Data Portal @ linkeddatafragments.org

Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Delta_Scuti_variable> ?p ?o. }

• Delta_Scuti_variable abstract "A Delta Scuti variable (sometimes termed dwarf cepheid) is a variable star which exhibits variations in its luminosity due to both radial and non-radial pulsations of the star's surface. The variables are important standard candles and have been used to establish the distance to the Large Magellanic Cloud, globular clusters, open clusters, and the Galactic center. The variables follow a period-luminosity relation in certain passbands like other standard candles such as Cepheids. SX Phoenicis variables are generally considered to be a subclass of Delta Scuti variables that contain old stars, and can be found in globular clusters. SX Phe variables also follow a period-luminosity relation. The recently discovered Rapidly oscillating Ap stars are also a subclass of Delta Scuti variables, found on the main sequence. One last sub-class are the pre-main sequence (PMS) Delta Scuti variables.The OGLE and MACHO surveys have detected nearly 3000 Delta Scuti variables in the Large Magellanic Cloud. Typical brightness fluctuations are from 0.003 to 0.9 magnitudes in V over a period of a few hours, although the amplitude and period of the fluctuations can vary greatly. The stars are usually A0 to F5 type giant or main sequence stars. The high-amplitude Delta Scuti variables are also called AI Velorum stars. They are the second most abundant variable source in the Milky Way after white dwarfs.δ – Scuti stars exhibit both radial and non-radial luminosity pulsations. Non-radial pulsations are when some parts of the surface move inwards and some outward at the same time. Radial pulsations are a special case, where the star expands and contracts around its equilibrium state by altering the radius to maintain its spherical shape. The variations are due to the swelling and shrinking of the star through the Eddington Valve (or Kappa) Mechanism. The stars have a helium rich atmosphere. As helium is heated it becomes more ionised, which is more opaque. So at the dimmest part in the cycle the star has highly ionised opaque helium in its atmosphere blocking part of the light from escaping. The energy from this “blocked light” causes the helium to heat up, expand, ionise, become more transparent and therefore allow more light through. As more light is let through the star appears brighter and, with the expansion, the helium begins to cool down. Hence the helium contracts and heats up again and the cyclical process continues. Throughout their lifetime Delta Scuti stars exhibit pulsation when they are situated on the classical Cepheid instability strip. They then move across from the main sequence into the giant branch.The prototype of these sorts of variable stars is Delta Scuti, which exhibits brightness fluctuations from +4.60 to +4.79 in apparent magnitude with a period of 4.65 hours. Other well known Delta Scuti variables include Altair, Denebola (β Leonis) and β Cassiopeiae. Vega (α Lyrae) is a suspected Delta Scuti variable,[citation needed] but this remains unconfirmed.".
• Delta_Scuti_variable wikiPageExternalLink vsots_delsct.
• Delta_Scuti_variable wikiPageExternalLink AI_Velorum_star.html.
• Delta_Scuti_variable wikiPageID "2674245".
• Delta_Scuti_variable wikiPageRevisionID "585843250".
• Delta_Scuti_variable hasPhotoCollection Delta_Scuti_variable.
• Delta_Scuti_variable subject Category:Delta_Scuti_variables.
• Delta_Scuti_variable type DeltaScutiVariables.
• Delta_Scuti_variable type PhysicalEntity100001930.
• Delta_Scuti_variable type Thing100002452.
• Delta_Scuti_variable type Variable109468959.
• Delta_Scuti_variable comment "A Delta Scuti variable (sometimes termed dwarf cepheid) is a variable star which exhibits variations in its luminosity due to both radial and non-radial pulsations of the star's surface. The variables are important standard candles and have been used to establish the distance to the Large Magellanic Cloud, globular clusters, open clusters, and the Galactic center. The variables follow a period-luminosity relation in certain passbands like other standard candles such as Cepheids.".
• Delta_Scuti_variable label "Delta Scuti variable".
• Delta_Scuti_variable label "Delta Scuti-veranderlijke".
• Delta_Scuti_variable label "Delta-Scuti-Stern".
• Delta_Scuti_variable label "Estrella variable Delta Scuti".
• Delta_Scuti_variable label "Gwiazdy zmienne typu delta Scuti".
• Delta_Scuti_variable label "Variabile Delta Scuti".
• Delta_Scuti_variable label "Variável Delta Scuti".
• Delta_Scuti_variable label "Étoile variable de type Delta Scuti".
• Delta_Scuti_variable label "Переменная звезда типа Дельты Щита".
• Delta_Scuti_variable label "たて座デルタ型変光星".
• Delta_Scuti_variable label "矮造父變星".
• Delta_Scuti_variable sameAs Hvězdy_typu_Delta_Scuti.
• Delta_Scuti_variable sameAs Delta-Scuti-Stern.
• Delta_Scuti_variable sameAs Estrella_variable_Delta_Scuti.
• Delta_Scuti_variable sameAs Étoile_variable_de_type_Delta_Scuti.
• Delta_Scuti_variable sameAs Variabile_Delta_Scuti.
• Delta_Scuti_variable sameAs たて座デルタ型変光星.
• Delta_Scuti_variable sameAs 방패자리_델타형_변광성.
• Delta_Scuti_variable sameAs Delta_Scuti-veranderlijke.
• Delta_Scuti_variable sameAs Gwiazdy_zmienne_typu_delta_Scuti.
• Delta_Scuti_variable sameAs Variável_Delta_Scuti.
• Delta_Scuti_variable sameAs m.07x1yn.
• Delta_Scuti_variable sameAs Q836976.
• Delta_Scuti_variable sameAs Q836976.
• Delta_Scuti_variable sameAs Delta_Scuti_variable.
• Delta_Scuti_variable wasDerivedFrom Delta_Scuti_variable?oldid=585843250.
• Delta_Scuti_variable isPrimaryTopicOf Delta_Scuti_variable.