Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...308l..63g&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 308, Sept. 15, 1986, p. L63-L66. Research supported
Astronomy and Astrophysics
Astrophysics
30
Cosmochemistry, Infrared Spectra, Novae, Silicates, Stellar Mass Ejection, Stellar Spectrophotometry, Abundance, Binary Stars, Spectral Resolution, Stellar Composition, Stellar Evolution, White Dwarf Stars
Scientific paper
Infrared photometry of Nova Vulpeculae 1984 number 2 (NV2) from 2.3 to 19.5 microns during May 14, 1985 to March 31, 1986 shows that silicate grains had condensed and grown in the nova ejecta by August 23, 1985, 240 days after the eruption. A relative overabundance of oxygen in the nova shell seems indicated. Forbidden 12.8-micron Ne II forbidden line emission was a factor of about 41 above the continuum at a spectral resolution of 67 on day 240; the line persisted through day 461. The anomalous chemical composition of NV2's ejecta supports recent suggestions that ONeMg white dwarfs (evolved from 8-12 solar-mass progenitor stars) are accreting matter in binary systems.
Bentley Alan F.
Gehrz Robert D.
Grasdalen Gary L.
Greenhouse Matt
Hackwell John A.
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