Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259..315t&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 2, p. 315-322.
Astronomy and Astrophysics
Astronomy
25
Planetary Nebulae, Stellar Spectrophotometry, Ultraviolet Spectra, White Dwarf Stars, Radial Velocity, Stellar Spectra, Ultraviolet Astronomy
Scientific paper
Optical and high-resolution ultraviolet spectra of LS V + 46 21, the postulated central star of the large, nearby planetary nebula S 216, have been analyzed. From modeling the line profiles, this star is found to have an effective temperature of about 90,000 K, surface gravity log g of about 7, and a He:H ratio of about 0.01. These are as expected from published data on the nebula, and provide confirmation that it is a planetary. The ultraviolet data reveal a spectrum rich in lines of Fe VI and Fe VII, whose excitation potentials require a photospheric origin. LS V + 46 21 is currently the brightest member of the DAO class of white dwarfs and planetaries. Low-resolution IUE SWP spectra of three others (A 7, A 31 and PW 1) have also been analyzed, two of which reveal metals. This suggests that the spectrum of LS V + 46 21 may be typical of many DAOs.
Napiwotzki Ralf
Tweedy Richard W.
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