A variable star is one whose brightness as seen from Earth fluctuates. This variation may be caused by a change in the quantity or wavelength of the emitted light or by something partly blocking the light. Intrinsic variables are stars whose luminosity actually changes. Extrinsic variables are those stars whose apparent changes in brightness are due to changes in the amount of their light that can reach the observer. Discovering a previous unreported variable star would be the highlight of many amateur astronomers time in the hobby!
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Martin Nicholson (born 1954) was educated at St Albans School in Hertfordshire and then at Nottingham University. After a brief spell working in the food industry Martin became a college lecturer initially based in Somerset and later in Northamptonshire before retiring from the post as Director of Information Technology at Guilsborough School in 2005. Although he had a successful career as a teacher he is probably best known for the 25 years+ he served as a school governor and for the extensive work he carried out in the fields of amateur astronomy and in the twin disciplines of stamp collecting and postal history. Martin was one of the first amateur astronomers to see the potential of remote access astronomy and it is testimony to his determination that what was initially regarded with great scepticism by the astronomical establishment has now become standard practice for most serious enthusiasts. He is the discoverer of over 1,000 previously unknown double stars and variable stars that now appear in the standard catalogues.
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Paperback. Etat : new. Paperback. A variable star is one whose brightness as seen from Earth fluctuates. This variation may be caused by a change in the quantity or wavelength of the emitted light or by something partly blocking the light. Intrinsic variables are stars whose luminosity actually changes. Extrinsic variables are those stars whose apparent changes in brightness are due to changes in the amount of their light that can reach the observer. Discovering a previous unreported variable star would be the highlight of many amateur astronomers time in the hobby! Shipping may be from our Sydney, NSW warehouse or from our UK or US warehouse, depending on stock availability. N° de réf. du vendeur 9781508873341
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