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Title:
Far-Ultraviolet Absorption Lines in the Remnant of SN 1006
Authors:
Wu, Chi-Chao; Crenshaw, D. Michael; Hamilton, Andrew J. S.; Fesen, Robert A.; Leventhal, Marvin; Sarazin, Craig L.
Publication:
Astrophysical Journal Letters v.477, p.L53 (ApJL Homepage)
Publication Date:
03/1997
Origin:
APJ
ApJ Keywords:
ISM: ABUNDANCES, ISM: INDIVIDUAL ALPHANUMERIC: SN 1006, ISM: SUPERNOVA REMNANTS
DOI:
10.1086/310510
Bibliographic Code:
1997ApJ...477L..53W

Abstract

We have obtained a far-ultraviolet spectrum (1150--1600 A) of a hot subdwarf star behind the remnant of supernova 1006 with the Faint Object Spectrograph (FOS) on the Hubble Space Telescope. The high-quality spectrum is used to test previous identifications of the strong absorption features discovered with the International Ultraviolet Explorer. These features have FWHM = 4000 (+/-300) km s-1 and are not at the rest wavelengths of known interstellar lines, as opposed to the broader (~8000 km s-1 FWHM) Fe II lines from the remnant centered at 0 km s-1 in near-UV FOS spectra. We confirm that the broad absorption features are principally due to redshifted Si II, Si III, and Si IV lines, which are centered at a radial velocity of 5100 (+/-200) km s-1. The Si II lambda 1260.4 profile is asymmetric, with a nearly flat core and sharp red wing, unlike the Si II lambda 1526.7 and Si IV lambda lambda 1393.8, 1402.8 profiles. One possible explanation is additional absorption from another species. Previous work has suggested that S II lambda lambda 1250.6, 1253.8, 1259.5 at a radial velocity of ~6000 km s-1 is responsible, but this would require a sulfur-to-silicon abundance ratio that is at least a factor of 10 higher than expected. Another possible explanation is that the Si II and Si IV profiles are intrinsically different, but this does not explain the symmetric (albeit weaker) Si II lambda 1526.7 profile.
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