Astronomy:HD 155876

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Short description: Star in the constellation Hercules

Coordinates: Sky map 17h 12m 07.91s, +45° 39′ 57.2″

HD 155876
HD 155876 is located in the constellation Hercules
HD 155876 is located in the constellation Hercules
HD 155876

Location of HD 155876 in the constellation Hercules
Observation data
Equinox J2000.0]] (ICRS)
Constellation Hercules[1]
Right ascension  17h 12m 07.9117s[2]
Declination +45° 39′ 57.216″[2]
Apparent magnitude (V) 9.52[3]
Characteristics
A
Evolutionary stage main sequence[4]
Spectral type M3[4]
B
Evolutionary stage main sequence[4]
Spectral type M4[4]
Astrometry
Radial velocity (Rv)−30.9±0.5[5] km/s
Proper motion (μ) RA: +348.59±5.68[2] mas/yr
Dec.: −1624.84±6.80[2] mas/yr
Parallax (π)156.66 ± 1.37[6] mas
Distance20.8 ± 0.2 ly
(6.38 ± 0.06 pc)
Absolute magnitude (MV)+10.31[1]
Orbit[4]
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[lower-alpha 1]
Argument of periastron (ω)
(secondary)		99.0±1.0°
Details
A
Mass0.379±0.035[7] M☉
Radius0.37±0.07[8] R☉
Luminosity0.018[9] L☉
Temperature3,422±100[8] K
Metallicity [Fe/H]−0.31±0.17[10] dex
B
Mass0.369±0.035[7] M☉
Radius0.37±0.07[8] R☉
Temperature3,422±100[8] K
Metallicity [Fe/H]−0.31±0.17[10] dex
Other designations
BD+45°2505, GJ 661, HD 155876, HIP 84140, WDS J17121+4540, KUI 79,[11] Furuhjelm 46[12]
A: LFT 1326, LHS 433, LTT 15095, NLTT 44362
B: LFT 1327, LHS 434, LTT 15096, NLTT 44363
Database references
SIMBADThe system
A
B

HD 155876, also known as 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.[13] HD 155876 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.

Notes

  1. ↑ Fractional Besselian year

References

  1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 Van Leeuwen, Floor (2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. 
  3. ↑ Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (2012). "VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012)". Vizier Online Data Catalog. Bibcode: 2012yCat.1322....0Z. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 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, doi:10.1086/117790, Bibcode: 1996AJ....111..370H 
  5. ↑ Sperauskas, J.; Bartašiūtė, S.; Boyle, R. P.; Deveikis, V.; Raudeliūnas, S.; Upgren, A. R. (2016). "Radial velocities of K-M dwarfs and local stellar kinematics". Astronomy and Astrophysics 596: A116. doi:10.1051/0004-6361/201527850. Bibcode: 2016A&A...596A.116S. 
  6. ↑ Söderhjelm, Staffan (1999). "HIP 84140". Visual binary orbits and masses post Hipparcos. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=J/A+A/341/121&HIP=84140. 
  7. ↑ 7.0 7.1 Hillenbrand, Lynne A.; White, Russel J. (2004-04-01). "An Assessment of Dynamical Mass Constraints on Pre-Main-Sequence Evolutionary Tracks" (in en). The Astrophysical Journal 604 (2): 741. doi:10.1086/382021. ISSN 0004-637X. Bibcode: 2004ApJ...604..741H. 
  8. ↑ 8.0 8.1 8.2 8.3 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. doi:10.3847/0004-637X/822/2/97. Bibcode: 2016ApJ...822...97H. 
  9. ↑ Gaidos, E.; Mann, A. W.; Lépine, S.; Buccino, A.; James, D.; Ansdell, M.; Petrucci, R.; Mauas, P. et al. (2014). "Trumpeting M dwarfs with CONCH-SHELL: A catalogue of nearby cool host-stars for habitable exoplanets and life". Monthly Notices of the Royal Astronomical Society 443 (3): 2561. doi:10.1093/mnras/stu1313. Bibcode: 2014MNRAS.443.2561G. 
  10. ↑ 10.0 10.1 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". The Astrophysical Journal 748 (2): 93. doi:10.1088/0004-637X/748/2/93. Bibcode: 2012ApJ...748...93R. 
  11. ↑ "HD 155876". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+155876. 
  12. ↑ Lippincott, S. L. (November 1959). "Parallax and mass ratio of Furuhjelm 46.". Astronomical Journal 64: 419-422. doi:10.1086/107962. Bibcode: 1959AJ.....64..419L. 
  13. ↑ Kuiper, Gerard (1934). "Two New Close M-Dwarf Binaries of Large Parallax". Publications of the Astronomical Society of the Pacific 46 (373): 235. doi:10.1086/124479. Bibcode: 1934PASP...46..235K. 



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