Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aj....122.2013l&link_type=abstract
The Astronomical Journal, Volume 122, Issue 4, pp. 2013-2016.
Astronomy and Astrophysics
Astronomy
12
Infrared Radiation, Stars: Novae, Cataclysmic Variables, Stars: Coronae, Techniques: Spectroscopic
Scientific paper
The 0.8-2.4 μm spectroscopy of the moderately fast Nova Sgr 1998=V4633 Sgr, obtained approximately 525 and 850 days after peak brightness, revealed an expanding, hydrogen-deficient shell of medium excitation level that increased with time. The strongest lines were He I and He II and the coronal line of [Si VI] 1.9641 μm. Also prominent were the lines of H I, and coronal [Ca VIII] 2.3205 μm and [Si VII] 2.4807 μm. Other lines included the [S III] lines at 0.9069 and 0.9532 μm and the coronal lines of [Al IX] 2.0444 μm and [Ti VI] 1.7155 μm. Five lines that frequently appear in novae spectra remain unidentified: 0.8926, 1.1114, 1.1900, 1.5545, and 2.1000+/-0.005 μm. All the observed lines were roughly 1800 km s-1 wide (FWHM), and no asymmetries or underlying plateaus were seen. The continuum was significantly shallower than a 1/λ4 blackbody emission (approximately stellar photosphere) and steepened with age.
Lynch David K.
Mazuk Stephan
Puetter Richard C.
Rudy Richard J.
Venturini Catherine C.
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