Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....45..213r&link_type=abstract
Astronomy and Astrophysics, vol. 45, no. 1, Dec. 1975, p. 213-216.
Astronomy and Astrophysics
Astrophysics
5
Far Ultraviolet Radiation, Planetary Nebulae, Stellar Spectra, Ultraviolet Photometry, Astronomical Models, Continuous Radiation, Coronas, Helium, Radiant Flux Density, Rocket-Borne Instruments, Ultraviolet Filters
Scientific paper
Results are reported for a search for EUV radiation between 140 and 430 A from selected objects which was conducted with a rocket-borne EUV filter photometer. The candidate objects included the bright planetary nebula NGC 2392 and the stars gamma Gem, alpha CMa, omicron-prime CMa, and gamma-2 Vel. Upper limits (2-sigma level) to the flux near 200 A are determined for the five objects, and estimates of the expected 200-A helium-continuum flux are derived for two of the stars on the basis of the hot-corona model. It is found that the calculated upper limits are at least two orders of magnitude higher than plausible flux estimates based on the hot-corona model. However, it is noted that uncertainties in the flux estimates are great enough to make the upper limits useful.
Garmire Gordon P.
Riegler Guenter R.
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