A Conversation for Mnemonics and Other Learning Devices


Post 1

The Researcher formally known as Dr St Justin

Astronomers like to be able to classify smiley - stars. The usual method is to plot a graph of the smiley - stars [absolute] magnitude (how bright it would be from a distance of 10 parsecs) against its temperature. The resulting graph is known as a Hertzsprung-Russell Diagram.

The majority of stars lie in a slightly wavy band, which runs from the top left of the graph to the bottom right. Using this as a guide, astronomers can predict the magnitude [temperature] of a star, given its temperature [magnitude].

However, the boffins like to classify things a bit more - the stars also belong to various Spectral Classes (related to the temperature). The main classes just have letter names - OBAFGKM. These are subdivided into tenths, with a numerical suffix to the letter (eg F6). But how do you remember the letters?

'Oh be a fine girl [guy], kiss me'!

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