Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6525b&link_type=abstract
HST Proposal ID #6525
Computer Science
Hst Proposal Id #6525 Hot Stars
Scientific paper
Among middle age neutron stars, Geminga is, no doubt, the beststudied. Many years of efforts aimed at the identification ofthe optical counterpart of the X/Gamma ray source yielded theI,R,V,B and more recently F555W and F342W colors of G". Whenplotted in a flux vs wavelength diagram, the colors of G" donot appear to follow completely a planckian distribution.While the F342W and B fluxes, as well as I upper limit, lie onthe extrapolation of the planckian measured by EUVE and ROSAT,the F555W, V and R appear to be well above it. In fact, theyseem to define a spectral feature superimposed on the thermalemission. This is the first observational evidence of aspectral feature on an Isolated Neutron Star and as such is inneed of confirmation. Aim of this proposal is to provide thisby better constraining the underlying planckian, measuring theflux of Geminga with filters F430W and F275W. While F275Wwould be a new piece of information, the F430W will allow across check of the difficult and uncertain B point, measuredfrom the ground to be 26.5.
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