Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/B-type_main-sequence_star> ?p ?o }
- B-type_main-sequence_star abstract "A B-type main-sequence star (B V) is a main-sequence (hydrogen-burning) star of spectral type B and luminosity class V. These stars have from 2 to 16 times the mass of the Sun and surface temperatures between 10,000 and 30,000 K. B-type stars are extremely luminous and blue. Their spectra have neutral helium, which are most prominent at the B2 subclass, and moderate hydrogen lines. Examples include Regulus and Algol A.This class of stars was introduced with the Harvard sequence of stellar spectra and published in the Revised Harvard photometry catalogue. The definition of type B-type stars was the presence of non-ionized helium lines with the absence of singly ionized helium in the blue-violet portion of the spectrum. All of the spectral classes, including the B type, were subdivided with a numerical suffix that indicated the degree to which they approached the next classification. Thus B2 is two tenths of the way from type B (or B0) to type A.Later, however, more refined spectra showed lines of ionized helium for stars of type B0. Likewise, A0 stars also show weak lines of non-ionized helium. Subsequent catalogues of stellar spectra classified the stars based on the strengths of absorption lines at specific frequencies, or by comparing the strengths of different lines. Thus, in the MK Classification system, the spectral class B0 has the line at wavelength 438.7 nm being stronger than the line at 420.0 nm. The Balmer series of hydrogen lines grows stronger through the B class, then peak at type A2. The lines of ionized silicon are used to determine the sub-class of the B-type stars, while magnesium lines are used to distinguish between the temperature classes.Type-B stars do not have a corona and lack a convection zone in their outer atmosphere. They have a higher mass loss rate than smaller stars such as the Sun, and their stellar wind has velocities of about 3,000 km/s. The energy generation in main-sequence B-type stars comes from the CNO cycle of thermonuclear fusion. Because the CNO cycle is very temperature sensitive, the energy generation is heavily concentrated at the center of the star, which results in a convection zone about the core. This results in a steady mixing of the hydrogen fuel with the helium byproduct of the nuclear fusion. Many B-type stars have a rapid rate of rotation, with an equatorial rotation velocity of about 200 km/s.".
- B-type_main-sequence_star thumbnail Avior.png?width=300.
- B-type_main-sequence_star wikiPageID "1575837".
- B-type_main-sequence_star wikiPageLength "10540".
- B-type_main-sequence_star wikiPageOutDegree "62".
- B-type_main-sequence_star wikiPageRevisionID "705048784".
- B-type_main-sequence_star wikiPageWikiLink 18_Tau.
- B-type_main-sequence_star wikiPageWikiLink 22_Scorpii.
- B-type_main-sequence_star wikiPageWikiLink 29_Persei.
- B-type_main-sequence_star wikiPageWikiLink 42_Orionis.
- B-type_main-sequence_star wikiPageWikiLink 90_Leonis.
- B-type_main-sequence_star wikiPageWikiLink A-type_main-sequence_star.
- B-type_main-sequence_star wikiPageWikiLink Algol.
- B-type_main-sequence_star wikiPageWikiLink B(e)_star.
- B-type_main-sequence_star wikiPageWikiLink Balmer_series.
- B-type_main-sequence_star wikiPageWikiLink Beta2_Sco.
- B-type_main-sequence_star wikiPageWikiLink Blue_giant.
- B-type_main-sequence_star wikiPageWikiLink Blue_supergiant.
- B-type_main-sequence_star wikiPageWikiLink Bright_Star_Catalogue.
- B-type_main-sequence_star wikiPageWikiLink CNO_cycle.
- B-type_main-sequence_star wikiPageWikiLink Category:B-type_main-sequence_stars.
- B-type_main-sequence_star wikiPageWikiLink Category:Star_types.
- B-type_main-sequence_star wikiPageWikiLink Convection_zone.
- B-type_main-sequence_star wikiPageWikiLink Corona.
- B-type_main-sequence_star wikiPageWikiLink Effective_temperature.
- B-type_main-sequence_star wikiPageWikiLink Electromagnetic_radiation.
- B-type_main-sequence_star wikiPageWikiLink Eta_Aurigae.
- B-type_main-sequence_star wikiPageWikiLink Eta_Ursae_Majoris.
- B-type_main-sequence_star wikiPageWikiLink Forbidden_mechanism.
- B-type_main-sequence_star wikiPageWikiLink HD_21071.
- B-type_main-sequence_star wikiPageWikiLink HD_36936.
- B-type_main-sequence_star wikiPageWikiLink HIP_78530_b.
- B-type_main-sequence_star wikiPageWikiLink HR_2328.
- B-type_main-sequence_star wikiPageWikiLink Helium.
- B-type_main-sequence_star wikiPageWikiLink Be_star.
- B-type_main-sequence_star wikiPageWikiLink Hydrogen.
- B-type_main-sequence_star wikiPageWikiLink Hydrogen_spectral_series.
- B-type_main-sequence_star wikiPageWikiLink Ionization.
