Nova LMC (Large Magellanic Cloud) 1990 no. 1: The first extragalactic neon nova

摘要

IUE observations of Nova LMC 1990 No. 1, the first neon (or ONeMg) nova observed outside the Galaxy, were obtained from 17 January 1990 through March 1990, with especially dense coverage during the first 25 days of the outburst. (The neon nova categorization is based on the detection of forbidden Ne III-V lines in optical spectra; the ultraviolet neon lines were not detected.) During the first 30 days of the outburst, the radiative losses were dominated by the N V wavelength 1240 and C IV wavelength 1550 lines. The maximum ejection velocity was approximately 8000 km/s, based on the blue absorption edge of the C IV P-Cygni profile. Early in the outburst of Nova LMC 1990 No. 1 the UV luminosity alone was approximately 3 x 10(exp 38) erg/sec, implying that the bolometric luminosity was well in excess of the Eddington luminosity for a one solar mass object.