IUE observations of the shells of RR PIC and GK Per

Details IUE observations of the shells of RR PIC and GK Per IUE observations of the shells of RR PIC and GK Per

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258p...7e&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 1, Sept. 1, 1992, p. 7P-13P.

Astronomy and Astrophysics

Astronomy

16

Iue, Nebulae, Novae, Ultraviolet Emission, Data Reduction, Stellar Envelopes, Ultraviolet Astronomy

Scientific paper

We present UV observations of the resolved shells of the old novae RR Pic (1925) and GK Per (1901). On the assumption that the RR Pic nebula is photoionized by the ultraviolet continuum emitted by the stellar remnant, we conclude that nitrogen is overabundant relative to solar in both the 'equatorial ring' and 'polar blob' regions; there are steep gradients in the C/O ratio, however. We find possible evidence for emission by molecular hydrogen in the 'blob'. There is some evidence for abundance gradients in the GK Per nebula, in which excitation is likely to be by shocks rather than by the weak UV emission of the stellar remnant. The existence of abundance gradients in old nova shells is consistent with the IR behavior of recent novae, and must arise during the thermonuclear runaway itself.

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