C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST14:27:02

2014A&A...570L...4S - Astronomy and Astrophysics, volume 570, L4-4 (2014/10-1)

On the Raman O VI and related lines in classical novae.


Abstract (from CDS):

We critically examine the recent claimed detection of Raman-scattered OVI at around 6830Å 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 OVI 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.

Abstract Copyright:

Journal keyword(s): radiation mechanisms: general - novae, cataclysmic variables - stars: winds, outflows - atomic processes

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 V* RS Oph No* 17 50 13.1592776879 -06 42 28.481553668   12.29 4.30     OB+M2ep 922 0
2 NOVA Aql 1917 No* 18 52 03.5647265171 -01 28 39.191180908           ~ 146 0
3 NOVA Del 2013 No* 20 23 30.6864752010 +20 46 03.777415270   17.50 16.86     ~ 157 0
4 EM* AS 453 Sy* 21 02 09.8173494732 +45 46 32.736335364   16.04 14.68 11.38   Mep 235 0

    Equat.    Gal    SGal    Ecl

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