On the Raman O VI and related lines in classical novae

Steven N. Shore, Ivan De Gennaro Aquino, Simone Scaringi, Hans Van Winckel

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We critically examine the recent claimed detection of Raman-scattered O VI at around 6830 Å in the iron curtain stage spectra of the classical CO nova V339 Del. The observed line variations are compatible in the profile and timing of emission line strength with an excited state transition of neutral carbon. Line formation in classical nova ejecta is physically very different from what it is in symbiotic binaries, in which the O VI emission line is formed within the wind of the companion red giant at low differential velocity. The ejecta velocity and density structure prevent the scattering from producing analogous features. High velocity gradient outflows, such as winds, are subject to the same constraints. There might, however, be a broadband spectropolarimetric signature of the Raman process and also Rayleigh scattering at some stage in the expansion. We show that the neutral carbon spectrum, hitherto underexploited for novae, is especially useful as a probe of the structure of the ejecta during the early, optically thick stages of the expansion.

Original languageEnglish
Article numberL4
JournalAstronomy and Astrophysics
Volume570
DOIs
StatePublished - Oct 1 2014

Keywords

  • Atomic processes
  • Novae, cataclysmic variables
  • Radiation mechanisms: general
  • Stars: winds, outflows

Fingerprint Dive into the research topics of 'On the Raman O VI and related lines in classical novae'. Together they form a unique fingerprint.

Cite this