SIMBAD references

We report on observations of the X-ray pulsar 4U 1626-67 by the LECS instrument on-board BeppoSAX. We confirm the recent ASCA discovery of excess emission near 1keV (Angelini et al. 1995ApJ...449L..41A). The pulse period of 7.66794±0.00004s indicates that the source continues to spin-down. The phase averaged spectrum is well fit by an absorbed power-law of photon index 0.61±0.02 and a blackbody of temperature 0.33±0.02keV, together with an emission feature at 1.05±0.02keV. This spectral shape is similar to that observed by ASCA during the spin-down phase, but significantly different from measurements during spin-up. This suggests that the change in spectrum observed by ASCA may be a stable feature during spin-down intervals. The source intensity is a factor ∼2 lower than observed by ASCA three years earlier, confirming that 4U 1626-67 continues to become fainter with time.