• Far infrared emission from three new planetary nebulae

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    • Keywords


      planetary nebulae, dust temperature; planetary nebulae, optical depth; planetary nebulae, far infrared flux

    • Abstract


      As dust emission in the far infrared (FIR) is a characteristic property of planetary nebulae we searched the Infrared Astronomical Satellite (IRAS) point-source catalogue for confirmatory evidence on the two new possible planetary nebulae S 68 and 248 - 5 identified by Fesen, Gull & Heckathorn (1983) and the high-excitation planetary nebula 76 + 36 detected by Sanduleak (1983). We identify the nebulae 248 - 5 and 76 + 36 with IRAS sources 07404 - 3240 and 17125 + 4919, respectively and have determined their dust temperature, total FIR emission and optical depth. We also set a lower limit ranging in value from 1.2 × 10-6 to 3.7 × 10-5 forMdust/Mbd of the nebula 248 - 5 depending on whether its grain material is silicate or graphite. S 68 could not be identified with an IRAS source.

    • Author Affiliations


      K. V. K. Iyengar1

      1. Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay - 400005
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