What Can the Redshift Observed in EXO 0748–676 Tell Us?

The mass-radius relations for bare and crusted strange stars are calculated with the bag model. Comparing these relations with the observed one derived from the redshift of EXO 0748–676, we come to the conclusion that it is incorrect to say that EXO 0748–676 cannot be a strange star. Various strange star models can show that EXO 0748–676 could have a mass of (1.3 ∼ 1.7)M_☉ and a radius of (8.4 ∼ 11.4) km. It is proposed that a proportion of nascent strange stars could be bare and have masses ∼ 0.1M_☉, and their masses increased over a long period of accretion.