Photometry of Proxima Centauri and Barnard's Star Using Hubble Space Telescope Fine Guidance Sensor 3: A Search for Periodic Variations*

@article{Benedict1998PhotometryOP,
  title={Photometry of Proxima Centauri and Barnard's Star Using Hubble Space Telescope Fine Guidance Sensor 3: A Search for Periodic Variations*},
  author={G. Benedict and B. Mcarthur and E. Nelan and D. Story and A. Whipple and P. Shelus and W. Jefferys and P. Hemenway and O. Franz and L. Wasserman and R. L. Duncombe and W. V. Altena and L. Fredrick},
  journal={The Astronomical Journal},
  year={1998},
  volume={116},
  pages={429-439}
}
We have observed Proxima Centauri and Barnard's star with the Hubble Space Telescope Fine Guidance Sensor 3. Proxima Cen exhibits small-amplitude, periodic photometric variations. Once several sources of systematic photometric error are corrected, we obtain 2 mmag internal photometric precision. We identify two distinct behavior modes over the past 4 years: higher amplitude, longer period and smaller amplitude, shorter period. Within the errors, one period (P ~ 83 days) is twice the other… Expand
Precise Doppler Monitoring of Barnard's Star
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