IU Aurigae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 05h 27m 52.40539s[2] |
| Declination | +34° 46′ 58.3435″[2] |
| Apparent magnitude (V) | 8.19 to 8.83[3] |
| Characteristics | |
| Spectral type | B0p + B1Vp[3] + ? |
| U−B color index | -0.66 |
| B−V color index | 0.18 |
| Variable type | Eclipsing binary[4] |
| Astrometry | |
| Radial velocity (Rv) | 9 ± 5 km/s |
| Proper motion (μ) | RA: −4.479[2] mas/yr Dec.: -9.049[2] mas/yr |
| Parallax (π) | 0.4786±0.5765 mas[2] |
| Distance | 6,500 ly (2,000 pc)[1] |
| Details[1] | |
| A | |
| Mass | 21.4±2.5 M☉ |
| Radius | 7.8±0.8 R☉ |
| Luminosity | 57,500 L☉ |
| Surface gravity (log g) | 3.99±0.17 cgs |
| Temperature | 32,000 K |
| B | |
| Mass | 14.5±2.0 M☉ |
| Radius | 7.1±0.8 R☉ |
| Luminosity | 26,300 L☉ |
| Surface gravity (log g) | 3.89±0.19 cgs |
| Temperature | 27,540±290 K |
| Other designations | |
| IU Aur, BD+34°1051, HD 35652, HIP 25565, SAO 58059, PPM 70395[5] | |
| Database references | |
| SIMBAD | data |
IU Aurigae is a triple star[6] system in the constellation Auriga, consisting of an eclipsing binary pair orbiting a third component with a period of 335 years.[7] This system is too faint to be viewed with the naked eye, having a peak apparent visual magnitude of 8.19.[3]
Pavel Mayer discovered that the star's brightness varies in 1964.[8] The eclipsing pair form a Beta Lyrae-type semidetached binary of two Bp stars[3] with a period of 1.81147435 days.[4] During the primary eclipse, the visual magnitude of the system drops to 8.89, while for the secondary it decreases to 8.74.[3][9] The third component is a massive object with 17–18 M☉, and may actually be a binary – which would make this a quadruple star system.[7]
References
[edit]- ^ a b c Özdemir, S.; Mayer, P.; Drechsel, H.; Demircan, O.; Ak, H. (May 2003). "Refinement of third body parameters and new photometric results for the early-type multiple system IU Aurigae". Astronomy & Astrophysics. 403 (2): 675–681. Bibcode:2003A&A...403..675O. doi:10.1051/0004-6361:20030392.
- ^ a b c d e 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 d e Avvakumova, E. A.; et al. (October 2013). "Eclipsing variables: Catalogue and classification". Astronomische Nachrichten. 334 (8): 860. Bibcode:2013AN....334..860A. doi:10.1002/asna.201311942. hdl:10995/27061.
- ^ a b 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 125853869.
- ^ "IU Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-18.
- ^ Mayer, P.; Drechsel, H. (September 1987). "Up-to-date parameters of the eclipsing triple system IU AUR". Astronomy and Astrophysics. 183 (1): 61–65. Bibcode:1987A&A...183...61M.
- ^ a b Drechsel, H.; Haas, S.; Lorenz, R.; Mayer, P. (April 1994). "New photometric and spectroscopic results for IU Aurigae -- an early-type eclipsing binary in a multiple system". Astronomy and Astrophysics. 284 (3): 853–864. Bibcode:1994A&A...284..853D.
- ^ Mayer, P. (March 1964). "New Bright Early Type Eclipsing Variable" (PDF). Information Bulletin on Variable Stars. 49: 1. Bibcode:1964IBVS...49....1M. Retrieved 29 November 2024.
- ^ Watson, Christopher (January 4, 2010). "IU Aurigae". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 2019-08-18.
