HST FOS SPKCTROHCOPY OF THE DUSTY SMC H II REGION N88A

摘要

Kntre Ian resumes M M de la Nube Menor tie Magallanes, N88A es una pequeiia nelmlosa de especial interes porque tiene una cantidad importance de polvo asociado a ella, Present amos y dismtimos imageiie,s tomadas con la camara planetaria del 'I'rlrsmpin Ksjmnul llnlihlf HST en 1993. Tainbien obtuvimos espeetros con el espectrografo HST-FOS que muestran un espectro rico en lineas en emisirnt. La iuteiisidad de eHtas linea.s permite, detCTininar con precision las eoudieionen fi.siraM y las abundaiiciius de C, N y O en N88A. Encontramos que O/H es similar mtentras que C/H y N/H son marginalmente mayores a los valores eiicontradow en otras rej^iones 11 11 de la Nube Mc.nor de Magallancs. Damos arsumentoH en favor de ipie probableineute una fraccion importante del polvo en la. direccion de NHKA pertenezca a la nube molecular que tlio origen alas estrellas en N88A. AniotiK tlic II 11 regions of the SMC, N88A is a small nebula of special interest because there are large amounts of dust associated with it, We present and discuss H,NT WKl'C M images taken in lilSKi. H.S'7' FOS spectra were also taken that reveal a rich emission line spectrum in the UV. The emission line strengths enabled accurate derivation of physical conditions and CNO abundances in N88A. When compared with abundances of other SMC II II regions, the O/H value derived for N88A is similar, while O and N are marginally higher. We argue that probably most of the dust located between N88A and the observer belongs to the molecular cloud that gave birth to N88A and that is in the process of disruption.