SIMBAD references

Using new optical, UV and X-ray observations we show that the K5 III star HR 4289, formerly believed to be the only ROSAT All-Sky survey detection to the right of the coronal diving line, should not be identified with the X-ray source. Pointed ROSAT PSPC observations demonstrate that the X-ray source is slightly extended, and locate the X-ray source 30" northwest of HR 4289 at the position of a hitherto unknown 15nag galaxy. The X-ray spectrum can well be fitted with a Raymond-Smith model for a thermal plasma at 6(±2)x10⁶K and a hydrogen column density of N_H=3(±2)x10²¹cm^–2. At a distance of z=0.016 (96 h₅₀^–1Mpc), the galaxy has an X-ray luminosity of L_x=1.4x10⁴²h₅₀^–2erg/s between 0.1 and 2.4keV.