K
Other designations
DENIS-P J184504.9-635747, 2MASS J18450541-6357475, SCR J1845-6357,[2] SCR 1845A,[3] Gaia DR2 6439125097425259776
Database references
SIMBADThe system
A
SCR 1845−6357
Location of SCR 1845−6357 in the constellation Pavo

System


Artist's impression of the SCR 1845-6357 stellar system
Artist's impression of the SCR 1845-6357 stellar system

The primary, SCR 1845−6357A, is a faint (apparent magnitude 17.4)[2] ultra-cool red dwarf with a mass of about 7% of the Sun's. However, the measurements are still preliminary and are subject to change.[5]

SCR 1845-6357B
Position (relative to A)
Epoch of observationJ2006.3
Angular distance1.064 ± 0.004″ [3]
Position angle177.2 ± 0.06° [3]
Observed separation
(projected)		4.10 ± 0.04 AU [6]
Characteristics
Spectral type T6[3]
Apparent magnitude (J) 13.26[7]
Details
Mass0.04 to 0.05[3] M☉
Surface gravity (log g)5.1[3] cgs
Temperature950[3] K
Age1.8×109 to 3.1×109[3] years
Other designations
SCR J1845−6357B,[8] SCR 1845B[3]
Database references
SIMBADB
SCR 1845-6357, right bottom
SCR 1845-6357, right bottom

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][6] The brown dwarf has a near-IR J-band magnitude of 13.26.[7]


See also



References


  1. 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" (PDF). The Astronomical Journal. 132 (6): 2360–2371. arXiv:astro-ph/0608230. Bibcode:2006AJ....132.2360H. doi:10.1086/508233. S2CID 15002841.
  2. "DENIS-P J184504.9-635747". SIMBAD. Centre de données astronomiques de Strasbourg.
  3. 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. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  5. "THE ONE HUNDRED NEAREST STAR SYSTEMS". Research Consortium On Nearby Stars. Georgia State University. January 1, 2008. Retrieved June 17, 2008.
  6. Observed projected distance computed from parallax and observed angular distance.
  7. Chris Gelino; Davy Kirkpatrick; Adam Burgasser. "DwarfArchives.org: Photometry, spectroscopy, and astrometry of M, L, and T dwarfs". caltech.edu. Retrieved 2012-06-10. (main page)
  8. SCR J1845−6357B, entry, SIMBAD. Accessed on line June 17, 2008.



На других языках

[de] SCR 1845-6357

SCR 1845-6357 ist ein Sternsystem im Sternbild Pfau, bestehend aus einem Roten Zwerg mit einem substellaren Begleiter, bei dem es sich wahrscheinlich um einen Braunen Zwerg der Spektralklasse T6 handelt. Mit einer Entfernung von 13 Lichtjahren gehört dieses System zu den sonnennächsten Systemen.
- [en] SCR 1845−6357

[es] SCR 1845-6357

SCR 1845-6357 (2MASS J18450541-6357475) es una estrella a 12,75 años luz de distancia de la Tierra en la constelación de Pavo. Es una estrella de brillo muy débil con magnitud aparente +17,39.[1]

[ru] SCR 1845-6357

SCR 1845-6357 — двойная система в южном созвездии Павлина. Одна из ближайших к Солнцу — находится на расстоянии в 12,6 светового года. Это — 24-я ближайшая к Солнцу звёздная система[5].


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