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Blue Straggler Stars
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Wed Nov 15 2000 at 17:26:01
Discovered in
1953
by
Allan Sandage
, Blue Stragglers, or BSSs, are known for their striking
color
and
luminosity
in otherwise
homogeneous
galactic
and
globular cluster
s. What is so
peculiar
about BSSs is that for their
temperature
, and therefore
mass
and luminosity, they should have long since evolved off of the
main sequence
, into
Red Giant
and later stages. Stars that are members of large clusters are all formed around the same time. As they age along the main sequence there line above a certain luminosity above which no stars will exist since they will have long since fused their hydrogen and helium cores and died.
Clusters are relatively barren of any gas or dust that might allow for new
star formation
and observed BSSs. While BSSs could be pollutants, field stars from outside the cluster, they tend to be
concentrated
in the core of clusters and no observed BSSs have
radial velocities
consistent with this theory.
The leading
theory
, and
observation
supports this, states that BSSs are a result of
collision
s and
mass transfer
. As unstable
binary star
systems
gravitate
towards one another, mass from the smaller star is slowly
coalesce
d with the larger star. This provides it with more fuel and disturbs other gases in the star causing new hydrogen to be introduced into the
core
. This process gives the larger star a new lease on life and more mass causes it to burn hotter and brighter.
One bright BSS and several fainter ones can be seen in this
star field
(image of Globular Cluster 47
Tucanae
): http://oposite.stsci.edu/pubinfo/PR/97/35/content/9735a.jpg
printable version
chaos
Brown Dwarf
Red Giant
radial velocity
open cluster
main sequence
Coalesce
Solar Winds
delta Scuti
Binary Star
homogeneous
The Smurfs
M3
Through this warm electricity I will give you bark branches and leaves curling upward into a safe sky
Astronomy
Allan Sandage
luminosity
globular cluster
peculiar
temperature
mass
collision
observation
Tucana
Homogenous
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