V1309 Sco Nova Scorpii 2008 Elena Mason, Robert Williams, Marcus Diaz ESO-Chile STCI IAG University of Sao Paulo.

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Presentation transcript:

V1309 Sco Nova Scorpii 2008 Elena Mason, Robert Williams, Marcus Diaz ESO-Chile STCI IAG University of Sao Paulo

The FEROS nova survey Jun 2003-Feb 2006 (ESO periods 71-76): 14 CNe; 2-12 epochs per object; La Silla 2.2+FEROS: λ-range ~ nm; R~48000 [Williams et al. 2008, ApJ, 685, 451]

The THEA (Transient Heavy Elements Absorption) system

s-elements (Fe, Ti, Sc, V, Cr, Y, Sr, Zr) low velocities (~500 km/s) low dispersion velocities ( km/s) disappear ~1 month after the nova outburst are external to the CN expanding ejecta

[Williams et al. 2008, ApJ, 685, 451]

Discovery of V1309 Sco narrow H emission lines (FWHM~670 & 300 km/s) absorption lines no P-Cyg absorption SOAR spectrum at Cerro Pochon: red continuum and colors: B=9.2 V=7.8 R=7.3 mag pre-outburst mag ~14.8

ESO DDT at UT2+UVES dic & dic  3000 – A slit 0.7” & 1.0”  R~70000 – epochs (Sep 13 to Oct 20)

__V1309 Sco __ Nova LMC 2005

singly ionized s-elements + FeI, CrI, … low velocity (~-50 km/s with respect to systemic) low dispersion velocities (FWHM~30 km/s)

V1309 Sco: __ epoch 1 __ epoch 5

__ epoch 1, __ epoch 5 __ FeII (49) & FeI (15)5497.5

FeII (41) (46) (40) & (74)

Balmer emission lines evolution

The Balmer lines: double peaked profile …absorption + emission narrow: emission ~140 km/s absorption ~ 70 km/s small relative velocity with respect to systemic (~50 km/s) “burst” at late epochs

Spectroscopic characteristics - summary: Absorption phase spectra (epochs 1-3): Enormous amount of abs. lines from FeI, FeII, TiII, VII, ScII, SrII, YII, CrI, CrII, CaI, MnI and MgI strong & narrow H Balmer in emission with complex profiles continuum possibly consistent with a K type star Emission line phase spectra (epochs 4 & 5): FeII, FeI, TiII etc. absorption lines now in emission He I, OI, NI, [OI] stronger H Balmer lines (by a factor up to a few 100s) fainter but redder continuum + [CaII] emission at 7291 & 7323 A

What is it? not a “classical” CN (spc. evolution & line velocities) not an AGB or post-AGB (outburst amplitude) not a symbiotic (giant at 13kpc toward the GC?) not a born again AGB (spc evolution …) cooler continuum s-element absorption red nova (V838 Mon, V4332 Sgr …type) narrow H emission ? planet/stellar merging (Retter & Marom ‘03, Tylenda & Soker ‘06) K Wolf Rayet “outburst” (Munari et al. ‘05) CN on a low mass WD (Iben & Tutukov ‘92)

but …? V1309 Sco: H + low & high ionization element emission lines A~7 mag how is it evolving? red novae: Just Balmer emission lines emission which soon “turned off” A ≥ 9-10 mag

failed nova

HeI profiles (multiplets 48, 4, 11, 46 & 10):

[OI](1) & [CaII](1):

CaI & NaI evolution