How are blue stragglers formed?

The most likely explanation is that blue stragglers are the result of stars that come too close to another star or similar mass object and collide. The newly formed star has thus a higher mass, and occupies a position on the HR diagram which would be populated by genuinely young stars.

Why are blue stragglers surprising?

Blue stragglers are unusual that they are bigger and bluer than the rest of the stars (See picture for reference). … They also have masses two to three times that of the other stars. This suggests that they were formed from two or three stars which collided and merged.

Are blue stragglers common?

There is evidence in favor of this view, notably that blue straggler stars appear to be much more common in dense regions of clusters, especially in the cores of globular clusters. Since there are more stars per unit volume, collisions and close-encounters are far more likely in clusters than among field stars.

What are the so called blue stragglers?

Blue stragglers are anomalous young stars found in globular clusters of much older stars. They appear to be bluer and hotter than their neighbors. These stellar oddities have mystified astronomers, who don’t know exactly how they form.

Where are blue stragglers found?

Blue Stragglers are unusually hot and bright stars found in the cores of ancient star clusters known as globulars. Globular clusters are located in galactic halos, of which the Milky Way may have from 180 to 200, or more.

Where does Joshua Barnes think stars come from?

Where does Joshua Barnes think they come from? The end – death.

How do astronomers explain the existence of blue stragglers?

How do astronomers explain the existence of blue stragglers? They are main-sequence stars whose evolution has been altered by mergers or binary companions, causing them to live longer than usual for a star of their spectral type. … burn their hydrogen fuel more rapidly than the Sun.

What property of a star cluster helps determine its age?

What property of a star cluster helps determine its age? comparable in mass to the Sun. Because of stellar nucleosynthesis, the spectra of old stars show more heavy elements than those of young stars.

Why is it odd to find blue stars in globular clusters?

Blue stragglers are a class of star observed in old, dense stellar systems such as globular clusters. They stand out because old stellar populations are expected to be devoid of blue (high-mass) stars which possess very short lifespans.

Read More:  What is a bouillon cup?

How long do blue stragglers last?

2 billion years These blue stragglers have lifetimes of 2 billion years or less: incompatible with the cluster’s age.

Do brown dwarfs have fusion?

Brown dwarfs are an odd set of objects that are neither planets nor stars. … However, if a brown dwarf has at least 13 times the mass of Jupiter, it can ignite a limited form of fusion. These brown dwarfs fuse a heavy isotope of hydrogen, called deuterium, into helium, releasing energy like a star.

What are blue stragglers in globular clusters?

Abstract. Blue stragglers in globular clusters are abnormally massive stars that should have evolved off the stellar main sequence long ago. There are two known processes that can create these objects: direct stellar collisions1 and binary evolution2.

What is the meaning of globular cluster?

globular cluster, a large group of old stars that are closely packed in a symmetrical, somewhat spherical form. Globular clusters, so called because of their roughly spherical appearance, are the largest and most massive star clusters.

What type of stars do globular clusters contain?

Globular clusters are generally composed of hundreds of thousands of low-metal, old stars. The type of stars found in a globular cluster are similar to those in the bulge of a spiral galaxy but confined to a spheroid in which half the light is emitted within a radius of only a few to a few tens of parsecs.

Why do stars collide?

A stellar collision is the coming together of two stars caused by stellar dynamics within a star cluster, or by the orbital decay of a binary star due to stellar mass loss or gravitational radiation, or by other mechanisms not yet well understood.

Where is the main sequence turn off point of a star cluster?

The turnoff point for a star refers to the point on the Hertzsprung-Russell diagram where it leaves the main sequence after the exhaustion of its main fuel. It is often referred to as the main sequence turnoff. By plotting the turnoff point of the stars in star clusters, one can estimate the cluster’s age.

Read More:  What is the meaning of at the sight?

What is the early phase of the star called once the gas and dust began to coalesce?

The contracting cloud is then called a protostar. A protostar is the earliest stage of a star’s life. A star is born when the gas and dust from a nebula become so hot that nuclear fusion starts. Once a star has turned on it is known as a main sequence star.

What causes them to form in a globular cluster?

Globular clusters formed from giant molecular clouds, or huge masses of gas that form stars as they collapse. … The first set of stars gobble up most of the gas, then as they die (millions of years later) they eject the gas.

How do you know a star has been born in the ISM?

If a star is being born, the cloud will send out different radio waves than if no star is being born within it. The use of radio waves allows astronomers to see when stars are being born, even though the molecular cloud is dark.

Why are we sometimes called Stardust?

The star then explodes outward as a supernova. This supernova explosion creates all the elements heavier than iron. … And, these particles were all forged in the nuclear fusion fires of stars. We truly are made of star dust.

What’s the most important force in astronomy?

Gravity Gravity is one of the fundamental forces in the Universe. Although gravity is the weakest of all the forces in the Universe, it is the most important force in the study of astronomy. Originaly defined by Newton, and refined by Einstein, gravity is essentially the natural force of attraction between any two objects.

Why don t stars Live Forever which stars live the longest?

Stars cannot live forever because, as the main sequence star ages, it’s core temperature rises and both it’s luminosity and radius increase. … M-type stars (red dwarfs) live the longest because they consume their fuel so slowly.

What inevitably forces a star like the Sun to evolve?

What inevitably forces a star like the Sun to evolve away from being a main sequence star? Helium builds up in the core, while the hydrogen burning shell expands. Just as a low-mass main sequence star runs out of fuel in its core, it actually becomes brighter. … What is the name of the star labeled 10?

Read More:  What does being anesthetized mean?

What is a planetary nebula quizlet?

A planetary nebula is the ejected shell of an evolved giant star. It is the shape of a spherical shell and is composed of relatively cool thing gas, which was once the outer part of the star. A planetary nebula is associated with the death of a low mass star.

What star color is the hottest?

Blue stars White stars are hotter than red and yellow. Blue stars are the hottest stars of all.

Which star cluster is the youngest?

Within age uncertainties, Segue 3 appears to be the youngest globular cluster so far known in the halo, or in the whole Galaxy altogether.

Which star cluster is the oldest?

A team of astronomers using the Gemini-South telescope has discovered one of the oldest stellar clusters in the Milky Way. The team’s results date the globular cluster, named HP 1, at about 12.8 billion years, making its stars among the oldest ever found in our Galaxy.

What is the current best explanation for the existence of blue stragglers?

The most likely explanation for blue stragglers seems to be that they are the result of stellar collisions or mass transfer from another star. That way, a star which is red, cool and already somewhat old can get extra mass and turn bluer.

Which of the following statements best describes globular clusters?

Which of the following statements best describes globular clusters? They contain from hundreds of thousands to millions of stars and have a typical size of about 50 parsecs.

Which types of stars are known as failed stars?

Because brown dwarfs never burn fusion at their core, scientists sometimes refer to them as failed stars.