New stars Spectroscopy

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Projets Spectroscopie

"new stars" spectra

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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(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

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