view Abstract Citations (32) References (13) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spectroscopic Evidence for Inhomogeneities in the Ejecta of the Type Ib Supernova 1985F Filippenko, Alexei V. ; Sargent, Wallace L. W. Abstract A moderate-resolution spectrum of the Type Ib supernova 1985F in NGC 4618, obtained 8.5 months past maximum brightness, reveals small-scale irregularities (FWHM ~ 100-250 km s^-1^; relative amplitude ~ 20%-10%) in the profile of the broad blend of [O I] λ6300 and [O I] λ6364. These same features are also visible 4 months later, but they are ~ 40% narrower and ~20% stronger than in the first spectrum. Small-scale fluctuations have previously been seen in the [O I] profiles of SN 1987A at a comparable time past maximum. One likely interpretation is that high-density clumps (σp/p >~ 0.1) surrounded by regions of lower density are beginning to forn in the ejecta. If such inhomogeneities continue to grow, as suggested by the SN 1985F data, then the 0.5 ms pulsar in SN 1987A may have been detected at a time when our line of sight intersected an unusually continuous aries of "holes" between the clumps. It is also shown that the profile of Mg I] λ4571 is significantly different from that of [O I] λ6300, implying that the mixing within the ejecta is incomplete. Publication: The Astrophysical Journal Pub Date: October 1989 DOI: 10.1086/185548 Bibcode: 1989ApJ...345L..43F Keywords: Astronomical Spectroscopy; Stellar Mass Ejection; Supernovae; Light Curve; Line Spectra; Stellar Spectra; Astrophysics; GALAXIES: INDIVIDUAL NGC NUMBER: NGC 4618; LINE PROFILES; STARS: INDIVIDUAL ALPHANUMERIC: SN 1985F; STARS: SUPERNOVAE full text sources ADS | data products NED (4) SIMBAD (3)
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