Epsilon Arietis

Epsilon Arietis is a visual binary star system in the northern constellation of Aries. Its name is a Bayer designation that is Latinized from ε Arietis, and abbreviated Epsilon Ari or ε Ari. This system has a combined apparent visual magnitude of 4.63 and can be seen with the naked eye, although the two components are too close together to be resolved without a telescope. With an annual parallax shift of , the distance to this system can be estimated as , give or take a 7 light-year margin of error. It is located behind the dark cloud MBM12.

The brighter member of this pair has an apparent magnitude of 5.2. At an angular separation of from the brighter component, along a position angle of , is the magnitude 5.5 companion. Both are A-type main sequence stars with a stellar classification of A2 Vs. (The 's' suffix indicates that the absorption lines in the spectrum are distinctly narrow.) In the 2009 Catalogue of Ap, HgMn and Am stars, the two stars have a classification of A3 Ti, indicating they are Ap stars with an anomalous abundance of titanium. Within the measurement margin of error, their projected rotational velocities are deemed identical at 60 km/s.

Name

This star system, along with δ Ari, ζ Ari, π Ari, and ρ³ Ari, were Al BÄ«rÅ«nÄ«'s Al Buá¹­ain (ألبطين), the dual of Al Baá¹­n, the Belly. According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Buá¹­ain were the title for five stars :δ Ari as Botein, π Ari as Al Buá¹­ain I, ρ³ Ari as Al Buá¹­ain II, ε Ari as Al Buá¹­ain III and ζ Ari as Al Buá¹­ain IV

In Chinese astronomy, Epsilon Arietis may be or may be part of Tso Kang (from Cantonese zogang, Mandarin pronunciation zuǒgēng).

References

External links

• HR 887
• Image Epsilon Arietis