IU Aurigae

IU Aurigae is a triple star[5] system in the constellation Auriga, consisting of an eclipsing binary pair orbiting a third component with a period of 335 years.[6] This system is too faint to be viewed with the naked eye, having a peak apparent visual magnitude of 8.19.[2] The eclipsing pair form a Beta Lyrae-type semidetached binary of two Bp stars[2] with a period of 1.81147435 days.[3] During the primary eclipse, the visual magnitude of the system drops to 8.89, while for the secondary it decreases to 8.74.[2][7] 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.[6]

IU Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 05h 27m 52.40539s[1]
Declination +34° 46′ 58.3435″[1]
Apparent magnitude (V) 8.19 to 8.83[2]
Characteristics
Spectral type B0p + B1Vp[2] + ?
U−B color index -0.66
B−V color index 0.18
Variable type Eclipsing binary[3]
Astrometry
Radial velocity (Rv)9 ± 5 km/s
Proper motion (μ) RA: −4.479[1] mas/yr
Dec.: -9.049[1] mas/yr
Parallax (π)0.4786 ± 0.5765[1] mas
Other designations
IU Aur, BD+34°1051, HD 35652, HIP 25565, SAO 58059, PPM 70395[4]
Database references
SIMBADdata

References
  1. 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.
  2. 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
  3. 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.
  4. "IU Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-18.
  5. 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.
  6. 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.
  7. Watson, Christopher (January 4, 2010), "IU Aurigae", The International Variable Star Index, American Association of Variable Star Observers, retrieved 2019-08-18.
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