New stars Spectroscopy

Projets Spectroscopie

"new stars" spectra

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)

Novae

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
http://www.aavso.org/publications/alerts/alert412.shtml

Type He/N Nova

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

Fast spectral evolution

KT Eri | 27-11-2009

Supernovae

Type SN I
no H lines
deep absorption 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

Line identification

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

http://ned.ipac.caltech.edu/level5/March03/Filippenko/frames.html

http://supernova.lbl.gov/~dnkasen/tutorial/

http://www.uni.edu/morgans/astro/course/Notes/section2/new9.html

http://www.astro.rug.nl/~onderwys/ACTUEELONDERZOEK/JAAR2001/rico/spectra.html

http://www.cfa.harvard.edu/supernova/RecentSN.html

http://marwww.in2p3.fr/~blondin/graphics/index.html

http://supernova.lbl.gov/~nugent/nugent_templates.html

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