AK Pictoris

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AK Pictoris
AKPicLightCurve.png
A light curve for AK Pictoris, plotted from TESS data. [1]
Observation data
Epoch J2000        Equinox J2000
Constellation Pictor
Right ascension 06h 38m 00.36576s [2]
Declination −61° 32′ 00.1941″ [2]
Apparent magnitude  (V)6.182 [3]
(6.32 / 8.77) [4]
Characteristics
Spectral type G2 + K5: [5]
B−V color index +0.62 [6]
Variable type BY Dra [7]
Astrometry
Radial velocity (Rv)32.10 ± 0.5 [8] km/s
Proper motion (μ)RA: -47.84 [2] mas/yr
Dec.: 72.73 [2] mas/yr
Parallax (π)46.96±0.81  mas [2]
Distance 69 ± 1  ly
(21.3 ± 0.4  pc)
Absolute magnitude  (MV)4.63 [9] + ?
Orbit [4]
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
Mass 1.03 [10]   M☉
Radius 1.22 [10]   R☉
Luminosity 1.45 [10]   L☉
Temperature 5860 [5]   K
Rotational velocity (v sin i)15.1 ± 0.8 [9]  km/s
AK Pic B
Luminosity0.25 [5]   L☉
Temperature 4400 [5]   K
Rotational velocity (v sin i)15.5 ± 2.0 [9]  km/s
Other designations
CD−61° 1428, GJ 3400, HD 48189, HIP 31711, HR 2468, SAO 249604 [3]
Database references
SIMBAD data

AK Pictoris is a star system in the constellation Pictor. Its combined apparent magnitude is 6.182. [3] Based on the system's parallax, it is located 69 light-years (21.3 parsecs) away. [2] AK Pictoris is a member of the AB Doradus moving group, [10] a group of stars with similar motions that are thought to be associated.

AK Pictoris is a binary star. Its two stars orbit each other every 217.6 years, separated by 2.004″. [4] The primary star is a G-type star [5] with similar properties to the Sun. The secondary star is a K-type star. [5] The primary star is a young BY Draconis variable, [7] 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. [10]

References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 7 September 2024.
  2. 1 2 3 4 5 6 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. Archived from the original on 2019-12-07. Retrieved 2017-07-20.
  3. 1 2 3 "V* AK Pic". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 20 July 2017.
  4. 1 2 3 "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 20 July 2017.
  5. 1 2 3 4 5 6 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.
  6. ↑ Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
  7. 1 2 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.
  8. ↑ 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.
  9. 1 2 3 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. S2CID   126218052.
  10. 1 2 3 4 5 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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