- B-type_main-sequence_star wikiPageWikiLink Kappa_Andromedae_b.
- B-type_main-sequence_star wikiPageWikiLink Kelvin.
- B-type_main-sequence_star wikiPageWikiLink Main_sequence.
- B-type_main-sequence_star wikiPageWikiLink Omega_For.
- B-type_main-sequence_star wikiPageWikiLink Omega_Scorpii.
- B-type_main-sequence_star wikiPageWikiLink Peculiar_star.
- B-type_main-sequence_star wikiPageWikiLink Quantum_mechanics.
- B-type_main-sequence_star wikiPageWikiLink Regulus.
- B-type_main-sequence_star wikiPageWikiLink Rho_Aurigae.
- B-type_main-sequence_star wikiPageWikiLink Solar_mass.
- B-type_main-sequence_star wikiPageWikiLink Spectral_line.
- B-type_main-sequence_star wikiPageWikiLink Star.
- B-type_main-sequence_star wikiPageWikiLink Star_count.
- B-type_main-sequence_star wikiPageWikiLink Stellar_classification.
- B-type_main-sequence_star wikiPageWikiLink Stellar_mass.
- B-type_main-sequence_star wikiPageWikiLink Stellar_rotation.
- B-type_main-sequence_star wikiPageWikiLink Stellar_wind.
- B-type_main-sequence_star wikiPageWikiLink Subdwarf_B_star.
- B-type_main-sequence_star wikiPageWikiLink Subgiant.
- B-type_main-sequence_star wikiPageWikiLink Sun.
- B-type_main-sequence_star wikiPageWikiLink Supergiant.
- B-type_main-sequence_star wikiPageWikiLink Tau_Scorpii.
- B-type_main-sequence_star wikiPageWikiLink Thermonuclear_fusion.
- B-type_main-sequence_star wikiPageWikiLink Upsilon_Orionis.
- B-type_main-sequence_star wikiPageWikiLink File:Avior.png.
- B-type_main-sequence_star wikiPageWikiLinkText "B".
- B-type_main-sequence_star wikiPageWikiLinkText "B-class star".
- B-type_main-sequence_star wikiPageWikiLinkText "B-type main-sequence objects".
- B-type_main-sequence_star wikiPageWikiLinkText "B-type main-sequence star".
- B-type_main-sequence_star wikiPageWikiLinkText "B-type".
- B-type_main-sequence_star wikiPageWikiLinkText "B1 main-sequence star".
- B-type_main-sequence_star wikiPageWikiLinkText "B2".
- B-type_main-sequence_star wikiPageWikiLinkText "B5Vn".
- B-type_main-sequence_star wikiPageWikiLinkText "B9.5V".
- B-type_main-sequence_star wikiPageWikiLinkText "blue color range".
- B-type_main-sequence_star wikiPageWikiLinkText "blue main-sequence star".
- B-type_main-sequence_star wikiPageWikiLinkText "blue main-sequence".
- B-type_main-sequence_star wikiPageWikiLinkText "blue-white main sequence stars".
- B-type_main-sequence_star wikiPageWikiLinkText "blue-white main-sequence star".
- B-type_main-sequence_star wikiPageWikiLinkText "in blue".
- B-type_main-sequence_star wikiPageWikiLinkText "main sequence star".
- B-type_main-sequence_star wikiPageWikiLinkText "main-sequence".
- B-type_main-sequence_star wikiPageWikiLinkText "spectral type B".
- B-type_main-sequence_star wikiPageWikiLinkText "spectral type B8 Iae".
- B-type_main-sequence_star wikiPageUsesTemplate Template:Main.
- B-type_main-sequence_star wikiPageUsesTemplate Template:Reflist.
- B-type_main-sequence_star wikiPageUsesTemplate Template:See_also.
- B-type_main-sequence_star wikiPageUsesTemplate Template:Star.
- B-type_main-sequence_star subject Category:B-type_main-sequence_stars.
- B-type_main-sequence_star subject Category:Star_types.
- B-type_main-sequence_star hypernym Star.
- B-type_main-sequence_star type Star.
- B-type_main-sequence_star type Redirect.
- B-type_main-sequence_star type Thing.
- B-type_main-sequence_star type Concept.
- B-type_main-sequence_star comment "A B-type main-sequence star (B V) is a main-sequence (hydrogen-burning) star of spectral type B and luminosity class V. These stars have from 2 to 16 times the mass of the Sun and surface temperatures between 10,000 and 30,000 K. B-type stars are extremely luminous and blue. Their spectra have neutral helium, which are most prominent at the B2 subclass, and moderate hydrogen lines.".
- B-type_main-sequence_star label "B-type main-sequence star".
- B-type_main-sequence_star seeAlso Stellar_classification.
- B-type_main-sequence_star sameAs Q767432.
- B-type_main-sequence_star sameAs نجوم_النسق_الأساسي_نوع-B.
- B-type_main-sequence_star sameAs Αστέρας_τύπου_Β.
- B-type_main-sequence_star sameAs B-tyypin_pääsarjan_tähti.