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Blue supergiant star

Blue supergiant stars are hot luminous stars, referred to scientifically as OB supergiants. They have luminosity class I and spectral class B9 or earlier.

Blue supergiants (BSGs) are found towards the top left of the Hertzsprung–Russell diagram to the right of the main sequence. They are larger than the Sun but smaller than a red supergiant, with surface temperatures of 10,000–50,000 K and luminosities from about 10,000 to a million times the Sun.

Formation

Supergiants are evolved high-mass stars, larger and more luminous than main-sequence stars. O class and early B class stars with initial masses around 10-100 M☉ evolve away from the main sequence in just a few million years as their hydrogen is consumed and heavy elements start to appear near the surface of the star. These stars usually become blue supergiants, although it is possible that some of them evolve directly to Wolf–Rayet stars. 

Expansion into the supergiant stage occurs when hydrogen in the core of the star is depleted and hydrogen shell burning starts, but it may also be caused as heavy elements are dredged up to the surface by convection and mass loss due to radiation pressure increase.

Blue supergiants are newly evolved from the main sequence, have extremely high luminosities, high mass loss rates, and are generally unstable. Many of them become luminous blue variables (LBVs) with episodes of extreme mass loss. Lower mass blue supergiants continue to expand until they become red supergiants. In the process they obviously must spend some time as yellow supergiants or yellow hypergiants, but this expansion occurs in just a few thousand years and so these stars are rare. Higher mass red supergiants blow away their outer atmospheres and evolve back to blue supergiants, and possibly onwards to Wolf–Rayet stars. Depending on the exact mass and composition of a red supergiant, it can execute a number of blue loops before either exploding as a type II supernova or finally dumping enough of its outer layers to become a blue supergiant again, less luminous than the first time but more unstable. If such a star can pass through the yellow evolutionary void it is expected that it becomes one of the lower luminosity LBVs.

The most massive blue supergiants are too luminous to retain an extensive atmosphere and they never expand into a red supergiant. The dividing line is approximately 40 M☉, although the coolest and largest red supergiants develop from stars with initial masses of 15-25 M☉. It isn’t clear whether more massive blue supergiants can lose enough mass to evolve safely into a comfortable old age as a Wolf Rayet star and finally a white dwarf, or they reach the Wolf Rayet stage and explode as supernovae, or they explode as supernovae while blue supergiants.

Properties

Because of their extreme masses they have relatively short lifespans and are mainly observed in young cosmic structures such as open clusters, the arms of spiral galaxies, and in irregular galaxies. They are rarely observed in spiral galaxy cores, elliptical galaxies, or globular clusters, most of which are believed to be composed of older stars, although the core of the Milky Way has recently been found to be home to several massive open clusters and associated young hot stars.

The best known example is Rigel, the brightest star in the constellation of Orion. Its mass is about 20 times that of the Sun, and its luminosity is around 117,000 times greater. Despite their rarity and their short lives they are heavily represented among the stars visible to the naked eye; their immense brightness is more than enough to compensate for their scarcity.

Blue supergiants have fast stellar winds and the most luminous, called hypergiants, have spectra dominated by emission lines that indicate strong continuum driven mass loss. Blue supergiants show varying quantities of heavy elements in their spectra, depending on their age and the efficiency with which the products of nucleosynthesis in the core are convected up to the surface. Quickly rotating supergiants can be highly mixed and show high proportions of helium and even heavier elements while still burning hydrogen at the core, and these stars show spectra very similar to a Wolf Rayet star.

While the stellar wind from a red supergiant is dense and slow, the wind from a blue supergiant is fast but sparse. When a red supergiant becomes a blue supergiant, the faster wind it produces impacts the already emitted slow wind and causes the outflowing material to condense into a thin shell. In some cases several concentric faint shells can be seen from successive episodes of mass loss, either previous blue loops from the red supergiant stage, or eruptions such as LBV outbursts.

