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The Reionization of Unshocked Ejecta in SN1006

Published online by Cambridge University Press:  12 April 2016

A.J.S. Hamilton  and
R.A. Fesen
A.J.S. Hamilton
Affiliation:
Joint, Institute for Laboratory Astrophysics, University of Colorado and National Bureau of Standards and Center for Astrophysics and Spaoe Astronomy, University of Colorado, Boulder, Colorado 80309
R.A. Fesen
Affiliation:
Joint, Institute for Laboratory Astrophysics, University of Colorado and National Bureau of Standards and Center for Astrophysics and Spaoe Astronomy, University of Colorado, Boulder, Colorado 80309

Abstract

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The fortuitous positioning of the Schweizer and Middleditch OB subdwarf behind SN1006 has permitted the detection and subsequent confirmation by IUE of broad (±5000 km/s) Fe II absorption features which probably arise from unshocked iron ejecta in the center of SN1006. The mass of detected Fe II, ∽0.012 M⊙, is however only 1/25 of the ∽0.3 M⊙ of Fe within ±5000 km/s predicted by carbon deflagration models. IR and optical observations exclude any appreciable iron in grains or Fe I, but high ion stages, Fe III and up, oould be present. Promising mechanisms for ionizing the unshocked iron in SN1006 include the radioactive decay of 44Ti, and photoionization by UV and X-ray emission from the reverse shock. Although the photoionization model works, insofar as it permits as much as 0.2 M⊙ of unshocked iron in the center of SN1006, agreement with the IUE data requires that the ejecta density profile be flatter, less centrally concentrated, than the W7 deflagration model of Nomoto, Thielemann, and Yokoi.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 101: Supernova Remnants and the Interstellar Medium , 1988 , pp. 59 - 63
Copyright
Copyright © Cambridge University Press 1988

References

Fesen, R.A., Wu, C.-C., Leventhal, M., and Hamilton, A.J.S. 1987 Ap. J., submitted.Google Scholar
Nomoto, K., Thielemann, F.-K., and Yokoi, K. 1984 Ap. J., 286, 644 Google Scholar
Schweizer, F., and Middleditch, J. 1980 Ap. J., 241, 1039.Google Scholar