IU Aurigae

IU Aurigae

A visual band light curve for IU Aurigae, adapted from Özdemir et al. (2003)[1]
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]
Other designations
IU Aur, BD+34°1051, HD 35652, HIP 25565, SAO 58059, PPM 70395[5]
Database references
SIMBADdata

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] 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][8] 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]

  1. ^ Cite error: The named reference Özdemir was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Avvakumova2013 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Mayer1987 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Drechsel1994 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference AAVSOIU was invoked but never defined (see the help page).