36 Ursae Majoris

36 Ursae Majoris

36 Ursae Majoris is a yellowish main sequence star of spectral type F8V. The star is 1.2 times more massive than Sun and has a 1.2 times larger radius. Its age is around 2 billion years.

The star is thought to have a stellar companion B of spectral type K7V at wide separation (1500 AUs). An optical companion C (spectral type K2V) is located at 49000 AUs but it's likely not bound to the system.

Brown dwarf companions?

In 1981, a 60 Jupiter mass companion (likely a brown dwarf) was claimed to orbit around 36 Ursae Majoris in highly eccentric orbit (e=0.81) with a 18 year period (separation 6.8 AUs?). Such companion has still not been confirmed nor officially detected. Nevertheless brown dwarf companions or high mass gas giants are inferred at wide separations. Further radial velocity analysis are needed to confirm the presence of such objects.

References

* http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%40536244&Name=HD%20%2090839
* http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%40536243&Name=NLTT%2024505


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