This is a double-lined
spectroscopic binary star system with an orbital period of 31.39 days and an
eccentricity of 0.53.[6] The members are separated by a distance of less than 5
AU.[13] The primary component has a
stellar classification of A5IV, indicating that it has
evolved away from the
main sequence and is now a
subgiant star. However, the classification is uncertain and not consistent with the mass derived from the orbit.[7] It is among the least
variable of the stars that were observed by the
Hipparcos spacecraft, with a magnitude varying by only 0.0005.[14]
Based on observations using the
Spitzer Space Telescope, as reported in 2005, this system is emitting an
excess of infrared radiation. This emission can be explained by a circumbinary
ring of dust. The dust is emitting infrared radiation at a blackbody temperature of 100 K.[13] It is thought to extend from 50 to 400 AU away from the stars.[7]
Naming
In combination with
Alpha Trianguli, these stars were called Al Mīzān, which is
Arabic for "The Scale Beam".[12]
^
abcdJohnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99,
Bibcode:
1966CoLPL...4...99J
^
abcGray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Robinson, P. E. (2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I". The Astronomical Journal. 126 (4): 2048.
arXiv:astro-ph/0308182.
Bibcode:
2003AJ....126.2048G.
doi:
10.1086/378365.
S2CID119417105.
^Booth, M.; Kennedy, G.; Sibthorpe, B.; Matthews, B. C.; Wyatt, M. C.; Duchene, G.; Kavelaars, J. J.; Rodriguez, D.; Greaves, J. S.; Koning, A.; Vican, L.; Rieke, G. H.; Su, K. Y. L.; Moro-Martin, A.; Kalas, P. (2013). "Resolved debris discs around a stars in the Herschel DEBRIS survey". Monthly Notices of the Royal Astronomical Society. 428 (2): 1263.
arXiv:1210.0547.
Bibcode:
2013MNRAS.428.1263B.
doi:
10.1093/mnras/sts117.
^
abStansberry, J. A.; et al. (2005). "A Spitzer Survey for Debris Disks in Binary Star Systems". Protostars and Planets V, Proceedings of the Conference held October 24-28, 2005, in Hilton Waikoloa Village, Hawai'i. Protostars and Planets V. p. 8613.
Bibcode:
2005prpl.conf.8613S.