Cepheid Masses: U Aql {Cycle 12 continuation of 9146}

Details Cepheid Masses: U Aql {Cycle 12 continuation of 9146} Cepheid Masses: U Aql {Cycle 12 continuation of 9146}

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9967e&link_type=abstract

HST Proposal ID #9967

Computer Science

Hst Proposal Id #9967 Cold Stars

Scientific paper

Quantitative understanding of classical Cepheids provides confidence in their use as primary extragalactic distance indicators, as well as in the understanding of the evolution of more massive stars and more evolved stars. HST UV spectroscopy provides a unique opportunity to contribute to the dramatic improvement in the precision of fundamental stellar parameters by determining the mass of the binary Cepheid U Aql, a high-priority Cepheid mass. In this project, the orbital velocity amplitude of the hot main sequence companion is to be measured from STIS echelle spectra and combined with the orbital velocity amplitude of the Cepheid from the ground-based orbit and the mass of the main sequence companion to provide the Cepheid mass. The sensitivity of the STIS spectrograph makes possible a higher dispersion observation over a wider wavelength region than the previous GHRS medium resolution spectra. We expect the radial velocities measured from the STIS spectra to reduce the uncertainty {s.d.} in the mass of U Aql from 13% {in the previous GHRS result} to < 5%.

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