Is the Galactic Halo Planetary Nebula PN G243−37.1 an “O vi Sequence” Variable Object?
1998; Institute of Physics; Volume: 110; Issue: 750 Linguagem: Inglês
10.1086/316209
ISSN1538-3873
Autores Tópico(s)Astrophysics and Star Formation Studies
ResumoArchival IUE spectra of the Galactic halo planetary nebula PN G243−37.1 have been reprocessed by the NEWSIPS routine. The new results show a much richer emission‐line spectrum than has previously been reported. Several C iii, C iv, O v, and possibly O vi features were detected. P Cygni line profiles could not be identified with certainty. The He ii λ1640 emission, which is the strongest line in the IUE spectrum and is likely a mixture of stellar and nebular origin, increased in intensity as did the stellar continuum level between observational epochs of 1988 and 1990, which suggests that the object is a variable planetary nebula. A very recent optical spectrum confirms the UV results and suggests that the object underwent a dramatic change, possibly as a result of an episodic mass‐loss event.
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