IU Aurigae
{{Short description|Triple star system in the constellation Auriga}}
{{Starbox begin}}
{{Starbox image
| image = 250px
| caption = A visual band light curve for IU Aurigae, adapted from Özdemir et al. (2003)
}}
{{Starbox observe
| epoch = J2000
| dec = {{DEC|+34|46|58.3435}}
| appmag_v = {{nowrap|8.19 to 8.83}}
| constell = Auriga
}}
{{Starbox character
| type =
| class = {{nowrap|B0p + B1Vp}} + ?
| b-v = 0.18
| u-b = -0.66
}}
{{Starbox astrometry
| radial_v = 9 ± 5
| parallax = 0.4786
| p_error = 0.5765
| absmag_v =
}}{{Starbox catalog
| names = {{odlist | V=IU Aur | BD=+34°1051 | HD=35652 | HIP=25565 | SAO=58059 | PPM=70395 }}
}}
{{Starbox reference
| Simbad = IU+Aur
}}
{{Starbox end}}
IU Aurigae is a triple star system in the constellation Auriga, consisting of an eclipsing binary pair orbiting a third component with a period of 335 years. This system is too faint to be viewed with the naked eye, having a peak apparent visual magnitude of 8.19.
Pavel Mayer discovered that the star's brightness varies in 1964. The eclipsing pair form a Beta Lyrae-type semidetached binary of two Bp stars with a period of 1.81147435 days. During the primary eclipse, the visual magnitude of the system drops to 8.89, while for the secondary it decreases to 8.74. The third component is a massive object with {{nowrap|17–18 }}{{solar mass}}, and may actually be a binary – which would make this a quadruple star system.
References
{{reflist|refs=
{{cite DR2|182856896896621952}}
{{cite simbad | title=IU Aur | access-date=2019-08-18 }}
| title=Up-to-date parameters of the eclipsing triple system IU AUR
| last1=Mayer | first1=P. | last2=Drechsel | first2=H.
| journal=Astronomy and Astrophysics
| volume=183 | issue=1 | pages=61–65 | date=September 1987
| bibcode=1987A&A...183...61M | postscript=. }}
| title=Eclipsing variables: Catalogue and classification
| display-authors=1 | last1=Avvakumova | first1=E. A.
| last2=Malkov | first2=O. Yu. | last3=Kniazev | first3=A. Yu.
| journal=Astronomische Nachrichten
| volume=334 | issue=8 | pages=860 | date=October 2013
| doi=10.1002/asna.201311942 | bibcode=2013AN....334..860A | hdl=10995/27061 | hdl-access=free }}
| last1=Mayer | first1=P. | title=New Bright Early Type Eclipsing Variable
| journal=Information Bulletin on Variable Stars | date=March 1964 | volume=49
| page=1 | bibcode=1964IBVS...49....1M | url=https://ibvs.konkoly.hu/pub/ibvs/0001/0049.pdf
| access-date=29 November 2024}}
| display-authors=1 | last1=Samus | first1=N. N.
| last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V.
| last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N.
| title=General Catalogue of Variable Stars
| version=5.1 | journal=Astronomy Reports
| year=2017 | volume=61 | issue=1 | pages=80–88
| bibcode=2017ARep...61...80S | doi=10.1134/S1063772917010085 | s2cid=125853869 }}
| title=New photometric and spectroscopic results for IU Aurigae -- an early-type eclipsing binary in a multiple system
| last1=Drechsel | first1=H. | last2=Haas | first2=S.
| last3=Lorenz | first3=R. | last4=Mayer | first4=P.
| journal=Astronomy and Astrophysics
| volume=284 | issue=3 | pages=853–864 | date=April 1994
| bibcode=1994A&A...284..853D | postscript=. }}
| url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=4000
| title=IU Aurigae | last=Watson | first=Christopher
| date=January 4, 2010 | postscript=.
| work=The International Variable Star Index
| publisher=American Association of Variable Star Observers
| access-date=2019-08-18 }}
}}
{{Stars of Auriga}}
{{DEFAULTSORT:IU Aurigae}}
Category:B-type main-sequence stars
Category:Spectroscopic binaries