Neutral sodium from comet Hale-Bopp: a third type of tail

  title={Neutral sodium from comet Hale-Bopp: a third type of tail},
  author={G.Cremonese and H.Boehnhardt and J.Crovisier and A.Fitzsimmons and M.Fulle and J.Licandro and D.Pollacco and H.Rauer and G.P.Tozzi and R.M.West},
W e report on the discovery and analysis ofa striking neutralsodium gas tailassociated with com et C/1995 O 1 H ale-Bopp. Sodium D {line em ission has been observed atheliocentric distance r (cid:20) 1 : 4 AU in som e long{period com ets and the presence ofneutralsodium in the tailward direction ofa few brightcom ets hasbeen noted,butthe extent,and in particular the source,has never been clear. H ere we describe the (cid:12)rstobservations and analysis ofa neutral sodium gas tailin com etH ale… 

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