Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9146e&link_type=abstract
HST Proposal ID #9146
Computer Science
Hst Proposal Id #9146 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 double mode Cepheid, Y Car, the only known double mode Cepheid in a binary, which makes it arguably the top 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. We have already reduced the uncertainty of the amplitude of the ground-based orbit of the Cepheid from +/- 0.8 km sec^-1 to 0.2 km sec^-1. 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 Y Car from 32 % {in the previous GHRS result} to < 5%.
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