NUV Internal/External Wavelength Scale Monitor

Details NUV Internal/External Wavelength Scale Monitor NUV Internal/External Wavelength Scale Monitor

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11900o&link_type=abstract

HST Proposal ID #11900. Cycle 17

Computer Science

Scientific paper

This program monitors the offsets between the wavelength scale set by the internal wavecal versus that defined by absorption lines in external targets. This is accomplished by observing two external radial velocity standard targets: HD187691 with G225M and G285M and HD6655 with G285M and G230L. The two standard targets have little flux in the wavelength range covered by G185M and so Feige 48 {sdO} is observed with this grating. Both Feige 48 and HD6655 are also observed in SMOV. The cenwaves observed in this program are a subset of the ones used during Cycle 17. Observing all cenwaves would require a considerably larger number of orbits. Constraints on scheduling of each target are placed so that each target is observed once every 2-3 months. Observing the three targets every month would also require a considerably larger number of orbits.;

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