Stars around QSO 2237+0305.
Notes. Field stars named α and β are shown in Fig. 1 of Corrigan et al. (1991), and the γ star is the so-called star 1 in Moreau et al. (2005). RA(J2000) and Dec(J2000) are given in degrees. The gr magnitudes are taken from the Sloan Digital Sky Survey DR15 (Aguado et al. 2019), while the VRI magnitudes correspond to results in Corrigan et al. (1991) and Vakulik et al. (1997).
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