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23 April 2024

» arxiv » 1512.9371

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Parallax of Galactic Cepheids from Spatially Scanning the Wide Field Camera 3 on the Hubble Space Telescope: The Case of SS Canis Majoris
Stefano Casertano ; Adam G. Riess Jay Anderson ; Richard I. Anderson ; J. Bradley Bowers ; Kelsey I. Clubb ; Aviv R. Cukierman ; Alexei V. Filippenko ; Melissa L. Graham ; John W. MacKenty ; Carl Melis ; Brad E. Tucker ; Gautam Upadhya ;
Date:	29 Dec 2015
Abstract:	We present a high-precision measurement of the parallax for the 12-day Cepheid SS Canis Majoris, obtained via spatial scanning with the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST). Spatial scanning enables astrometric measurements with a precision of 20-40 muas, an order of magnitude better than pointed observations. SS CMa is the second Cepheid targeted for parallax measurement with HST, and is the first of a sample of eighteen long-period >~ 10 days) Cepheids selected in order to improve the calibration of their period-luminosity relation and eventually permit a determination of the Hubble constant H_0 to better than 2%. The parallax of SS CMa is found to be 348 +/- 38 muas, corresponding to a distance of 2.9 +/- 0.3 kpc. We also present a refinement of the static geometric distortion of WFC3 obtained using spatial scanning observations of calibration fields, with a typical magnitude <~0.01 pixels on scales of 100 pixels.
Source:	arXiv, 1512.9371
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