elements in main sequence stars?
483053
Well to astrophysisists there are three types of element, Hydrogen, Helium and metals (i.e. everything else and yes I know it's confusing that Oxygen is a metal but in astrophysics that's how things work).\n\nNow the confusion aside main sequence stars are mostly hydrogen but are fusing hydrogen into helium and tended to start with quite a bit of helium as well (being that the universe is 25% Helium).\n\nThe concentration of other elements varies from star to star and the concentration of each element also varies so there's not much to say there.
831018
http://www.chemicalelements.com/elements/be.html\n\nthis website may help you!!!!!! ( hope you get an A)
1138397
A star produces atoms in nuclear atomic chemical fusion or fission reactions.\nThe lifetime of a star takes fusion:\n3x4He > 12 C\n4 He + 12 C > 16 O plus 2x12 C > 20 Ne + 4 He\n56 Fe = Iron\n(4 He + 12 C = 16 O)+(2x12 C = 20 Ne + 4 He)_20 Ne + 4 He + 2x16 O\n= 56 Fe\nAs Iron consists to the sun's sunspots now for a magnetic field or liquid Iron of 5,000*C this gives the impression it is black against an even more hot and brighter gassy nuclear background.\nBut when the sun begins too end it's life the fusion reaches oxygen and then reaches Iron (Fe) and Beryllium (Be).\nAs the sun is completely filled with Be and Fe at the core. As metal absorbs energy and nuclear and gas forces out then the absorb from the metal core and as energy is released from the outer layers the star is unstable and is formed as a variable. The outer layers are swapped with the inners and the new outer layers are pushed off and out to a red giant until the core revs and the red giant keeps size for a while until a new process begins and the new inner layers of Oxygen from the old outer layers and the Oxygen keeps the red giant pushed out to size and then the whole star is cast as gas/plasma Iron and the star's power, heat and energy accelerates the star and with Oxygen inside, the explosion is created and a new atom is created, Gold.\nThe minerals create stars from 116 elementary chemicals.\nThe stars are made in the nebulae and new stars are made and so are planets. Thus the planets and stars create life from their chemicals and their chemicals come from the supernova.
542564
Meteors, Asteroids, comets, Nebula's (gaseous clouds where stars are born) photon stars, Neutron stars, pulsars, quasars, black holes, regular starts like out sun, galactic clusters, spiral galaxies, bar galaxies, moons, and planets, and solar systems.
660248
Stars "die" when they run out of hydrogen to turn into helium. Estimares of their life-expectancy are based on spectroscopic evidence of their current composition.
517542
Since all the numbers are filled in on the chart, and the transuranium elements are all man-made and fairly unstable, I think we're probably out of surprises as far as elements are concerned.  I say "probably" to cover my açç, as any good scientist does.  Who really knows what sπτt's going down in the core of the galaxy, for instance. \n\nAs far as *compounds* go, there's still lots and lots of wild and wacky stuff to be found.  What time does the Mother Ship leave, anybody know?
62632
Depends on the mass of the star....but for example for a star with mass similar to the Sun..\n\n1. Protostar contraction for roughly million years or slightly less.\n2. Main-sequence for roughly 9 billion years.  In this stage the core is burning hydrogen to helium.\n3. Giant stage.  Where the core that is filled with helium compresses and starts to heat up and make star expand.\n4. Planetary nebula\n5. White dwarf\n\nSome massive stars will burn other elements like helium and carbon and can turn into neutron stars or black hole.  Black holes happen for stars greater than roughly 25 solar masses.
1104100
The protons and electrons formed into stellar bodies. The stellar bodies converted the hydrogen into helium, carbon, nitrogen, and some other lighter elements.   \n\nStars with a mass of more than 5 solar masses are subject to becoming supernova--a massive stellar explosion.  The energy produced by that explosion produced all of the heavier elements and distributed them throughout the galaxy where they were captured by other gravitational fields.
