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Science North Star dims for a century, suddenly gets brighter
Science North Star dims for a century, suddenly gets brighter | North Star dims for a century, suddenly gets brighter |
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| by William Atkins | |
| Wednesday, 23 July 2008 | |
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Page 3 of 3 The abstract states, “We present the analysis of 4.5 years of nearly continuous observations of the classical Cepheid Polaris, which comprise the most precise data available for this star. We have made spectroscopic measurements from ground and photometric measurements from the WIRE star tracker and the SMEI instrument on the Coriolis satellite." Featured Whitepaper
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Science DiscussionsAnd, concludes, "In addition, previous radial velocity campaigns have claimed the detection of long-period variation in Polaris (P > 40 days). Our radial velocity data are more precise than previous datasets, and we find no evidence for additional variation for periods in the range 3-50 days with an upper limit of 100 m/s. However, in the WIRE data we find evidence of variation on time-scales of 2-6 days, which we interpret as being due to granulation." |
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