Equatorial Inner Ring of SN 1987A

Details Equatorial Inner Ring of SN 1987A Equatorial Inner Ring of SN 1987A

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...9e..40l&link_type=abstract

Supernovae: One Millennium After SN1006, 26th meeting of the IAU, Joint Discussion 9, 17-18 August 2006, Prague, Czech Republic,

Computer Science

Scientific paper

Spectral images of SN 1987A and its inner ring were obtained on 1997 December 9 (day 3972) with the Space Telescope Imaging Spectrograph (STIS) of the Hubble Space Telescope (HST). Two dimensional Gaussian-profiled ellipse model was used to obtain accurate measurement of the geometry of the inner ring. In [O II] The length of semi-major and semi-minor were determined to be 837mas and 613mas respectively, and the inclination angle was 42.9 deg. In order to improve the goodness of fit of the Gaussian-profiled model, several modifications of the model were discussed. The azimuthal flux distribution of the ring, including the inner and outer sides of the ring, was calculated. The analysis of the azimuthal flux distribution of the inner and outer sides of the ring showed some varieties on the ring. Simulations of the 500full1 models were also carried out, and comparison of the simulation results and observation data revealed the density of the ring to be 3500 cm ^-3 , with abundance ratio of He /H = 0.15, N/C = 4.5, and N/O = 1.3. No substantial difference in azimuthal profile of the ring has been found.

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