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News Release Archive:

News Release 693 of 949

October 29, 1997 12:00 AM (EST)

News Release Number: STScI-1997-35

Hubble Catches Up with a Blue Straggler Star

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Image: Spectrum of Blue Straggler Star in 47 Tuc

Spectrum of Blue Straggler Star in 47 Tuc

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ABOUT THIS IMAGE:

A star's light yields clues about its identity which are not revealed in an image. That's why astronomers use spectrographs to decode the light. A spectrograph disperses light into its component colors, providing information on a star's rotation velocity, temperature, and surface gravity. The spectrum above compares a computer-generated spectrum of a blue straggler star with one from the observation of the blue straggler in 47 Tucanae, taken by the Hubble Space Telescope's Faint Object Spectrograph. The model spectrum predicts the shape and depth of a blue straggler's spectral lines. Based on this comparison, the Hubble telescope observation clearly matches the model.

The Hubble spectrum was taken on Oct. 27, 1995.

Object Names: 47 Tucanae, NGC 104

Image Type: Illustration

Credit: R. Saffer (Villanova University) and NASA

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