Circumstellar Nebular Lines in the Optical Spectrum of SN 1987A
نویسندگان
چکیده
منابع مشابه
SN Shock Evolution in the Circumstellar Medium surrounding SN 1987A
We study the structure of the circumstellar medium surrounding SN 1987A in the equatorial plane. Furthermore, we study the evolution of the SN shock within this medium during the first 25 years, and the resulting hard X-ray and radio emission from the remnant.
متن کاملThe Three-dimensional Circumstellar Environment of Sn 1987a
Surrounding SN 1987A is a three-ring nebula attributed to interacting stellar winds, yet no model has successfully reproduced this system. Fortunately, the progenitor’s mass-loss history can be reconstructed using light echoes, in which scattered light from the supernova traces the three-dimensional morphology of its circumstellar dust. In this paper, we construct and analyze the most complete ...
متن کاملA New View of the Circumstellar Environment of Sn 1987a
We summarize the analysis of a uniform set of both previously-known and newly-discovered scattered-light echoes, detected within 30 of SN 1987A in ten years of optical imaging, and with which we have constructed the most complete three-dimensional model of the progenitor’s circumstellar environment. Surrounding the SN is a richly-structured bipolar nebula. An outer, double-lobed “peanut,” which...
متن کاملThe Evolution of Ultraviolet Emission Lines From Circumstellar Material Surrounding SN 1987A
The presence of narrow high-temperature emission lines from nitrogen-rich gas close to SN 1987A has been a principal observational constraint on the evolutionary status of the supernova’s progenitor. A new analysis of the complete five-year set of low and high resolution IUE ultraviolet spectra of SN 1987A (1987.2–1992.3) provide fluxes for the N Vλ1240, N IV]λ1486, He IIλ1640, O III]λ1665, N I...
متن کاملPolarization of SN 1987A Revisited
The conventional picture for the origin of the polarization of a supernova is based on a model of Thomson or resonance scattering of photons traveling through an aspherical supernova atmosphere. Positive detection of intrinsic polarization in SN 1987A is then interpretated as evidence of an asymmetrical supernova atmosphere. We show here a di erent view based on the scattering of the supernova ...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1993
ISSN: 0074-1809
DOI: 10.1017/s0074180900171992