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Tales from the Nova Atlas: Dust, He II, and Three Unusual Novae

Event Details

Event Dates: 

Friday, October 11, 2013 - 12:00pm

Seminar Location: 

  • CASA Conference Room C324

Speaker Name(s): 

Fred Walter

Speaker Affiliation(s): 

SUNY-Stony Brook
Seminar Type/Subject

Scientific Seminar Type: 

  • Astrophysics Lunch Seminar

Event Details & Abstract: 

The galactic novae are thermonuclear explosions in a degenerate hydrogen layer on the surfaces of white dwarf stars. After 10 years, The Stony Brook/SMARTS Atlas of (mostly) Southern Novae now includes spectra and photometry of over 70 novae. After a short justification for investing so much effort in this atlas, I will highlight 5 topics:- a more complete assay of dust formation in novae, based on optical and near-IR photometry. - musings on Bowen fluorescence and He II 4686 emission in the He-N (recurrent) novae, its relation to the supersoft X-ray emission, and possible use as a probe of the interior of the nova envelope. - interpretation of V1280 Sco (N Sco 2007), the nova that refuses to die, as a slow merger event with a cool chromosphere. - analysis of time-resolved spectra of NR TrA (N TrA 2008), which has evolved from a classical Fe II nova into a V Sge star with strong permitted emission lines of C IV, N V, and O VI. - And a presentation of the early evolution of Nova Del 2013, the brightest nova since 2007, based on high resolution (R=80,000) spectra with the Chiron spectrograph.