Bibcode
Kidger, Mark R.; Serra-Ricart, Miquel; Licandro, Javier; Torres, Ruth; Schulman, Leonid; Gonzalez-Perez, Jose Nicolas
Referencia bibliográfica
Astronomy and Astrophysics, v.329, p.1152-1155 (1998)
Fecha de publicación:
1
1998
Revista
Número de citas
8
Número de citas referidas
7
Descripción
Comet Hale-Bopp (1995 O1) has been intensely monitored with the 82cm
IAC-80 Telescope at Teide Observatory, Tenerife, Spain. Multicolour
photometry taken on various nights in mid-August 1995 shows that the
inner coma was redder than solar colours, with a power law spectrum of
index ~ -3.5, consistent with dust scattering. A large change in the
colour indices to a rather bluer colour and much flatter spectrum was
observed simultaneous with an increase in the brightness of the inner
coma. This occurred shortly before the August jet event was detected.
Extrapolation of the jet expansion back to the origin suggests that the
brightening and colour change may have been the initial stages of the
formation of the jet. We suggest that it was due to a change in the
scattering properties of the circumnuclear region, caused by the
ejection event of small, icy grains and/or an increment in the gas to
dust ratio. Observations taken with the IAC-80 Telescope at Teide
Observatory, Tenerife, Spain