Abstract
We present infrared spectroscopy of the classical nova V339 Del, obtained over an similar to 2-yr period. The infrared emission lines were initially symmetrical, with half width half-maximum velocities of 525 km s(-1). In later (t greater than or similar to 77 d, where t is the time from outburst) spectra, however, the lines displayed a distinct asymmetry, with a much stronger blue wing, possibly due to obscuration of the receding component by dust. Dust formation commenced at approximately day 34.75 at a condensation temperature of 1480 +/- 20 K, consistent with graphitic carbon. Thereafter, the dust temperature declined with time as T-d alpha t(-0.346), also consistent with graphitic carbon. The mass of dust initially rose, as a result of an increase in grain size and/or number, peaked at approximately day 100, and then declined precipitously. This decline was most likely caused by grain shattering due to electrostatic stress after the dust was exposed to X-radiation. The appendix summarizes Planck means for carbon and the determination of grain mass and radius for a carbon dust shell.
Original language | English |
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Pages (from-to) | 4221-4238 |
Number of pages | 18 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 466 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1 May 2017 |
Externally published | Yes |
Keywords
- line: profiles
- circumstellar matter
- stars: individual: V339 Del
- novae, cataclysmic variables
- infrared: stars
- RECOMBINATION-LINE-INTENSITIES
- INFRARED-SPECTROSCOPY
- CASSIOPEIAE 1993
- SPECTRAL EVOLUTION
- GRAPHITE GRAINS
- HYDROGENIC IONS
- RAY-EMISSION
- CO EMISSION
- DEL 2013
- OUTBURST