Furuhjelm 46

Last updated
Furuhjelm 46
Observation data
Epoch J2000       Equinox J2000
Constellation Hercules
Right ascension 17h 12m 07.9117s [1]
Declination +45° 39′ 57.216″ [1]
Apparent magnitude  (V)10.02/10.25
Characteristics
Spectral type M3 + M3.5
Astrometry
Radial velocity (Rv)–19 ± 5 km/s
Proper motion (μ)RA: +348.59±5.68 mas/yr [1]
Dec.: −1624.84±6.80 mas/yr [1]
Parallax (π)156.66±1.37  mas [2]
Distance 20.8 ± 0.2  ly
(6.38 ± 0.06  pc)
Orbit [3]
Period (P)12.9512 ± 0.0096 yr
Semi-major axis (a)0.7620 ± 0.0015″
Eccentricity (e)0.7430 ± 0.008
Inclination (i)149.14 ± 0.25°
Longitude of the node (Ω)160.0 ± 1.3°
Periastron epoch (T)1991.032 ± 0.011 [4]
Argument of periastron (ω)
(secondary)		99.0 ± 1.0°
Details
A
Mass 0.379±0.035 [5]   M☉
Radius 0.37±0.07 [6]   R☉
Temperature 3,422±100 [6]   K
Metallicity [Fe/H]–0.31 ± 0.17 [7]   dex
B
Mass 0.369±0.035 [5]   M☉
Radius 0.37±0.07 [6]   R☉
Temperature 3,422±100 [6]   K
Metallicity [Fe/H]–0.31 ± 0.17 [7]   dex
Other designations
BD+45° 2505, HD 155876, HIP  84140, WDS 17121+5450, KUI 79
Gl 661 A: LFT 1326, LTT 15095, LHS 433, NLTT 44362
Gl 661 B: LFT 1327, LTT 15096, LHS 434, NLTT 44363
Database references
SIMBAD The system
A
B
Hercules constellation map.svg
Red pog.png
Furuhjelm 46
Location of Furuhjelm 46 in the constellation Hercules

Furuhjelm 46, also known as HD 155876 and Gliese 661, is a nearby binary star system, consisting of two very similar red dwarfs, located in the constellation Hercules.

The star's duplicity was discovered by the Dutch astronomer Gerard Kuiper in 1934 in a systematic survey for duplicity of the known stars within about 25 parsecs from the Sun, carried out with the 36-inch telescope of the Lick Observatory. [8] Furuhjelm 46 is the nearest "true" (i. e. not brown dwarf) star system in Hercules, however, there is brown dwarf in this constellation, located closer: WISE 1741+2553.

References

  1. 1 2 3 4 van Leeuwen, Floor (13 August 2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics. 474 (2): 653–664. arXiv: 0708.1752 . Bibcode:2007A&A...474..653V. doi: 10.1051/0004-6361:20078357 . eISSN   1432-0746. ISSN   0004-6361.
  2. ↑ Söderhjelm, Staffan (1999). "HIP 84140". Visual binary orbits and masses post Hipparcos.
  3. ↑ From the Sixth Catalog of Orbits of Visual Binary Stars, based upon Hartkopf, W. I.; Mason, B. D.; McAlister, H. A. (1996), "Binary star orbits from speckle interferometry. VIII. Orbits of 37 close visual systems", Astronomical Journal, 111: 370–392, Bibcode:1996AJ....111..370H, doi: 10.1086/117790
  4. ↑ Fractional Besselian year.
  5. 1 2 Hillenbrand, Lynne A.; White, Russel J. (2004-04-01). "An Assessment of Dynamical Mass Constraints on Pre-Main-Sequence Evolutionary Tracks". The Astrophysical Journal. 604 (2): 741. arXiv: astro-ph/0312189 . Bibcode:2004ApJ...604..741H. doi:10.1086/382021. ISSN   0004-637X.
  6. 1 2 3 4 Houdebine, E. R.; Mullan, D. J.; Paletou, F.; Gebran, M.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2016). "Rotation-Activity Correlations in K and M Dwarfs. I. Stellar Parameters and Compilations of v sin I and P/Sin I for a Large Sample of Late-K and M Dwarfs". The Astrophysical Journal. 822 (2): 97. arXiv: 1604.07920 . Bibcode:2016ApJ...822...97H. doi: 10.3847/0004-637X/822/2/97 . S2CID   119118088.
  7. 1 2 Rojas-Ayala, Bárbara; et al. (April 2012). "Metallicity and Temperature Indicators in M Dwarf K-band Spectra: Testing New and Updated Calibrations with Observations of 133 Solar Neighborhood M Dwarfs" (PDF). The Astrophysical Journal. 748 (2): 93. arXiv: 1112.4567 . Bibcode:2012ApJ...748...93R. doi:10.1088/0004-637X/748/2/93. S2CID   41902340.
  8. ↑ Kuiper, Gerard (1934). "Two New Close M-Dwarf Binaries of Large Parallax". Publications of the Astronomical Society of the Pacific. 46 (373): 235. Bibcode:1934PASP...46..235K. doi: 10.1086/124479 . S2CID   119814250.
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