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Radial velocities, metallicities, and distances of Cepheids in M31 and M33

Published online by Cambridge University Press:  12 April 2016

Amy D. Forestell ,
Thomas G. Barnes III ,
Christopher Sneden  and
Thomas J. Moffett
Amy D. Forestell
Affiliation:
The University of Texas at Austin, Department of Astronomy, 1 University Station, C1400, Austin, TX 78712-0259, USA
Thomas G. Barnes III
Affiliation:
The University of Texas at Austin, Department of Astronomy, 1 University Station, C1400, Austin, TX 78712-0259, USA
Christopher Sneden
Affiliation:
The University of Texas at Austin, Department of Astronomy, 1 University Station, C1400, Austin, TX 78712-0259, USA
Thomas J. Moffett
Affiliation:
Purdue University, Physics Department, 1396 Physics Bldg., West Lafayette, IN 47907-1396, USA

Abstract

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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.

Type
Part 2. What variable stars tell us about the Local Group, including the distance scale
Information
International Astronomical Union Colloquium , Volume 193: Variable Stars in the Local Group , 2004 , pp. 99 - 102
Copyright
Copyright © Astronomical Society of the Pacific 2004

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