}}{{Starbox reference
| Simbad = HD+46052
}}{{Starbox end}}WW Aurigae is an eclipsing binary star system in the northern constellation of Auriga. It has a combined maximum apparent visual magnitude of 5.86,[6] which is bright enough to be dimly visible to the naked eye. Based upon an annual parallax shift of {{Val|11.0|ul=mas}},[1] it is located 297 light years from the Earth. The system is moving further away with a heliocentric radial velocity of −9 km/s, having come to within {{Convert|65.15|pc|ly|abbr=on|disp=out}} some 3.12 million years ago.[3]This is a double-lined[4] spectroscopic binary system, having a circular orbit with a period of 2.5 days.[12] It was discovered to be variable independently by Friedrich Schwab and Heinrich Van Solowiew in 1913.[23] Both components are metallic-lined, or Am stars, with a spectrum showing a deficiency of calcium and scandium, and an overabundance of heavier elements.[24] Together they form an EA, or Algol-type, eclipsing binary with the primary occultation reducing the net magnitude to a minimum of 6.54 and the secondary eclipse lowering it to 6.43, over a cycle time of 2.52501936 days.[6]
Variations in the orbital period with a cycle time of around 112.2 years may indicate the presence of a third body in the system. This object would need at least 6.43 times the mass of the Sun yet emit no spectral lines, and hence it is a candidate black hole.[26]
References
1. ^1 2 3 4 5 6 {{cite DR2}}
2. ^1 2 3 4 5 {{cite journal | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 }}
3. ^1 2 {{cite journal | title=MK morphological study of AM stars at 66 A/mm | journal=Journal of Astrophysics and Astronomy | last1=Sreedhar Rao | first1=S. | last2=Abhyankar | first2=K. D. | volume=12 | issue=2 | pages=133 | year=1991 | bibcode=1991JApA...12..133S | doi=10.1007/BF02709302 }}
4. ^1 2 {{cite journal | title=Investigation of the metallic-line eclipsing binary system WW Aurigae. II - Spectrographic study | display-authors=1 | last1=Kitamura | first1=M. | last2=Kim | first2=T.-H. | last3=Kiyokawa | first3=M. | journal=Tokyo Astronomical Observatory, Annals | series=Second | volume=16 | issue=1 | pages=22–36 | year=1976 | bibcode=1976AnTok..16...22K }}
5. ^1 {{cite journal | title=The Eclipsing Variables WW Aurigae, W Ursae Minoris | last1=Dugan | first1=Raymond Smith | journal=Contributions from the Princeton University Observatory | volume=10 | pages=1–27 | year=1930 | bibcode=1930CoPri..10....1D }}
6. ^1 2 {{cite conference | contribution=Accurate fundamental parameters of eclipsing binary stars | last1=Southworth | first1=J. | last2=Smalley | first2=B. | last3=Maxted | first3=P. F. L. | last4=Etzel | first4=P. B. | title=The A-Star Puzzle, held in Poprad, Slovakia, July 8-13, 2004 | editor1-first=J. | editor1-last=Zverko | editor2-first=J. | editor2-last=Ziznovsky | editor3-first=S. J. | editor3-last=Adelman | editor4-first=W. W. | editor4-last=Weiss | series=IAU Symposium | volume=224 | date=December 2004 | publication-place=Cambridge, UK | publisher=Cambridge University Press | pages=548–561 | display-authors=1 | doi=10.1017/S1743921305009324 | bibcode=2004IAUS..224..548S | arxiv=astro-ph/0408227 }}
7. ^1 2 {{citation | contribution=DEBCat: A Catalog of Detached Eclipsing Binary Stars | last1=Southworth | first1=J. | title=Living Together: Planets, Host Stars and Binaries, Proceedings of a conference held 8-12 September 2014 in Litomyšl, Czech Republic | editor1-first=Slavek M. | editor1-last=Rucinski | editor2-first=Guillermo | editor2-last=Torres | editor3-first=Miloslav | editor3-last=Zejda | series=ASP Conference | volume=496 | publication-place=San Francisco | publisher=Astronomical Society of the Pacific | page=164 | date=July 2015 | bibcode=2015ASPC..496..164S }}
8. ^1 {{citation | title=The most plausible explanation of the cyclic period changes in close binaries: the case of the RS CVn-type binary WW Dra | last1=Liao | first1=W. -P. | last2=Qian | first2=S. -B. | journal=Monthly Notices of the Royal Astronomical Society | volume=405 | issue=3 | pages=1930–1939 | date=July 2010 | doi=10.1111/j.1365-2966.2010.16584.x | bibcode=2010MNRAS.405.1930L }}
9. ^1 {{citation | title=Spectral disentangling of the metallic-lined binary system WW Aurigae | display-authors=1 | last1=Pavlovski | first1=K. | last2=Southworth | first2=J. | last3=Tamajo | first3=E. | journal=Contributions of the Astronomical Observatory Skalnaté Pleso | volume=38 | issue=2 | pages=437–438 | date=April 2008 | bibcode=2008CoSka..38..437P }}
10. ^1 2 3 {{citation | title=General catalogue of variable stars: Version GCVS 5.1 | 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 | journal=Astronomy Reports | volume=61 | pages=80 | year=2017 | postscript=. | doi=10.1134/S1063772917010085 | bibcode=2017ARep...61...80S }}