Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Pre-main-sequence_star> ?p ?o. }
Showing items 1 to 40 of
40
with 100 items per page.
- Pre-main-sequence_star abstract "A pre-main-sequence star (also known as a PMS star and PMS object) is a star in the stage when it has not yet reached the main sequence. It can be a T Tauri star or FU Orionis star (fewer than 2 solar masses) or a Herbig Ae/Be star (2–8 solar masses). More massive (>8 Solar mass) stars in pre-main-sequence stage are not observed, because they evolve very quickly: when they become visible (i.e. disperses surrounding circumstellar gas and dust cloud), the hydrogen in the center is already burning and they are main-sequence objects.The energy source of these objects is gravitational contraction (as opposed to hydrogen burning in main-sequence stars). On the Hertzsprung–Russell diagram, the pre-main-sequence stage of stars with masses more than 0.5 solar masses translates into a move along Hayashi tracks (almost vertically down) and later along Henyey tracks (almost horizontally to the left, towards the main sequence), while the pre-main-sequence stage of stars with masses less than 0.5 solar masses translates into a move along the Hayashi track for the entirety of their pre-main-sequence stage.PMS stars can be differentiated from main-sequence dwarf stars by using stellar spectra to measure the correlation between gravity and temperature. A PMS star will have a larger radius than a main-sequence star, and thus be less dense and have lower surface gravity.While the surrounding matter is falling onto the central condensation, it is considered to be a protostar. When the surrounding gas/dust envelope disperses and accretion process stops, the star is considered as pre-main-sequence star.Pre-main-sequence stars become optically visible after stellar birthline. Pre-main-sequence stage will last less than 1% of a star's life (in contrast, the star will spend about 80% of its life on the main sequence).It is believed that during this stage all stars have dense circumstellar disks, probable sites of planet formation.".
- Pre-main-sequence_star wikiPageID "5557857".
- Pre-main-sequence_star wikiPageRevisionID "603649578".
- Pre-main-sequence_star auto "yes".
- Pre-main-sequence_star date "December 2009".
- Pre-main-sequence_star hasPhotoCollection Pre-main-sequence_star.
- Pre-main-sequence_star subject Category:Hertzsprung–Russell_classifications.
- Pre-main-sequence_star subject Category:Star_formation.
- Pre-main-sequence_star subject Category:Star_types.
- Pre-main-sequence_star type Abstraction100002137.
- Pre-main-sequence_star type Act100030358.
- Pre-main-sequence_star type Activity100407535.
- Pre-main-sequence_star type Categorization101012712.
- Pre-main-sequence_star type Event100029378.
- Pre-main-sequence_star type Grouping101012360.
- Pre-main-sequence_star type Hertzsprung-RussellClassifications.
- Pre-main-sequence_star type PsychologicalFeature100023100.
- Pre-main-sequence_star type YagoPermanentlyLocatedEntity.
- Pre-main-sequence_star comment "A pre-main-sequence star (also known as a PMS star and PMS object) is a star in the stage when it has not yet reached the main sequence. It can be a T Tauri star or FU Orionis star (fewer than 2 solar masses) or a Herbig Ae/Be star (2–8 solar masses). More massive (>8 Solar mass) stars in pre-main-sequence stage are not observed, because they evolve very quickly: when they become visible (i.e.".
- Pre-main-sequence_star label "Estrela pré-sequência principal".
- Pre-main-sequence_star label "Estrella presecuencia principal".
- Pre-main-sequence_star label "Pre-main-sequence star".
- Pre-main-sequence_star label "Stella pre-sequenza principale".
- Pre-main-sequence_star label "Étoile de la pré-séquence principale".
- Pre-main-sequence_star label "Звёзды до главной последовательности".
- Pre-main-sequence_star label "主序前星".
- Pre-main-sequence_star label "前主系列星".
- Pre-main-sequence_star sameAs Estrella_presecuencia_principal.
- Pre-main-sequence_star sameAs Sekuentzia_nagusiaren_aurreko_izar.
- Pre-main-sequence_star sameAs Étoile_de_la_pré-séquence_principale.
- Pre-main-sequence_star sameAs Stella_pre-sequenza_principale.
- Pre-main-sequence_star sameAs 前主系列星.
- Pre-main-sequence_star sameAs 전주계열성.
- Pre-main-sequence_star sameAs Estrela_pré-sequência_principal.
- Pre-main-sequence_star sameAs m.0dsg6f.
- Pre-main-sequence_star sameAs Q1062509.
- Pre-main-sequence_star sameAs Q1062509.
- Pre-main-sequence_star sameAs Pre-main-sequence_star.
- Pre-main-sequence_star wasDerivedFrom Pre-main-sequence_star?oldid=603649578.
- Pre-main-sequence_star isPrimaryTopicOf Pre-main-sequence_star.