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BSS 19

The globular cluster 47 Tucanae contains many millions of stars at a diameter of only 120 light-years. So it is very densily packed. Globular clusters are very old and therefore shouldn't contain stars with the mass of the Sun or above. This is because these stars don't become so old.
Nevertheless some so called blue stragglers like BSS 19 are found in them. These stars shouldn't exist because they are to heavy for their age. They formed when two stars collided and melted to a new and bigger star.

Constellation: Tucana
Age of 47 Tucanae: 13 billion years
Distance: 13 400 light-years
Spectral class: A7
Luminosity: 10 - 12 * Sun
Mass: 1.7 * Sun
Radial velocity: 19 km/sec

Back: List of Special Stars part 2
    47 Tucanae
The globular cluster 47 Tucanae.
Photo: The Two Micron All Sky Survey at IPAC

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