Location of δ Pictoris (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pictor |
| Right ascension | 06 10 17.908 |
| Declination | −54° 58′ 07.11″ |
| Apparent magnitude (V) | 4.72 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | B1/2(III)n (B0.5:III?np + B0.5/3:) |
| U−B color index | −1.00 |
| B−V color index | −0.229±0.008 |
| Variable type | β Lyr + β Cep |
| Astrometry | |
| Radial velocity (Rv) | +30.6±2.8 km/s |
| Proper motion (μ) | RA: −4.90 mas/yr Dec.: +7.41 mas/yr |
| Parallax (π) | 2.51 ± 0.15 mas |
| Distance | 1,300 ± 80 ly (400 ± 20 pc) |
| Absolute magnitude (MV) | −3.27 |
| Orbit | |
| Period (P) | 1.67254 d |
| Semi-major axis (a) | ≥ 3.83 Gm (0.0256 AU) |
| Eccentricity (e) | 0.050±0.17 |
| Periastron epoch (T) | 2,438,500.79±0.09 JD |
| Argument of periastron (ω) (secondary) | 90±18° |
| Semi-amplitude (K1) (primary) | 167.0±2.8 km/s |
| Details | |
| Primary | |
| Mass | 16.3 M☉ |
| Radius | 7.62 R☉ |
| Luminosity | 20,900 L☉ |
| Temperature | 25,200 K |
| Rotational velocity (v sin i) | 170 km/s |
| Secondary | |
| Mass | 8.6 M☉ |
| Radius | 5.05 R☉ |
| Luminosity | 4,790 L☉ |
| Temperature | 21,400 K |
| Other designations | |
| δ Pic, del Pic, FK5 235, GC 7898, HD 42933, HIP 29276, HR 2212, SAO 234359 | |
| Database references | |
| SIMBAD | data |
Delta Pictoris, Latinized from δ Pictoris, is a binary star system in the southern constellation Pictor. It is visible to the naked with a combined apparent visual magnitude of 4.72. The system is located at a distance of approximately 1,300 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of ~31 km/s. It is a runaway star system that is generating a bow shock as it moves through the interstellar medium.
The binary nature of this system was discovered by R. E. Wilson in 1914, then it was found to be variable by A. W. J. Cousins in 1951. A. D. A. Thackeray published orbital elements for the pair in 1966, showing they form an eclipsing double-lined spectroscopic binary with an orbital period of 1.67 days in essentially a circular orbit. The low inclination of the orbital plane results in shallow eclipses. The system is classified as a likely Beta Lyrae-type eclipsing binary with a peak magnitude of 4.65, which drops to 4.90 during the primary eclipse and 4.83 in the secondary eclipse. It is probably a detached binary system with no circumstellar material being found.
Both components of this system are massive main sequence stars with a combined stellar classification of B1/2(III)n. One member of the pair displays β Cep type pulsational behavior. Mass estimates give a primary with 16.3 times the mass of the Sun and a secondary with about half that.
References
- ^ Van Leeuwen, F. (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. Vizier catalog en try
- ^ 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. S2CID 119257644. Vizier catalog entry
- ^ Eaton, J. A.; Wu, C. -C. (May 1983). "ANS spectrophotometry : delta Pictoris as an upper-main-sequence Algol system". Publications of the Astronomical Society of the Pacific. 95: 319–324. Bibcode:1983PASP...95..319E. doi:10.1086/131165. S2CID 122266645.
- ^ Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 1. Ann Arbor, Michigan: Department of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H.
- Balona, L. A.; et al. (May 2019). "Rotational modulation in TESS B stars". Monthly Notices of the Royal Astronomical Society. 485 (3): 3457–3469. arXiv:1902.09470. Bibcode:2019MNRAS.485.3457B. doi:10.1093/mnras/stz586.
- Mermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie. 2168. Bibcode:2006yCat.2168....0M.Vizier catalog entry
- ^ Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 255195566.
- ^ Pedersen, May G.; et al. (February 2019). "Diverse Variability of O and B Stars Revealed from 2-minute Cadence Light Curves in Sectors 1 and 2 of the TESS Mission: Selection of an Asteroseismic Sample". The Astrophysical Journal Letters. 872 (1): 11. arXiv:1901.07576. Bibcode:2019ApJ...872L...9P. doi:10.3847/2041-8213/ab01e1. S2CID 118963697. L9.
- ^ Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities". Determination of Radial Velocities and Their Applications. 30: 57. Bibcode:1967IAUS...30...57E.
- ^ Thackeray, A. D. (1966). "The spectroscopic binary δ Pictoris". Monthly Notices of the Royal Astronomical Society. 131 (3): 435. Bibcode:1966MNRAS.131..435T. doi:10.1093/mnras/131.3.435.
- ^ Malkov, Oleg Yu (February 2020). "Semidetached double-lined eclipsing binaries: Stellar parameters and rare classes". Monthly Notices of the Royal Astronomical Society. 491 (4): 5489–5497. Bibcode:2020MNRAS.491.5489M. doi:10.1093/mnras/stz3363.
- "del Pic". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2022-01-26.
{{cite web}}: CS1 maint: postscript (link) - Noriega-Crespo, Alberto; et al. (February 1997). "Bow Shocks Around Runaway Stars. III. The High Resolution Maps". Astronomical Journal. 113: 780–786. Bibcode:1997AJ....113..780N. doi:10.1086/118298.
- "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
- Cousins, A. W. J. (October 1951). "Bright variable stars in southern hemisphere (first list)". The Observatory. 71: 199–201. Bibcode:1951Obs....71..199C.
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