A Suggested Mechanism of Class Be Stars

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The course overall has good coverage of the subject and engaging supplementary materials through PyMOL, MATLAB, and database usage, but the interface, assessments, discussion environment seem half-baked.

Main sequence

Content-wise the lectures are very informative at a good pace. Yaffe discusses the topics with great economy of words to the point that the lecture transcriptions are enough to understand the topics discussed. A simple listing of goals and objectives at the beginning of every learning sequence gives an idea of the scope. Some of the test-yourself questions in th…. Some of the test-yourself questions in the learning sequence do not inspire thinking about the lectures but others are rather decent.

The first three problem sets are comprehensive enough with thought-provoking questions and with only minor issues about clarity. Problem sets are based on real-world examples, adding to student motivation. The user interface of the course is quite finicky with issues tracking progress and occasional simply poor design. The integrated mobile app is practically useless except for viewing the lecture videos, and it does not track your progress as with the desktop course. However, the content of the lectures is still good and the same as that of the desktop course. Note that if you do not pursue the verified track you will not be able to access all of the problem sets as per edX's change in policy about "free online courses".

This is not indicated anywhere on the course page before you enroll it appears completely free , and so you might be surprised that suddenly your access to assessments is restricted. Was this review helpful to you? Longest so-called "help" video is less than 4 minutes and even less useful. It's become a guessing game and I'm not going to keep playing it. If it's going to be part of the course, they really should say so up front. Problem set questions are either very good or they're very bad: if MATLAB, count on very bad and you won't be disappointed if you're unfamiliar with the language.

If selected images of peptides, usually pretty bad--it would invariably be better to be able to interact with them to get different viewpoints to answer questions. The ones chosen are never optimal, at least for me. Now the good: All that said, the biochem lectures themselves are excellent. Yaffe is a truly outstanding educator.

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He's intense, which I like, and a one-man show. He epitomizes the "drinking from a fire hose" education that is MIT, and is every bit its long suit. And it is this part of the educational experience that brings the eval up to 4 stars. It really is worth it, even if you have to do some cherry-picking about how to spend your time. For some, this may include more detail than they want, if a high level overview is desired, but however well one does on the testing, it is a real treat to have access to a professor like Michael Yaffe, who is extraordinaril….

For some, this may include more detail than they want, if a high level overview is desired, but however well one does on the testing, it is a real treat to have access to a professor like Michael Yaffe, who is extraordinarily knowledgeable and a very fine lecturer. Likewise, the associated faculty and staff do an excellent job preparing the support materials and illustrations that are incorporated into the lectures or are available as handouts.

In short, if you enjoy the opportunity to 'virtually' study at a very high level with some of the finest practitioners in their field, this is among the very best courses available to engage that passion. The lecture content is presented by Professor Yaffe in a clear and easy to follow format. When the helium core of low-mass stars becomes degenerate, or the outer layers of intermediate-mass stars cool sufficiently to become opaque, their hydrogen shells increase in temperature and the stars start to become more luminous.

This is known as the red giant branch ; it is a relatively long-lived stage and it appears prominently in H—R diagrams. These stars will eventually end their lives as white dwarfs.

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The most massive stars do not become red giants; instead, their cores quickly become hot enough to fuse helium and eventually heavier elements and they are known as supergiants. They follow approximately horizontal evolutionary tracks from the main sequence across the top of the H—R diagram. Supergiants are relatively rare and do not show prominently on most H—R diagrams.

Their cores will eventually collapse, usually leading to a supernova and leaving behind either a neutron star or black hole. When a cluster of stars is formed at about the same time, the main sequence lifespan of these stars will depend on their individual masses. The most massive stars will leave the main sequence first, followed in sequence by stars of ever lower masses.

The position where stars in the cluster are leaving the main sequence is known as the turnoff point. By knowing the main sequence lifespan of stars at this point, it becomes possible to estimate the age of the cluster. From Wikipedia, the free encyclopedia.

A continuous band of stars that appears on plots of stellar color versus brightness. For the racehorse, see Main Sequence horse. Hertzsprung—Russell diagram. Spectral type.

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A Driving Mechanism for the Newly Discovered Long-Period Pulsating Subdwarf B Stars - IOPscience

Brown dwarfs. White dwarfs. Red dwarfs. Main sequence "dwarfs". Bright giants. See also: Stellar nucleosynthesis. Main article: Stellar structure. Main article: Stellar evolution.

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However, see extinction. ESO Press Release. Retrieved 27 July Cambridge University Press. Twentieth Century Physics. The Observatory. Bibcode : Obs Bibcode : ZA The Stars. An atlas of stellar spectra, with an outline of spectral classification. Chicago, Illinois: The University of Chicago press. Retrieved The New Cosmos. Springer-Verlag New York Inc. Bibcode : NatAs Retrieved 2 April Advances in Space Research. Bibcode : AdSpR..

Global collapse of molecular clouds as a formation mechanism for the most massive stars

Bibcode : Sci Swinburne University. Principles of Stellar Evolution and Nucleosynthesis. University of Chicago Press. Australia Telescope Outreach and Education. Smith 21 April Gene Smith's Astronomy Tutorial. An Atlas of the Universe.

  1. A Driving Mechanism for the Newly Discovered Class of Pulsating Subdwarf B Stars - IOPscience?
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The Amateur Astronomer. University of Nebraska. University of St.

This is listed in the table as 1.