How are blue stragglers identified?

Answer 1

They are identified in their colour and in how they are behaving compared to other stars in the same star cluster.

Stars that persist longer than anticipated on the main sequence, which is the typical stage of a star's lifecycle during which hydrogen burns, are known as blue stragglers.

A star's color indicates both its temperature and mass; blue stars are hotter and more massive than red stars; since a star burns hydrogen more quickly when it is more massive, blue stars should have a shorter main sequence life than red stars.

Therefore, one can expect to see an orderly transition on a colour-magnitude diagram of a globular cluster (whose member stars formed at roughly the same time): stars that are bluer than a certain value (referred to as the "turnoff" point) will have already left the main sequence, while redder stars will remain on it; the cluster's age can be inferred from the location of the turnoff point.

However, it is common to find multiple stars in a cluster visible further down the main sequence after the turnoff; these are known as blue stragglers.

The most likely explanation for blue stragglers appears to be the result of stellar collisions or mass transfer from another star. In this way, a red, cool, and somewhat old star can acquire additional mass and become bluer; it burns its hydrogen at a slow enough rate to remain on the main sequence for the majority of its life, but at some point it gains additional mass and effectively "disguises" itself as a blue star, leading us to believe that it is younger than it actually is.

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Answer 2

Blue stragglers are distinguished from other stars in a star cluster by their greater temperature and luminosity relative to other stars in the same region of space. They also appear bluer and brighter than other stars in the cluster, which may indicate that they are more massive or younger than the surrounding stars.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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