GG Lupi is an eclipsing binary star in the southern constellation of Lupus. Most of the time it is a magnitude 5.6 object, making it faintly visible to the naked eye, but during the primary eclipse its brightness falls to 6.1.[1] GG Lupi is located one half-degree (one full moon diameter) west of the third-magnitude star Delta Lupi.

This star was found to be a spectroscopic binary in 1930,[2] and its eclipses were detected in observations during 1964.[3] Its location in the sky, distance (~490 light-years)[4] and proper motion make it a likely member of the Scorpius–Centaurus association within the Gould's Belt star-formation region.[5] The two stars comprising this binary are both very young main-sequence stars of spectral type B. They are estimated to be about 20 million years old, placing them near the zero-age main sequence.[6] Their orbit is somewhat eccentric (e=0.15) and the period of apsidal precession is 102 years.[7]

References

  1. ^ "GG Lup". The International Variable Star Index. AAVSO. Retrieved 10 December 2022.
  2. ^ Neubauer, F. J. (August 1930). "Forty-two Spectroscopic Binary Stars". Publications of the Astronomical Society of the Pacific. 42 (248): 235. Bibcode:1930PASP...42..235N. doi:10.1086/124043. S2CID 121035980
  3. ^ Smith, Lindsey F. (April 1966). "HR 5687: A New Eclipsing Binary". Publications of the Astronomical Society of the Pacific. 78 (462): 168. Bibcode:1966PASP...78..168S. doi:10.1086/128320. S2CID 120477301
  4. ^
  5. ^ Budding, E.; Butland, R.; Blackford, M. (April 2015). "Absolute parameters of young stars: GG Lup and μ1 Sco". Monthly Notices of the Royal Astronomical Society. 448 (4): 3784–3796. arXiv:1502.04360. Bibcode:2015MNRAS.448.3784B. doi:10.1093/mnras/stv234
  6. ^ Andersen, J.; Clausen, J. V.; Gimenez, A. (October 1993). "Absolute dimensions of eclipsing binaries. XX. GG LUPI : young metal-deficient B stars". Astronomy and Astrophysics. 277: 439–451. Bibcode:1993A&A...277..439A
  7. ^ Wolf, M. & Zejda, M. (July 2005). "Apsidal motion in southern eccentric eclipsing binaries: V539 Ara, GG Lup, V526 Sgr and AO Vel". Astronomy and Astrophysics. 437 (2): 545–551. Bibcode:2005A&A...437..545W. doi:10.1051/0004-6361:20041868. S2CID 121307009