HD 155876
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 mas/yr[2] Dec.: −1624.84±6.80 mas/yr[2] |
| Parallax (π) | 156.66±1.37 mas[6] |
| Distance | 20.8 ± 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[a] |
| Argument of periastron (ω) (secondary) | 99.0±1.0° |
| Details | |
| A | |
| Mass | 0.379±0.035[7] M☉ |
| Radius | 0.37±0.07[8] R☉ |
| Luminosity | 0.018[9] L☉ |
| Temperature | 3,422±100[8] K |
| Metallicity [Fe/H] | −0.31±0.17[10] dex |
| B | |
| Mass | 0.369±0.035[7] M☉ |
| Radius | 0.37±0.07[8] R☉ |
| Temperature | 3,422±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 | |
| SIMBAD | The 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 a brown dwarf in this constellation located closer, WISE 1741+2553.
Notes
- ^ Fractional Besselian year
References
- ^ a b Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
- ^ a b c 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.
- ^ 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.
- ^ a b c d e 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
- ^ 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. Bibcode:2016A&A...596A.116S. doi:10.1051/0004-6361/201527850.
- ^ Söderhjelm, Staffan (1999). "HIP 84140". Visual binary orbits and masses post Hipparcos.
- ^ a b 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.
- ^ a b c d 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.
- ^ Gaidos, E.; Mann, A. W.; Lépine, S.; Buccino, A.; James, D.; Ansdell, M.; Petrucci, R.; Mauas, P.; Hilton, E. J. (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. arXiv:1406.7353. Bibcode:2014MNRAS.443.2561G. doi:10.1093/mnras/stu1313.
- ^ a b 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. arXiv:1112.4567. Bibcode:2012ApJ...748...93R. doi:10.1088/0004-637X/748/2/93. S2CID 41902340.
- ^ "HD 155876". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ Lippincott, S. L. (November 1959). "Parallax and mass ratio of Furuhjelm 46". Astronomical Journal. 64: 419–422. Bibcode:1959AJ.....64..419L. doi:10.1086/107962.
- ^ 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.
External links
- Diagram of orbit from U.S.Naval Obs. site Archived 2016-03-03 at the Wayback Machine
