Computer Science
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002em%26p...90...89m&link_type=abstract
Earth, Moon, and Planets, v. 90, Issue 1, p. 89-97 (2002).
Computer Science
1
C/1995 O1 (Hale-Bopp), Comets, Fabry-Pérot Spectrometers, Hydrogen Balmer-Α Coma, Line Widths, Photolytic Heating
Scientific paper
We present hydrogen Balmer-α spectra of comet C/1995 O1 (Hale-Bopp) recorded on 5 nights from 1997 February 1 to April 19 by a high-resolution (Δ v = 5 km s-1) Fabry-Pérot spectrometer for a 4'.1 (~2.7 × 105 km) FOV centered 5' sunward of the nucleus. The Hα line profile is an important diagnostic of photolytic heating in cometary atmospheres. Extraction of the spectra from the Fabry-Pérot ring images was complicated by obscuration of the telescope FOV due to Hale-Bopp's low elevation, but the measured H-α line widths of 11-13 km s-1 (FWHM) are insensitive to the spectral extraction technique. The line widths are consistent with estimates derived from a successful model of Hale-Bopp's hydrogen Lyman-α coma assuming the inner coma is opaque to Hα. We discuss methods for improving the spectral extraction technique and deriving a precise instrument profile which will allow the detailed shape of the line profile to constrain coma models.
Doane Nathaniel E.
Harris Walter M.
Morgenthaler Jeffrey P.
Oliversen Ronald James
Scherb Frank
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