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High-velocity ultraviolet iron, silicon, oxygen, and sulfur absorption features associated with the remnant of SN 1006
Fesen, Robert A.; Wu, Chi-Chao; Leventhal, Marvin; Hamilton, Andrew J. S.
AA(Colorado, University, Boulder), AB(Computer Sciences Corp., Baltimore, MD), AC(AT&T Bell Laboratories, Murray Hill, NJ), AD(Joint Institute for Laboratory Astrophysics, Boulder, CO)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 327, April 1, 1988, p. 164-177. (ApJ Homepage)
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NASA/STI Keywords:
Abundance, Stellar Coronas, Stellar Spectra, Supernova Remnants, Ultraviolet Spectra, White Dwarf Stars, Iron, Iue, Oxygen, Radial Velocity, Red Shift, Silicon, Sulfur
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New low-dispersion IUE spectra of a faint sdOb star located in a direction near the center of the SN 1006 remnant are presented. The UV spectrum of the star exhibits several strong absorption features which are uncharacteristic of its optical sdOB star classification. The identification by Wu et al. (1983) of very broad absorption features at 1610, 2370, 2600 A as Fe II gas associated with the SN 1006 remnant is supported. The observed Fe II line profiles indicate a concentration of Fe(+) toward the remnant's center with a radial velocity range on the order of + or - 5000 km/s. Strong absorption lines at 1281, 1331, and 1420 A are interpreted as originating from clumps of O-, Si- and S-rich ejecta with central radial velocities in the range 5000-6500 km/s. The presence in the SN 1006 remnant of an expanding sphere of iron-rich ejecta interior to O-, Si-, and S-rich clumps of ejecta having velocities over the maximum seen for the Fe II absorbing gas is consistent with type Ia Sn observations and carbon deflagration models.

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