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.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/624508 |
| Date | 13 January 2017 |
| Creators | Evans, A., Banerjee, D. P. K., Gehrz, R. D., Joshi, V., Ashok, N. M., Ribeiro, V. A. R. M., Darnley, M. J., Woodward, C. E., Sand, D., Marion, G. H., Diamond, T. R., Eyres, S. P. S., Wagner, R. M., Helton, L. A., Starrfield, S., Shenoy, D. P., Krautter, J., Vacca, W. D., Rushton, M. T. |
| Contributors | Univ Arizona, LBT Observ |
| Publisher | OXFORD UNIV PRESS |
| Source Sets | University of Arizona |
| Language | English |
| Detected Language | English |
| Type | Article |
| Rights | © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society |
| Relation | https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stw3334 |
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