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Table 3

Observed positions and integration times.

Source α (J2000.0) δ (J2000.0) Representative
integration time (h)
    
BD+303639 19h34m45.23s 30°30′58.90′′ 5.76
       
NGC 7027 21h07m1.59s 42°14′10.20′′ 2.56
       
NGC 6445 17h49m15.21s −20°00′34.50′′ 6.98
       
NGC 7008 21h00m34.36s 54°33′17.20′′ 4.11
       
NGC 6720 18h53m35.08s 33°01′45.03′′ 2.98
       
NGC 6720 Rim 18h53m31.90s 33°01′25.00′′ 2.98
       
NGC 6853 19h59m36.38s 22°43′15.80′′ 11.01
       
NGC 6772 19h14m36.37s −2°42′55.00′′ 6.89
       
NGC 7293 22h29m7.50s −20°48′58.60′′ 7.79
       
NGC 6781 19h18m27.42s 6°31′29.30′′ 5.43

Notes.Integration times sampled from HCN, HCO+, and HNC spectral region observations for each PN.

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