π Lupi (Latinised to Pi Lupi) is a multiple star system in the southern constellation
Lupus. Two components form a wide binary pair with an orbital period of 517 years and a
semimajor axis of 1.59″. They belong to the Upper Centaurus Lupus component of the
Sco–Cen complex.[4]
At least one of the components is a
spectroscopic binary and produces eclipses 15.5 days apart, making it an
eclipsing binary. There are also other brightness variations with a period of 16 hours that are likely to be pulsations of the
Slowly pulsating B-type star. The eclipses are shallow, with the brightness dropping by only 1% or about 0.01 magnitudes. The amplitude of the pulsations is even smaller.[1]
π Lupi A (HR 5605, HD 133242) has been classified as a spectroscopic binary by at least two studies,[7][8] but both components may be spectroscopic binaries.[9]
References
^
abSharma, Awshesh N.; Bedding, Timothy R.; Saio, Hideyuki; White, Timothy R. (2022), "Pulsating B stars in the Scorpius–Centaurus Association with TESS", Monthly Notices of the Royal Astronomical Society, 515 (1): 828–840,
arXiv:2203.02582,
Bibcode:
2022MNRAS.515..828S,
doi:
10.1093/mnras/stac1816
^
abcNicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49,
Bibcode:
1978A&AS...34....1N
^
abNitschelm, C. (December 2004), Hilditch, R. W.; Hensberge, H.; Pavlovski, K. (eds.), "Discovery and confirmation of some double-lined spectroscopic binaries in the Sco-Cen Complex", Spectroscopically and Spatially Resolving the Components of the Close Binary Stars, Proceedings of the Workshop held 20–24 October 2003 in Dubrovnik, Croatia., ASP Conference Series, vol. 318,
Astronomical Society of the Pacific, pp. 291–293,
Bibcode:
2004ASPC..318..291N
^Kharchenko, N. V.; et al. (2007), "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations", Astronomische Nachrichten, 328 (9): 889–896,
arXiv:0705.0878,
Bibcode:
2007AN....328..889K,
doi:
10.1002/asna.200710776,
S2CID119323941
^Mason, Brian D.; et al. (December 2001), "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471,
Bibcode:
2001AJ....122.3466M,
doi:10.1086/323920