Hopkins Ultraviolet Telescope Observations of Nova Circini 1995 and Nova Aquilae 1995

Details Hopkins Ultraviolet Telescope Observations of Nova Circini 1995 and Nova Aquilae 1995 Hopkins Ultraviolet Telescope Observations of Nova Circini 1995 and Nova Aquilae 1995

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.2006g&link_type=abstract

American Astronomical Society, 186th AAS Meeting, #20.06; Bulletin of the American Astronomical Society, Vol. 27, p.835

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We observed Nova Cir 1995 and Nova Aql 1995 with the Hopkins Ultraviolet Telescope during the Astro-2 shuttle mission in 1995 March. The spectra provide coverage from 840 Angstroms to 1860 Angstroms with a spectral resolution of about 3 Angstroms, extending, for the first time, the ultraviolet wavelength coverage of novae to the region between Lyalpha and the Lyman limit. These far-ultraviolet observations show strong, broad, nebular emission lines from carbon, nitrogen, and oxygen, as well as a weak continuum. The Nova Cir observation shows strong C {IV} lambda1549 emission, with a total flux of about 10(-10) ergs cm(-2) s(-1) Angstroms(-1) , as well as N {IV}] lambda1486 , N {III}] lambda1750 , C {II} lambda1335 , N {V} lambda1240 , O {IV}] lambda1403 , O {III}] lambda1665 , He {II} lambda1640 , He {II} lambda1085 , C {III} lambda1176 , and C {III} lambda977 . The observed continuum is below 5times 10(-13) ergs cm(-2) s(-1) Angstroms(-1) . Nova Aql, which Sun constraints have prevented IUE from observing, was observed three times during the mission. The strongest line in the observations is N {III}] lambda1750 , with a flux of about 10(-11) ergs cm(-2) s(-1) Angstroms(-1) . Also present are C {IV} lambda1549 , N {IV}] lambda1486 , N {V} lambda1240 , O {IV}] lambda1403 , O {III}] lambda1665 , C {II} lambda1335 , and He {II} lambda1640 . The continuum is below 10(-14) ergs cm(-2) s(-1) Angstroms(-1) . The flux in many of the lines, especially the higher ionization states of carbon, nitrogen, and oxygen, increases over the ten days spanned by the three observations. The He {II} lambda1640 to He {II} lambda1085 flux ratios indicate a significant amount of extinction at the shorter wavelengths, possibly an indication of dust formation in the shells of both novae. The extinction is more severe for Nova Aql. The observed emission will allow us to place constraints on the abundances of carbon, nitrogen, and oxygen in the nova shells, as well as estimate their expansion velocities. This work was supported by NASA contract NAS 5-27000 to the Johns Hopkins University.

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