 The star system AK Scorpii imaged by ALMA. The Binary star orbit was added for clarity. Credit: ALMA (ESO/NAOJ/NRAO), I. Czekala and G. Kennedy; NRAO/AUI/NSF, S. Dagnello | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 54m 44.8498s[1] |
| Declination | −36° 53′ 18.561″[1] |
| Apparent magnitude (V) | 9.00 |
| Characteristics | |
| Spectral type | F 5 IV-V[2] |
| Apparent magnitude (G) | 9.2823 ± 0.0223[1] |
| Variable type | Herbig Ae/Be star[2] |
| Astrometry | |
| Radial velocity (Rv) | -1.97 ± 0.5[3] km/s |
| Proper motion (μ) | RA: −8.399±0.116[1] mas/yr Dec.: −29.268±0.083[1] mas/yr |
| Parallax (π) | 7.1126 ± 0.0621 mas[1] |
| Distance | 459 ± 4 ly (141 ± 1 pc) |
| Orbit[3][4] | |
| Primary | AK Scorpii A |
| Companion | AK Scorpii B |
| Period (P) | 13.609 ± 0.001 days |
| Semi-major axis (a) | 0.16 au |
| Eccentricity (e) | 0.47 ± 0.01 |
| Inclination (i) | 115 ± 3° |
| Longitude of the node (Ω) | 48 ± 3° |
| Argument of periastron (ω) (secondary) | 186 ± 2° |
| Semi-amplitude (K1) (primary) | 64.7 ± 0.9 km/s |
| Semi-amplitude (K2) (secondary) | 65.5 ± 0.9 km/s |
| Details[4] | |
| AK Scorpii A | |
| Mass | 1.25 M☉ |
| Age | 18 Myr |
| AK Scorpii B | |
| Mass | 1.25 M☉ |
| Age | 18 Myr |
| Other designations | |
| Database references | |
| SIMBAD | AB |
AK Scorpii is a Herbig Ae/Be star[2] and spectroscopic binary star about 459 light-years distant in the constellation Scorpius. The star belongs to the nearby Upper Centaurus–Lupus star-forming region and the star is actively accreting material.[5] The binary is surrounded by a circumbinary disk that was imaged with VLT/SPHERE in scattered light[6] and with ALMA.[4]
- ^ a b c d e f 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. Gaia DR2 record for this source at VizieR.
- ^ a b c Castelli, F.; Hubrig, S.; Järvinen, S. P.; Schöller, M. (January 2020). "The chemical composition of the Herbig Ae SB2 system AK Sco (HD 152404)". MNRAS. 491 (2): 2010–2024. arXiv:1910.09372. Bibcode:2020MNRAS.491.2010C. doi:10.1093/mnras/stz3015. ISSN 0035-8711. S2CID 204801058.
- ^ a b Anthonioz, F.; Ménard, F.; Pinte, C.; Le Bouquin, J.-B.; Benisty, M.; Thi, W.-F.; Absil, O.; Duchêne, G.; Augereau, J.-C.; Berger, J.-P.; Casassus, S. (January 2015). "The VLTI/PIONIER near-infrared interferometric survey of southern T Tauri stars. I. First results". Astronomy & Astrophysics. 574: A41. arXiv:1412.1052. Bibcode:2015A&A...574A..41A. doi:10.1051/0004-6361/201424520. ISSN 0004-6361.
- ^ a b c Czekala, Ian; Chiang, Eugene; Andrews, Sean M.; Jensen, Eric L. N.; Torres, Guillermo; Wilner, David J.; Stassun, Keivan G.; Macintosh, Bruce (September 2019). "The Degree of Alignment between Circumbinary Disks and Their Binary Hosts". Astrophysical Journal. 883 (1): 22. arXiv:1906.03269. Bibcode:2019ApJ...883...22C. doi:10.3847/1538-4357/ab287b. ISSN 0004-637X. S2CID 182952526.
- ^ Czekala, I.; Andrews, S. M.; Jensen, E. L. N.; Stassun, K. G.; Torres, G.; Wilner, D. J. (June 2015). "A Disk-based Dynamical Mass Estimate for the Young Binary AK Sco". Astrophysical Journal. 806 (2): 154. arXiv:1505.01850. Bibcode:2015ApJ...806..154C. doi:10.1088/0004-637X/806/2/154. ISSN 0004-637X. S2CID 14513671.
- ^ Janson, Markus; Thalmann, Christian; Boccaletti, Anthony; Maire, Anne-Lise; Zurlo, Alice; Marzari, Francesco; Meyer, Michael R.; Carson, Joseph C.; Augereau, Jean-Charles; Garufi, Antonio; Henning, Thomas (January 2016). "Detection of Sharp Symmetric Features in the Circumbinary Disk around AK Sco". Astrophysical Journal Letters. 816 (1): L1. arXiv:1512.04552. Bibcode:2016ApJ...816L...1J. doi:10.3847/2041-8205/816/1/L1. hdl:2268/243722. ISSN 0004-637X. S2CID 53609671.