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view source for main sequence wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in view source for main sequence add languages article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file page information get shortened url switch to legacy parser in other projects wikidata item appearance move to sidebar hide main sequence you do not have permission to edit this page for the following reason this ip address range has been globally blocked this does not affect your ability to read wikipedia pages most people who see this message have done nothing wrong some kinds of blocks restrict editing from specific service providers or telecom companies in response to recent abuse or vandalism and can sometimes affect other users who are unrelated to that abuse review the information below for assistance if you do not believe that you have done anything wrong this block affects editing on all wikimedia wikis the ip address or range 5 135 0 0 16 has been globally blocked by jon kolbert for the following reason s open proxy webhost visit the faq if you are affected this block will expire on 04 29 8 january 2027 your current ip address is 5 135 42 194 even while globally blocked you will usually still be able to edit pages on meta wiki if you believe you were blocked by mistake you can find additional information and instructions in the stewards block wizard other useful links global blocks help i have been blocked you can view and copy the source of this page formation and evolution star formation main star formation protostar pre main sequence star stellar evolution main sequence stellar mass objects file zams and tracks png thumb left zero age main sequence and evolutionary tracks file the violent youth of solar proxies jpg thumb upright 1 2 the violent youth of stars like the sun when a protostar is formed from the jeans instability collapse of a giant molecular cloud of gas and dust in the local interstellar medium the initial composition is homogeneous throughout consisting of approximately 70 hydrogen 28 helium and trace amounts of other elements by mass ref name asr34_1 the initial mass of the star depends on the local conditions within the cloud the mass distribution of newly formed stars is described empirically by the initial mass function ref name science295_5552 during the initial collapse this pre main sequence star generates thermal energy through the increase in pressure arising due to its gravitational contraction during this phase before hydrogen ignition the star will spend a length of time contracting known as the thermal time scale kelvin helmholtz or thermal timescale this timescale describes the length of time a star can last by radiating its internal kinetic energy once sufficiently dense stars begin converting hydrogen into helium and producing energy through an exothermic nuclear fusion process ref name tnc the nuclear timescale is useful to describe the length of time a star can last during this next phase when nuclear fusion of hydrogen becomes the dominant energy production process and the excess energy gained from gravitational contraction has been lost ref name science293_5538 the star lies along a curve on the hertzsprung russell diagram or hr diagram called the standard main sequence astronomers will sometimes refer to this stage as zero age main sequence or zams ref name zams_sao ref name hansen1999 the zams curve can be calculated using computer models of stellar properties at the point when stars begin hydrogen fusion from this point the brightness and surface temperature of stars typically increase with age ref name clayton83 a star remains near its initial position on the main sequence until a significant amount of hydrogen in the core has been consumed then begins to evolve into a more luminous star on the hr diagram the evolving star moves up and to the right of the main sequence thus the main sequence represents the primary hydrogen burning stage of a star s lifetime ref name tnc return to main sequence retrieved from https en wikipedia org wiki main_sequence privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search view source for main sequence add languages add topic