**Table 3:** Comparison stars used for the differential CCD photometry of HS 0417, HS 1016, HS 1340, HS 1857, and HS 2214, see Fig. 1.
ID	USNO-A2.0	R	B
C1	1575-02009718	13.3	13.3
C2	1575-02008711	13.6	14.9
C3	1200-06495553	14.3	15.0
C4	1050-06991669	13.4	14.5
C5	1050-06992410	14.4	16.4
C6	1050-06992029	15.3	17.3
C7	1575-04072972	12.2	13.5
C8	1575-04073098	13.8	14.8
C9	1575-04073991	13.8	14.9
C10	1125-19198939	13.7	14.8
C11	1125-19199670	15.0	15.6

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