Improving proper motion measurements of the stars in the field of SN 1572 with WFPC2

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We propose to complete the spatial velocity measurements of the stars in the central region of the remnant of SN 1572, one of the historical Galactic Type Ia supernovae. A new visit with WFPC2 would allow us to significantly improve the accuracy of the proper motion measurements of the stars in the field, since we would benefit from a long temporal baseline by using the WFPC2 images previously taken. This unique legacy would complement the high-precision ground-based observations made for the stars in the SN 1572 field during the past ten years. The search for the companion star of Galactic Type Ia supernovae, based on their high peculiar velocity as a salient feature, has already pointed to a good candidate for SN 1572. The current uncertainties in the tangential velocity of the candidate star and the other stars in the field can be reduced to less than a half with a visit in Cycle 16. This would lead to a precise determination of the parameters of the binary system that gave rise to the supernova. If not done during Cycle 16, the long temporal baseline for SN 1572 with WFPC2 would be lost.;

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