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2001MNRAS.320...61B - Mon. Not. R. Astron. Soc., 320, 61-65 (2001/January-1)
Deep Hα imagery of the Eridanus shells.
BOUMIS P., DICKINSON C., MEABURN J., GOUDIS C.D., CHRISTOPOULOU P.E., LOPEZ J.A., BRYCE M. and REDMAN M.P.
Abstract (from CDS):
Furthermore, an upper limit of 0.13arcsec.yr–1 to the expansion proper motion of the primary 25° long nebulous arc has been obtained by comparing a recent Hα image obtained with the San Pedro Martir telescope of its filamentary edge with that on a Palomar Observatory Sky Survey E plate obtained in 1951.
It is concluded that these filamentary arcs are the superimposed images of separate shells (driven by supernova explosions and/or stellar winds) rather than the edges of a single `superbubble' stretching from Barnard's Arc (and the Orion Nebula) to these high galactic latitudes. The proper motion measurement argues against the primary Hα-emitting arc being associated with the giant radio loop (Loop 2) except in extraordinary circumstances.
Abstract Copyright: 2001, Royal Astronomical Society
Journal keyword(s): ISM: bubbles
Nomenclature: Fig.3: [BDM2001] Arc A (Nos A-B).
Simbad objects: 15
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