Celestia Forums

This is an addon for the triple star system EBLM J0555-57 (EBLM J0555-57Aa, EBLM J0555-57Ab, EBLM J0555-57B), whose Ab component is the smallest known star.

All three stars (zoomed in from big distance, the distance between the A star sub-system and the B star is atually much greater)

Star Aa and Ab

Star B


Update 1.1: Fixed the spectral type of Ab from F8 to M + added the other catalog designations

Why is EBLM J0555-57 Ab defined as an F-type star instead of an M-type star?

The Wikipedia page of EBLM_J0555-57 says "Spectral Type: F8" for EBLM J0555-57A, so I took that value for both A stars (Aa and Ab). The characteristics section of the table only has temperature values for Aa and B, but not Ab, so I chose F8. I also noticed F8 for such a small star is too hot, but yeah.

Update/fix available in original post.

I just noticed this star actually isn't the smallest known one, stars like Sirius B or neutron stars are even smaller ...

well Wikipedia says "EBLM J0555-57Ab, the smallest star in the system, orbits its primary star with a period of 7.8 days, and at the time of discovery, was the smallest known star with a mass sufficient to enable the fusion of hydrogen in its core."
so it's not the smallest star, but it is one of the smallest stars that is able to fuse hydrogen in its core