Raman-scattered He II line in the planetary nebula M2-9 and in the symbiotic stars RR telescopii and He 2-106

Hee Won Lee, Yong Woo Kang, Yong Ik Byun

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

In this Letter, we report the detection of an emission feature at around 6545 Å in the spectra of the bipolar planetary nebula M2-9 and the symbiotic stars RR Telescopii and He 2-106 and propose to identify it as the He II Raman-scattered feature. This feature was predicted by Nussbaumer, Schmid, & Vogel, who suggested that it was formed through Raman scattering by atomic hydrogen of He II n = 6 → n = 2 photons with a slightly shorter wavelength than that of Ly/β. The scattering cross section, ∼10-20 cm-2 for this process, implies the existence of a neutral hydrogen component with a column density NH1 ∼ 1020 cm-2 around the He II emission regions in these objects, which are believed to be associated with the mass-loss process in the late stage of stellar evolution. Brief discussions on the astrophysical implications of Raman scattering in these objects are presented.

Original languageEnglish
Pages (from-to)L121-L124
JournalAstrophysical Journal
Volume551
Issue number1 PART 2
DOIs
Publication statusPublished - 2001 Apr 10

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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