Astronomy:WW Aurigae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Auriga |
| Right ascension | 06h 32m 27.18445s[2] |
| Declination | +32° 27′ 17.6330″[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: −26.347[2] mas/yr Dec.: −17.343[2] mas/yr |
| Parallax (π) | 10.9979 ± 0.0829[2] mas |
| Distance | 297 ± 2 ly (90.9 ± 0.7 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 | |
| Mass | 1.964±0.007 M☉ |
| Radius | 1.980±0.009 R☉ |
| Luminosity | 13.5[8] L☉ |
| Surface gravity (log g) | 4.160±0.007 cgs |
| Temperature | 8,350±200 K |
| Rotational velocity (v sin i) | 35±10 km/s |
| Age | 565±15 Myr |
| WW Aur b | |
| Mass | 1.814±0.007 M☉ |
| Radius | 1.807±0.009 R☉ |
| Luminosity | 10.5[8] L☉ |
| Surface gravity (log g) | 4.165±0.007 cgs |
| Temperature | 8,170±300 K |
| Rotational velocity (v sin i) | 55±10[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 11.0 mas,[2] 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 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 and Heinrich Van Solowiew in 1913.[10] Both components are metallic-lined, or Am stars, with a spectrum showing a deficiency of calcium and scandium, and an overabundance of heavier elements.[11] 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
- ↑ "Hipparcos Tools Interactive Data Access". ESA. https://www.cosmos.esa.int/web/hipparcos/interactive-data-access.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.
- ↑ 3.0 3.1 3.2 3.3 3.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 4.0 4.1 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. doi:10.1007/BF02709302. Bibcode: 1991JApA...12..133S.
- ↑ 5.0 5.1 5.2 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, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
- ↑ 6.0 6.1 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.
- ↑ 7.0 7.1 Southworth, J.; Smalley, B.; Maxted, P. F. L.; Etzel, P. B. (December 2004). "The A-Star Puzzle, held in Poprad, Slovakia, July 8-13, 2004". in Zverko, J.; Ziznovsky, J.; Adelman, S. J. et al.. 224. Cambridge, UK: Cambridge University Press. pp. 548–561. doi:10.1017/S1743921305009324. Bibcode: 2004IAUS..224..548S.
- ↑ 8.0 8.1 Southworth, J. (July 2015), "DEBCat: A Catalog of Detached Eclipsing Binary Stars", in Rucinski, Slavek M.; Torres, Guillermo; Zejda, Miloslav, Living Together: Planets, Host Stars and Binaries, Proceedings of a conference held 8-12 September 2014 in Litomyšl, Czech Republic, ASP Conference, 496, San Francisco, pp. 164–165, Bibcode: 2015ASPC..496..164S
- ↑ "HD 46052". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+46052.
- ↑ 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.
- ↑ 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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