AK Pictoris

AK Pictoris is a star system in the constellation Pictor. Its combined apparent magnitude is 6.182.[2] Based on the system's parallax, it is located 69 light-years (21.3 parsecs) away.[1] AK Pictoris is a member of the AB Doradus moving group,[9] a group of stars with similar motions that are thought to be associated.

AK Pictoris
Observation data
Epoch J2000      Equinox J2000
Constellation Pictor
Right ascension 06h 38m 00.36576s[1]
Declination −61° 32′ 00.1941″[1]
Apparent magnitude (V) 6.182[2]
(6.32 / 8.77)[3]
Characteristics
Spectral type G2 + K5:[4]
B−V color index +0.62[5]
Variable type BY Dra[6]
Astrometry
Radial velocity (Rv)32.10 ± 0.5[7] km/s
Proper motion (μ) RA: -47.84[1] mas/yr
Dec.: 72.73[1] mas/yr
Parallax (π)46.96 ± 0.81[1] mas
Distance69 ± 1 ly
(21.3 ± 0.4 pc)
Absolute magnitude (MV)4.63[8] + ?
Orbit[3]
Period (P)217.6 yr
Semi-major axis (a)2.004″
Eccentricity (e)0.336
Inclination (i)93.9°
Longitude of the node (Ω)91.6°
Periastron epoch (T)2033.9
Argument of periastron (ω)
(secondary)		357.3°
Details
AK Pic A
Mass1.03[9] M☉
Radius1.22[9] R☉
Luminosity1.45[9] L☉
Temperature5860[4] K
Rotational velocity (v sin i)15.1 ± 0.8[8] km/s
AK Pic B
Luminosity0.25[4] L☉
Temperature4400[4] K
Rotational velocity (v sin i)15.5 ± 2.0[8] km/s
Other designations
CD−61° 1428, GJ 3400, HD 48189, HIP 31711, HR 2468, SAO 249604[2]
Database references
SIMBADdata

AK Pictoris is a binary star. Its two stars orbit each other every 217.6 years, separated by 2.004″.[3] The primary star is a G-type star[4] with similar properties to the Sun. The secondary star is a K-type star.[4] The primary star is a young BY Draconis variable,[6] a class of variable stars that derive their variability from stellar rotation. It is also known to host a debris disk, inferred from its infrared excess.[9]

References
  1. van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
  2. "V* AK Pic". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 July 2017.
  3. "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 20 July 2017.
  4. McCarthy, Kyle; White, Russel J. (2012). "The Sizes of the Nearest Young Stars". The Astronomical Journal. 143 (6): 134. arXiv:1201.6600. Bibcode:2012AJ....143..134M. doi:10.1088/0004-6256/143/6/134. S2CID 118538522.
  5. Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
  6. Samus', N. N.; Goranskii, V. P.; Durlevich, O. V.; Zharova, A. V.; Kazarovets, E. V.; Kireeva, N. N.; Pastukhova, E. N.; Williams, D. B.; Hazen, M. L. (2003). "An Electronic Version of the Second Volume of the General Catalogue of Variable Stars with Improved Coordinates". Astronomy Letters. 29 (7): 468. Bibcode:2003AstL...29..468S. doi:10.1134/1.1589864. S2CID 16299532.
  7. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  8. Fuhrmann, K.; Chini, R. (2015). "Multiplicity Among F-Type Stars. II". The Astrophysical Journal. 809 (1): 107. Bibcode:2015ApJ...809..107F. doi:10.1088/0004-637X/809/1/107.
  9. Plavchan, Peter; Werner, M. W.; Chen, C. H.; Stapelfeldt, K. R.; Su, K. Y. L.; Stauffer, J. R.; Song, I. (2009). "New Debris Disks Around Young, Low-Mass Stars Discovered with Thespitzer Space Telescope". The Astrophysical Journal. 698 (2): 1068–1094. arXiv:0904.0819. Bibcode:2009ApJ...698.1068P. doi:10.1088/0004-637X/698/2/1068. S2CID 51417657.


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