HR 6902 (also designated V2291 Oph) is a binary system located 790 light years away[2] from the Sun in the Ophiuchus constellation. The system includes an orange bright giant star and a B-type main sequence star, forming an eclipsing binary of Zeta Aurigae type. The system is also surrounded by a warm circumstellar envelope and the spectra show silicon and carbon absorption up to a distance of 3.3 giant radii.[4]

References

  1. ^ Griffin, R. E. M.; Marshall, K. P.; Griffin, R. F.; Schroeder, K. P. (September 1995). "Optical spectra of ζ Aurigae binary systems. VII. The 1987 and 1989 eclipses of HR 6902". Astronomy and Astrophysics. 301: 217–230. Bibcode:1995A&A...301..217G. Retrieved 4 February 2022.
  2. ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
  3. ^ a b Jasniewicz, G.; et al. (February 1999), "Late-type giants with infrared excess. I. Lithium abundances", Astronomy and Astrophysics, 342: 831–838, Bibcode:1999A&A...342..831J
  4. ^ a b c d e f g h Kirsch; Baade, R.; Reimers, D. (2001). "The warm circumstellar envelope and wind of the G9 IIb star HR 6902". Astronomy and Astrophysics. 379 (3): 925–935. arXiv:astro-ph/0008378. Bibcode:2001A&A...379..925K. doi:10.1051/0004-6361:20011117. S2CID 12157488.
Allikas: https://en.wikipedia.org/wiki/HR_6902
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