}}{{Starbox reference
| Simbad = 83+UMa
}}{{Starbox end}}83 Ursae Majoris is a candidate binary star[17] system in the northern circumpolar constellation of Ursa Major. This is a semiregular variable star, like Mira; for that reason it has been given the variable star designation IQ Ursae Majoris. It ranges in brightness from apparent visual magnitude 4.69 to 4.75.[6] Percy and Au (1994) identified it as a small amplitude red variable with an irregular behavior, having a characteristic time scale of 20 days.[19] Based upon an annual parallax shift of {{Val|6.23|0.22|ul=mas}},[1] it is located roughly 520 light years from the Sun. The system is moving closer with a heliocentric radial velocity of −18.6[7] km/s.
The visible component is an evolved red giant with a stellar classification of M2 III.[4] It is a marginal barium star, showing an enhanced abundance of s-process elements in its outer atmosphere. This material may have been acquired during a previous mass transfer from a now white dwarf companion, or self-enriched by a dredge-up during the asymptotic giant branch process.[23]
References
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