WW Aurigae

WW Aurigae

A light curve for WW Aurigae, plotted from Hiparcos data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 06h 32m 27.18477s[2]
Declination +32° 27′ 17.6324″[2]
Apparent magnitude (V) 5.82[3]
Characteristics
Spectral type A4m + A5m[4]
B−V color index 0.188±0.007[3]
Variable type EA[5]
Astrometry
Radial velocity (Rv)−8.7±0.9[3] km/s
Proper motion (μ) RA: −26.3507[2] mas/yr
Dec.: −17.343[2] mas/yr
Parallax (π)11.1431 ± 0.0691 mas[2]
Distance293 ± 2 ly
(89.7 ± 0.6 pc)
Absolute magnitude (MV)1.29[3]
Orbit[6]
Period (P)2.525 d
Eccentricity (e)0.00
Periastron epoch (T)2,432,945.539±1.0 JD
Argument of periastron (ω)
(secondary)		0.00°
Semi-amplitude (K1)
(primary)		115.6 km/s
Semi-amplitude (K2)
(secondary)		127.7 km/s
Details[7]
WW Aur A
Mass1.964±0.007 M☉
Radius1.980±0.009 R☉
Luminosity13.5[8] L☉
Surface gravity (log g)4.160±0.007 cgs
Temperature8,350±200 K
Rotational velocity (v sin i)35±10 km/s
Age565±15 Myr
WW Aur B
Mass1.814±0.007 M☉
Radius1.807±0.009 R☉
Luminosity10.5[8] L☉
Surface gravity (log g)4.165±0.007 cgs
Temperature8,170±300 K
Rotational velocity (v sin i)55±10[7] km/s
Other designations
WW Aur, BD+32°1324, FK5 2500, HD 46052, HIP 31173, HR 2372, SAO 59194[9]
Database references
SIMBADdata

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,[5] which is bright enough to be dimly visible to the naked eye. Based upon an annual parallax shift of 11.1 mas,[2] it is located 293 light years from the Earth. The system is moving further away with a heliocentric radial velocity of −9 km/s, having come to within 212.5 ly 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.[6] It was discovered to be variable independently by Friedrich Schwab[10] and Heinrich Van Solowiew in 1918.[11] It was given its variable star designation in 1919.[12] Both components are metallic-lined, or Am stars, with a spectrum showing a deficiency of calcium and scandium, and an overabundance of heavier elements.[13] 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.[5]

References

  1. ^ "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
  2. ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ a b c d e Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  4. ^ a b Sreedhar Rao, S.; Abhyankar, K. D. (1991). "MK morphological study of AM stars at 66 A/mm". Journal of Astrophysics and Astronomy. 12 (2): 133. Bibcode:1991JApA...12..133S. doi:10.1007/BF02709302. S2CID 59324843.
  5. ^ a b c Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
  6. ^ a b Kitamura, M.; et al. (1976). "Investigation of the metallic-line eclipsing binary system WW Aurigae. II - Spectrographic study". Tokyo Astronomical Observatory, Annals. Second. 16 (1): 22–36. Bibcode:1976AnTok..16...22K.
  7. ^ a b Southworth, J.; et al. (December 2004). "Accurate fundamental parameters of eclipsing binary stars". In Zverko, J.; Ziznovsky, J.; Adelman, S. J.; Weiss, W. W. (eds.). The A-Star Puzzle, held in Poprad, Slovakia, July 8-13, 2004. IAU Symposium. Vol. 224. Cambridge, UK: Cambridge University Press. pp. 548–561. arXiv:astro-ph/0408227. Bibcode:2004IAUS..224..548S. doi:10.1017/S1743921305009324.
  8. ^ a b Southworth, J. (July 2015). "DEBCat: A Catalog of Detached Eclipsing Binary Stars". In Rucinski, Slavek M.; Torres, Guillermo; Zejda, Miloslav (eds.). Living Together: Planets, Host Stars and Binaries, Proceedings of a conference held 8-12 September 2014 in Litomyšl, Czech Republic. ASP Conference. Vol. 496. San Francisco. pp. 164–165. arXiv:1411.1219. Bibcode:2015ASPC..496..164S.
  9. ^ "HD 46052". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 22 August 2018.
  10. ^ Schwab, Friedrich (March 1918). "Ein neuer Veränderlicher vom Algoltypus. 3.1918 Aurigae". Astronomische Nachrichten. 206 (8): 67. Bibcode:1918AN....206Q..67S. doi:10.1002/asna.19182060805. Retrieved 2 December 2024.
  11. ^ Dugan, Raymond Smith (1930). "The Eclipsing Variables WW Aurigae, W Ursae Minoris". Contributions from the Princeton University Observatory. 10: 1–27. Bibcode:1930CoPri..10....1D.
  12. ^ Hartwig; Kempf; Müller (January 1919). "Benennung von neu entdeckten veränderlichen Sternen". Astronomische Nachrichten. 208 (5): 57–68. Bibcode:1919AN....208...57.. doi:10.1002/asna.19182080502. Retrieved 2 December 2024.
  13. ^ Pavlovski, K.; et al. (April 2008). "Spectral disentangling of the metallic-lined binary system WW Aurigae". Contributions of the Astronomical Observatory Skalnaté Pleso. 38 (2): 437–438. Bibcode:2008CoSka..38..437P.

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