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.
| 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 |
| Distance | 69 ± 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 | |
| Mass | 1.03[9] M☉ |
| Radius | 1.22[9] R☉ |
| Luminosity | 1.45[9] L☉ |
| Temperature | 5860[4] K |
| Rotational velocity (v sin i) | 15.1 ± 0.8[8] km/s |
| AK Pic B | |
| Luminosity | 0.25[4] L☉ |
| Temperature | 4400[4] K |
| Rotational velocity (v sin i) | 15.5 ± 2.0[8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
- 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.
- "V* AK Pic". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 July 2017.
- "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 20 July 2017.
- 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.
- Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
- 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.
- 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.
- Fuhrmann, K.; Chini, R. (2015). "Multiplicity Among F-Type Stars. II". The Astrophysical Journal. 809: 107. Bibcode:2015ApJ...809..107F. doi:10.1088/0004-637X/809/1/107.
- 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. arXiv:0904.0819. Bibcode:2009ApJ...698.1068P. doi:10.1088/0004-637X/698/2/1068.
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