Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop..263w&link_type=abstract
Spitzer Proposal ID #263
Astronomy and Astrophysics
Astrophysics
Scientific paper
Infrared (IR) observations of galactic classical novae (CN) have established the ir importance for understanding the formation of astrophysical grains, and as contributors to abundance anomalies in the interstellar medium (ISM) on local scales. Studies of abundances in nova ejecta also provide information about nucleosynthesis in the white dwarf (WD) progenitor and in the thermonuclear runaway (TNR) during a nova explosion. However, the infrared study of novae in external galaxies, such as the Magellanic Clouds (MC), is an observational challenge. We propose to obtain DDT IRS observations of the newly discovered (2005 Nov. 26.164 UT, V = 12.6) LMC nova (Liller, IAUC 8635). This opportunity affords the first investigation of an extragalactic nova with Spitzer in a system with lower metallicity. The IRS 5 to 40 micron wavelength regime contains forbidden lines from heavy elements that are useful for excitation and abundance studies. Continuum emission and broad features at these wavelengths provide information about dust. The determination of the elemental abundances from a CN is of extreme importance in understanding the evolution of the nova explosion and chemical evolution of the ISM. Our proposed Spitzer (+IRS) DDT observations of nova LMC 2005, combined with complementary ground-based and spacecraft data (Swift) will enable determination of abundances in the ejecta in a Magellanic Cloud nova (lower metallicty system). Such determinations are rare for extragalactic events.
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