Astronomy:IU Aurigae
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Short description: Triple star system in the constellation Auriga
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[2] mas |
| Distance | 6,500 ly (2,000 pc) |
| 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 | |
| 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
- ↑ 1.0 1.1 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. doi:10.1051/0004-6361:20030392. Bibcode: 2003A&A...403..675O.
- ↑ 2.0 2.1 2.2 2.3 2.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 3.4 Avvakumova, E. A. et al. (October 2013). "Eclipsing variables: Catalogue and classification". Astronomische Nachrichten 334 (8): 860. doi:10.1002/asna.201311942. Bibcode: 2013AN....334..860A.
- ↑ 4.0 4.1 Samus, N. N. et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1 61 (1): 80–88. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S.
- ↑ "IU Aur". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=IU+Aur.
- ↑ 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.
- ↑ 7.0 7.1 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". Information Bulletin on Variable Stars 49: 1. Bibcode: 1964IBVS...49....1M. https://ibvs.konkoly.hu/pub/ibvs/0001/0049.pdf. Retrieved 29 November 2024.
- ↑ Watson, Christopher (January 4, 2010). "IU Aurigae". The International Variable Star Index. American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=4000.
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