Which Variable Star Has the Longest Period?

[mishima]

Hi, what is the name of the variable star with the longest period? I know Mira variables are in general the longest, but which particular star has the longest period? Thanks.

 

[CygnusX-1]

Off the top of my head, I will guess Epsilon Aurigae. It's not a Mira, though.

 

[mishima]

Ah, sorry I meant longest period pulsating variable. One book I have gives 700 days as the upper limit for Miras, another 1000 days.

 

[mishima]

Still looking for this information...failed to find on AAVSO site.

 

[Bill_K]

https://www.eso.org/sci/publications/messenger/archive/no.24-jun81/messenger-no24-24-25.pdf mentions a star with a period of 1630 days.

 

[mishima]

Thank you sir, quite interesting. I suppose very long period variables are somewhat of a practical problem, even more so if in the infrared range.