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Projets Spectroscopie

"new stars" spectra


Retour Accueil




Main features for "new" stars spectroscopic identification near maximum light


Dwarf Novae




WZ Sge type

Intense blue continuum
Balmer lines weak in absorption or emission - sometimes : weak emission component in the absorption component






VSX J213806.5+261957 | 15-05-2010
(note the emission component in H béta absorption)



Type Fe Nova

Narrow lines < 2500 km.s-1
Fe lines especially multiplet 42
Frequent P Cygni absorption profile

Slow evolution (weeks)


V496 Sct | 09-11-2009



Type He/N Nova

Broad lines > 2500 km.s-1
N and He lines

Fast spectral evolution





KT Eri | 27-11-2009




Type SN I
no H lines
deep absorption(SiII) at 6150 angtröms







SN 2011by in NGC3972 |12-05-5011
Type Ia


Type SN II
H lines present








SN2011dh in M51 | 16-06-2011
Type IIb





Comparison between Type I and II supernovae


Supernovae lines identification  



Classification of supernovae
Turatto, 2003 : http://arxiv.org/abs/astro-ph/0301107










On novae spectral evolution : http://www.astronomie-amateur.fr/Projets%20Spectro4%20Novae.html (in french)

Further readings, with many spectra :

The formation of novae spectra
R.E. Williams
A.J., Vol. 104, Number 2, 1992

The evolution and classification of postoutburst novae spectra
R.E. Williams & al.
A.J., 376:721-737, 1991

The Tololo nova survey : spectra of recent novae
R.E. Williams, M.M. Phillips, M. Hamuy
A.J. supp. ser., 90:297-316, 1994