Astronomers suggest that blue supergiant stars may be the most likely sources of ultra-long GRBs. These stars hold about 20 times the sun’s mass and may reach sizes 1,000 times larger than the sun, making them nearly wide enough to span Jupiter’s orbit.

Source

Rigel

Fourth image: Hubble Space Telescope image of nebula M1-67 around Wolf–Rayet star WR 124. (source).

Fifth image:  Rigel and the IC 2118 nebula which it illuminates. (source).  

Sixth image: Spectrum of a B2 star. (souce).

Seventh image: Star cluster NGC 3572 and its surroundings. (source).

Eighth image: Orion constellation (The star Rigel is at the top right of the image. by: Joseph Brimacombe)

images of star comparisons. (nasa).

please read. and please reblog.

Please, please read.

3 years ago I wrote a very personal prose piece titled The Morning After I Killed Myself, about a young woman who commits suicide and looks back on the impact it has on her family and friends and ends up regretting her decision. I posted it on my writing blog 3 years ago and it went viral, shared over 300,000 times on my blog and almost a million times on Imgur/Reddit. 

So many people have told me it’s saved their lives.

But I almost wish I hadn’t written it. Because, despite all the good it managed to do, it’s been plagiarized over a hundred times, probably several hundred. I’ve seen dozens of cases of it being stolen and retitled with someone else’s name as the author, cases of it being published in someone else’s book under their name, cases of it being used as song lyrics by a band who claims they wrote it, cases of it being posted nearly ten times on the same website alone and because the website is so enormous they didn’t catch each instance of plagiarism…

Once a girl based her senior art thesis off of my piece…only she accidentally based it off of a plagiarized version of my piece and had no idea. She called me, a complete stranger, in tears, begging me to forgive her for something that was not her fault at all, but the fault of the person who plagiarized me. She had to redo portions of the thesis she worked so hard on.

I’ve had cases of it being submitted to writing contests under other peoples’ names and them winning awards for it. One girl submitted it to the Scholastic Art and Writing Awards and won a gold key for it, coincidentally the same contest I submitted some of my work to in high school and won awards for. What was her excuse? She said she read the piece awhile ago, liked it so much that she saved it to her computer, and when the time came to submit to the contest, she “forgot she hadn’t written it” and sent it in under her name.

I had a case of a stranger who posted it on their blog under their name and when I asked them, politely, to provide me with credit and remove their name, they claimed they’d “written the piece 10 years ago in their private journal and that I was the one who plagiarized them.”

I’ve had cases of people messaging my writing blog and accusing me of plagiarism…of my own piece, because they saw plagiarized versions of it going viral and had no idea I was the original author.

And finally, a few weeks ago, a girl submitted it to a contest under her name and won $100 for it. Now she’s apparently denying plagiarism.

This piece of mine was intended to help people. It’s a very very personal piece and always will be. I’m glad it’s helped so many people. But something that is so personal and painful for me has been twisted and manipulated and stolen and published for profit and taken away from me so many times I’ve lost count. I don’t care about money. But when I saw this girl win $100 for a piece about suicide that I wrote, that is the last straw.

Please, for the love of god, don’t steal from artists and writers. Don’t steal something and claim you wrote it. Write and create your own work. If you see a piece of art or writing floating around with no source or a mis-attributed source, tell the original author. Spread the word. Don’t share artworks without sources on them. 

You might think that it’s not a big deal, that it doesn’t matter, that it only happened once.

But it happens all the time. All the time. This is exhausting and artists deserve credit. They deserve respect.

I’ve considered deleting the writing blog I’ve had for 5 years because of how often this piece is plagiarized.

Don’t let it get to that point, where someone considers getting rid of something they love because it’s hardly theirs anymore.

Thanks for reading.

photo: abi laurel

model: nicole ruggiero

makeup: dollfille 

instagram: @abi_laurel

side blog: @turnt-shoujo​

Photographer: NASA

body: you are dying of The Heat

me: [removes blanket]

body: never have you been So Frozen

GLASSBook, Jan 2014

“Neon”

Photographer & Concept: Edina Csoboth

Wardrobe Styling: Peter Frak

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