HD 151613

HD 151613 is a binary star[5] system in the northern circumpolar constellation of Draco. It is visible to the naked eye with an apparent visual magnitude of 4.84.[2] The distance to this star, as estimated from its annual parallax shift of 39.3 mas,[1] is 83 light years. It is moving closer to the Earth with a heliocentric radial velocity of −2 km/s.[4]

HD 151613
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension  16h 45m 17.88121s[1]
Declination +56° 46′ 54.7985″[1]
Apparent magnitude (V) 4.84[2]
Characteristics
Spectral type F2 V[3]
B−V color index 0.375±0.013[2]
Astrometry
Radial velocity (Rv)−2.0[4] km/s
Proper motion (μ) RA: 24.85 mas/yr
Dec.: 67.07 mas/yr
Parallax (π)39.2932 ± 0.3182[1] mas
Distance83.0 ± 0.7 ly
(25.4 ± 0.2 pc)
Absolute magnitude (MV)2.71[2]
Orbit[5]
Period (P)363.57 d
Eccentricity (e)0.35
Periastron epoch (T)2415232.4 JD
Argument of periastron (ω)
(secondary)		80.7°
Semi-amplitude (K1)
(primary)		6.0 km/s
Details
Mass1.43[4] M☉
Radius1.6[6] R☉
Luminosity6.91[2] L☉
Surface gravity (log g)4.05[4] cgs
Temperature6,630[7] K
Metallicity [Fe/H]−0.23[4] dex
Rotational velocity (v sin i)47.5±2.4[7] km/s
Age2.30[4] Gyr
Other designations
BD+57° 1702, FK5 627, GJ 9578, HD 151613, HIP 82020, HR 6237, SAO 30076, WDS 16453+5647[8]
Database references
SIMBADdata

This is a single-lined spectroscopic binary[3] system with an orbital period of 363.57 days and an eccentricity of 0.35.[5] The pair were resolved through speckle interferometry in 1977, showing an angular separation of 0.041″. They were later resolved in 1981 with a separation of 0.047″, but were unresolved during 20 other attempts between 1976–1991.[9] The system is a source of X-ray emission.[10] The visible component is an F-type main-sequence star with a stellar classification of F2 V.[3] It is around 2.3[4] billion years old with a projected rotational velocity of 48 km/s.[7]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  2. 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.
  3. Abt, Helmut A. (2009), "MK Classifications of Spectroscopic Binaries", The Astrophysical Journal Supplement, 180 (1): 117–18, Bibcode:2009ApJS..180..117A, doi:10.1088/0067-0049/180/1/117.
  4. Casagrande, L.; et al. (June 2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy and Astrophysics, 530: A138, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276.
  5. Pourbaix, D.; et al. (2004), "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits", Astronomy & Astrophysics, 424: 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213.
  6. Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition", Astronomy and Astrophysics, 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  7. Reiners, A. (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics, 446 (1): 267–277, arXiv:astro-ph/0509399, Bibcode:2006A&A...446..267R, doi:10.1051/0004-6361:20053911.
  8. "HD 151613". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-18.
  9. Hartkopf, William I.; Mason, Brian D. (September 2009), "Speckle Interferometry at Mount Wilson Observatory: Observations Obtained in 2006-2007 and 35 New Orbits", The Astronomical Journal, 138 (3): 813–826, Bibcode:2009AJ....138..813H, doi:10.1088/0004-6256/138/3/813.
  10. Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009), "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources", The Astrophysical Journal Supplement, 184 (1): 138–151, arXiv:0910.3229, Bibcode:2009ApJS..184..138H, doi:10.1088/0067-0049/184/1/138.
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