Cepheid variable stars are fundamental to the calibration of the extragalactic distance scale. We present radial velocities, preliminary metallicities, and preliminary surface brightness distances of Cepheids in Local Group galaxies M31 and M33 using data obtained with the High Resolution Spectrograph on the Hobby-Eberly Telescope at McDonald Observatory. These data are the first step toward surface brightness distance measurements and metallicity calibrations of these extragalactic Cepheids.
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Lowell Observ, 1400 W Mars Hill Rd, Flagstaff, AZ 86001 USA
No Arizona Univ, Dept Astron & Planetary Sci, Flagstaff, AZ 86011 USALowell Observ, 1400 W Mars Hill Rd, Flagstaff, AZ 86001 USA
Massey, Philip
Neugent, Kathryn F.
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Lowell Observ, 1400 W Mars Hill Rd, Flagstaff, AZ 86001 USA
Univ Washington, Dept Astron, Seattle, WA 98195 USALowell Observ, 1400 W Mars Hill Rd, Flagstaff, AZ 86001 USA
Neugent, Kathryn F.
Levesque, Emily M.
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Univ Washington, Dept Astron, Seattle, WA 98195 USALowell Observ, 1400 W Mars Hill Rd, Flagstaff, AZ 86001 USA
Levesque, Emily M.
Drout, Maria R.
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Univ Toronto, David A Dunlap Dept Astron & Astrophys, 50 St George St, Toronto, ON M5S 3H4, Canada
Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 USALowell Observ, 1400 W Mars Hill Rd, Flagstaff, AZ 86001 USA
Drout, Maria R.
Courteau, Stephane
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Queens Univ, Dept Phys Engn Phys & Astron, Kingston, ON K7L 3N6, CanadaLowell Observ, 1400 W Mars Hill Rd, Flagstaff, AZ 86001 USA