Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...432..349l&link_type=abstract
Astronomy and Astrophysics, Volume 432, Issue 1, March II 2005, pp.349-354
Astronomy and Astrophysics
Astrophysics
10
Minor Planets, Asteroids
Scientific paper
We have used the 3.5 m New Technology Telescope at ESO, La Silla, to obtain spectra of 18 asteroids belonging to the Cybele group. One additional Cybele asteroid was observed with the ESO 3.6 m telescope. From the spectra we have derived spectral slopes and taxonomy classifications. Our observations show that spectrally red D-type Cybeles tend to be smaller than more spectrally neutral P- and C-type objects from this group. Similar colour-diameter trends have previously been reported for other outer belt low albedo asteroids (Hildas and Trojans). We discuss possible reasons for this trend. In particular, the observed dominance of red objects for small diameters is consistent with a space weathering scenario, where irradiation of asteroid regoliths with solar wind plasma neutralizes their surface colours due to carbonization of originally reddish organic components. Collisional disruption of such large greyish "aged" P-type objects would produce a number of redder D-type fragments lacking mature regoliths. In addition, the observed colour-diameter trend may be due to compositional differences between D-, P- and C-type asteroids. P- and C-types may be lacking at small diameters, since their materials are less susceptible to collisional break-up than spectrally red D-type material. A simultaneous contribution of both factors (compositional differences and space weathering) to the observed trend is possible as well.
Observations were made at the European Southern Observatory (ESO) with the NTT telescope under program 56.F-0355 and the 3.6 m telescope under program 62.S-0133.
Dahlgren Mats
Erikson Anders
Karlsson O.
Lagerkvist Claes-Ingvar
Lahulla Felix
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