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Table 1

List of the observed objects, with some additional basic information taken from Izotov & Thuan (2004; HS 0128+2832), Pustilnik et al. (2004; HS 0837+4717) and Izotov & Thuan (1998; Mrk 930).

Object ID Other names RA (2000) δ (2000) D(Mpc) Redshift log  F(Hα) 12 + log (O/H) log(N/O)

HS 0128+2832 01h31m21.3s +28d48m12s 63.1 0.016130 –13.23 8.12  ±  0.05 –1.23  ±  0.14
HS 0837+4717 SHOC 220 08h40m29.9s +47d07m10s 166.0 0.041950 –13.06 7.62  ±  0.06 -0.75  ±  0.20
Mrk 930 23h31m58.3s +28d56m50s 83.2 0.018296 –12.71 8.07  ±  0.03 –1.42  ±  0.10

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