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Observations of the QSO HE 0226-4110 (zem = 0.495) with the Cosmic OriginsSpectrograph (COS) from 1134 to 1796 {\AA} with a resolution of ~17 km s-1 andsignal-to- noise (S/N) per resolution element of 20 to 40 are used to study themulti-phase absorption system at z = 0.20701 containing O VI and Ne VIII. Thesystem was previously studied with lower S/N observations with FUSE and STIS.The COS observations provide more reliable measures of the H I and metal linespresent in the system and reveal the clear presence of broad Lyman {\alpha}(BLA) absorption with b = 72(+13, -6) km s-1 and logN(H I) = 13.87\pm0.08.Detecting BLAs associated with warm gas absorbers is crucial for determiningthe temperature, metallicity and total baryonic content of the absorbers. TheBLA is probably recording the trace amount of thermally broadened H I in thecollisionally ionized plasma with log T ~5.7 that also produces the O VI and NeVIII absorption. The total hydrogen column in the collisionally ionized gas,logN(H) ~ 20.1, exceeds that in the cooler photoionized gas in the system by afactor of ~22. The oxygen abundance in the collisionally ionized gas is [O/H] =-0.89\pm0.08\pm0.07. The absorber probably occurs in the circumgalacticenvironment (halo) of a foreground L = 0.25L* disk galaxy with an impactparameter of 109h70-1 kpc identified by Mulchaey & Chen (2009).

Cos observations of metal line and broad lyman alpha absorption in the multi-phase o vi and ne viii system toward he 02226-4110