49829
check this site...\nhttp://www.bbc.co.uk/science/space/stars/index.shtml
793719
Stellar Fusion.  Stellar Fusion can make elements up to Iron.  After that they can't fuse anything more heavy.  In really big stars, this limit causes the star to collapse, rebound, and explode, and it is thought that this explosion is powerful enough to fuse the other heavier elements.\n\nLately though, it seems that Supernovae are no longer enough, and there are physicists looking for other methods of fusion because stellar models predict that supernovae might not produce enough elements to explain the current observed amount of heavy elements out there....\n\nSo I guess it's still up in the air.
269280
Blue giant stars have left the main-sequence after exhausting their hydrogen fuel, leaving behind helium. Thus, blue giants fuse helium as their energy source. The star Rigel is a classic example of a blue giant.\n\nThis website for comfirmation --> http://www.enchantedlearning.com/subjects/astronomy/stars/startypes.shtml\n\nGod is spelled B-I-G B-A-N-G\n\nPBrax@netscape.com
694258
Distant galaxies....\nGlobular star clusters...\nOpen star clusters...\nNebulae...\nVariable stars...
553165
its a type of star\n\n\nAccording to the Hertzsprung-Russell diagram, a red dwarf star is a small and relatively cool star, of the main sequence, either late K or M spectral type. They constitute the vast majority of stars and have a diameter and mass of less than one-third that of the Sun (down to 0.08 solar masses, which are brown dwarfs) and a surface temperature of less than 3,500 K. They emit little light, sometimes as little as 1/10,000th that of the sun. Due to the slow rate at which they burn hydrogen, red dwarfs have an enormous estimated lifespan; estimates range from tens of billions up to trillions of years. Red dwarfs never initiate helium fusion and so cannot become red giants; the stars slowly contract and heat up until all the hydrogen is consumed. In any event, there has not been sufficient time since the Big Bang for red dwarfs to evolve off the main sequence.\n\nThe fact that red dwarfs remain on the main sequence while older stars have moved off the main sequence allows one to date star clusters by finding the mass at which the stars turn off the main sequence. In addition, the fact that no red dwarfs have evolved off the main sequence has been observed as evidence that the universe has a finite age.\n\nOne mystery which has not been solved as of 2004 is the lack of red dwarf stars with no metals (in astronomy a metal is any element other than hydrogen and helium). The Big Bang model predicts the first generation of stars should have only hydrogen, helium, and lithium. If such stars included red dwarfs, they should still be observable today, but are not. The conventional explanation is that without heavy elements, low mass stars cannot form. Since a low mass star fuses hydrogen in the presence of metals, then an early protostar of such a low mass devoid of metals would not 'go nuclear', it would simply sit around as a clump of gas until more material came along. This supports the theory that the first stars were extremely high mass population III stars which died quickly and produced the metals necessary for low mass stars to form later.\n\nRed dwarf stars are believed to be the most common star type in the universe. Proxima Centauri, the nearest star to the Sun, is a red dwarf (Type M5, magnitude 11.0), as are twenty of the next thirty nearest. However, due to their low luminosity, few are known.\n\nExoplanets have been discovered orbiting red dwarfs in 2005, one as small as the size of Neptune, or seventeen earth masses. It orbits just 6 million kilometers from its star, and so is estimated to have a surface temperature of 150 °C, despite how dim the star is.[1]. In 2006 a planet similar to Earth was found orbiting a red dwarf; it lies 390 million km from the star and its surface temperature is -220 °C.
714340
look up the periodic table...duh
1088976
here you go:\n\nhttp://www.enchantedlearning.com/subjects/astronomy/stars/startypes.shtml\n\nFrom your list it would be nova, but that is for a (relatively) short period of time.
329771
YES it is a heavy metal.  \n\nIron is a chemical element with the symbol Fe (L.: Ferrum) and atomic number 26. Iron is a group 8 and period 4 metal. Iron is notable for being the final element produced by stellar nucleosynthesis, and thus the heaviest element which does not require a supernova or similarly cataclysmic event for its formation. It is therefore the most abundant heavy metal in the universe.
525144
A star by the burning of hydrogen into helium can only go so far into making the heavier elements. It takes a supernova explosion to make the really heavy elements. These are blown out into space where new stars may form and use these heavier elements, like our sun and earth.