On So In Comets     

Krishna Swamy  K. S.  A'hearn  M. F. 《Earth, Moon, and Planets》1999,84(2):109-113

The solution of the statistical equilibrium equations for the SO molecule is used to estimate the expected intensities of microwave lines. The observed fluxes of the microwave lines of SO in Comet Hale–Bopp require approximately 1.8 10²⁸ mol/sec which give fluxes in the A³Π - X³Σ⁻bands below the observable limit, consistent with the observations. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Infrared Observations Of Dust Emission From Comet Hale-Bopp     

Lisse  C. M.  Fernández  Y. R.  A'hearn  M. F.  Kostiuk  T.  Livengood  T. A.  Käufl  H. U.  Hoffmann  W. F.  Dayal  A.  Ressler  M. E.  Hanner  M. S.  Fazio  G. G.  Hora  J. L.  Peschke  S. B.  Grün  E.  Deutsch  L. K. 《Earth, Moon, and Planets》1997,78(1-3):251-257

We present infrared imaging and photometry of the bright, giant comet C/1995 O1 (Hale-Bopp). The comet was observed in an extended infrared and optical observing campaign in 1996–1997. The infrared morphology of the comet was observed to change from the 6 to 8 jet “porcupine” structure in 1996 to the “pinwheel” structure seen in 1997; this has implications for the position of the rotational angular momentum vector. Long term light curves taken at 11.3 μm indicate a dust production rate that varies with heliocentric distance as ∶ r^−1.4. Short term light curves taken at perihelion indicate a rotational periodicity of 11.3 hours and a projected dust outflow speed of ∶ 0.4 km s⁻¹. The spectral energy distribution of the dust on October 31, 1996 is well modeled by a mixture of 70% silicaceous and 30% carbonaceous non-porous grains, with a small particle dominated size distribution like that seen for comet P/Halley (McDonnell et al., 1991), an overall dust production rate of 2 × 10⁵ kg s⁻¹, a dust-to-gas ratio of ∶5, and an albedo of 39%. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献