Iíve written a book called "Universal Detectives" on the history of cosmology from the merest potential microbe 4.4 billion years ago up to human knowledge at 31st March this year and am making it available on CD to those interested, however one paragraph has had to read:
1990 Changes in the Pole Star
Our Pole Star is a Cepheid Variable that astronomers believe has been pulsing for 40,000 years. It was found to pulse in 1896 and did so from then until the mid 1970s at about 5 kms in and out per second. By 1987 this had slowed to 1.5 kms per second and by 1990 to only 0.5 kms per second. At this rate of slowing it was forecast it would cease to pulse altogether by 1992. Does anyone know if it still pulses? If so, do let me know and I'll put this in the next Update of Universal Detectives.
---as I not only donít know the answer, but have been unable to find it. Perhaps one of your question-answerers knows? If so, I shall certainly acknowledge their help in my update, probably around the end of September.
Best wishes, Andy Nimmo.