Post common envelope binary (original) (raw)
Uma variável pré-cataclísmica ou binária pós-envelope comum (PCEB), é um sistema binário que consiste em uma anã branca e uma estrela da sequência principal ou uma anã marrom. A estrela ou anã marrom compartilhava um envelope comum com o progenitor da anã branca na fase gigante vermelha.
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| dbo:abstract | A post-common envelope binary (PCEB) or pre-cataclysmic variable is a binary system consisting of a white dwarf or hot subdwarf and a main-sequence star or a brown dwarf. The star or brown dwarf shared a common envelope with the white dwarf progenitor in the red giant phase. In this scenario the star or brown dwarf loses angular momentum as it orbits within the envelope, eventually leaving a main-sequence star and white dwarf in a short-period orbit. A PCEB will continue to lose angular momentum via magnetic braking and gravitational waves and will eventually begin mass-transfer, resulting in a cataclysmic variable. While there are thousands of PCEBs known, there are only a few eclipsing PCEBs, also called ePCEBs. Even more rare are PCEBs with a brown dwarf as the secondary. A brown dwarf with a mass lower than 20 MJ might evaporate during the common envelope phase and therefore the secondary is supposed to have a mass higher than 20 MJ. The material ejected from the common envelope forms a planetary nebula. One in five planetary nebulae are ejected from common envelopes, but this might be an underestimate. A planetary nebula formed by a common envelope system usually shows a bipolar structure. The suspected PCEB HD 101584 is surrounded by a complex nebula. During the common envelope phase the red giant phase of the primary was terminated prematurely, avoiding a stellar merger. The remaining hydrogen envelope of HD 101584 was ejected during the interaction between the red giant and the companion and it now forms the circumstellar medium around the binary. Many eclipsing post-common envelope binaries show variations in the timing of eclipses, the cause of which is uncertain. While orbiting exoplanets are often proposed as the cause of these variations, planetary models often fail to predict subsequent changes in eclipse timing. Other proposed causes, such as the Applegate mechanism, often cannot fully explain the observed eclipse timing variations either. (en) Предкатаклизмическая переменная (англ. pre-cataclysmic variable) или двойная после стадии общей оболочки (англ. Post Common Envelope Binary, PCEB) — двойная звезда, состоящая из белого карлика и звезды главной последовательности или коричневого карлика. Звезда или коричневый карлик обладает общей оболочкой с предшественником белого карлика на стадии красного гиганта. В таком сценарии эволюции звезда или коричневый карлик теряют угловой момент по мере обращения внутри оболочки, что приводит к сжатию взаимной орбиты с белым карликом. Двойная продолжит терять угловой момент по мере взаимодействия с магнитным полем и испускания гравитационных волн, вследствие чего со временем возникнет перенос массы между компонентами и двойная превратится в катаклизмическую переменную. Известны тысячи предкатаклизмических звёзд, но среди них всего лишь несколько являются затменными, носящие обозначение ePCEBs. Ещё более редкими являются системы с коричневым карликом в качестве второго компонента. Коричневый карлик с массой менее 20 MJ испарится в течение стадии общей оболочки, поэтому второй компонент должен иметь массу больше 20 MJ. (ru) Uma variável pré-cataclísmica ou binária pós-envelope comum (PCEB), é um sistema binário que consiste em uma anã branca e uma estrela da sequência principal ou uma anã marrom. A estrela ou anã marrom compartilhava um envelope comum com o progenitor da anã branca na fase gigante vermelha. (pt) |
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| rdfs:comment | Uma variável pré-cataclísmica ou binária pós-envelope comum (PCEB), é um sistema binário que consiste em uma anã branca e uma estrela da sequência principal ou uma anã marrom. A estrela ou anã marrom compartilhava um envelope comum com o progenitor da anã branca na fase gigante vermelha. (pt) A post-common envelope binary (PCEB) or pre-cataclysmic variable is a binary system consisting of a white dwarf or hot subdwarf and a main-sequence star or a brown dwarf. The star or brown dwarf shared a common envelope with the white dwarf progenitor in the red giant phase. In this scenario the star or brown dwarf loses angular momentum as it orbits within the envelope, eventually leaving a main-sequence star and white dwarf in a short-period orbit. A PCEB will continue to lose angular momentum via magnetic braking and gravitational waves and will eventually begin mass-transfer, resulting in a cataclysmic variable. While there are thousands of PCEBs known, there are only a few eclipsing PCEBs, also called ePCEBs. Even more rare are PCEBs with a brown dwarf as the secondary. A brown dwarf (en) Предкатаклизмическая переменная (англ. pre-cataclysmic variable) или двойная после стадии общей оболочки (англ. Post Common Envelope Binary, PCEB) — двойная звезда, состоящая из белого карлика и звезды главной последовательности или коричневого карлика. Звезда или коричневый карлик обладает общей оболочкой с предшественником белого карлика на стадии красного гиганта. В таком сценарии эволюции звезда или коричневый карлик теряют угловой момент по мере обращения внутри оболочки, что приводит к сжатию взаимной орбиты с белым карликом. Двойная продолжит терять угловой момент по мере взаимодействия с магнитным полем и испускания гравитационных волн, вследствие чего со временем возникнет перенос массы между компонентами и двойная превратится в катаклизмическую переменную. Известны тысячи предкат (ru) |
| rdfs:label | Post common envelope binary (en) Предкатаклизмическая переменная (ru) Variável pré-cataclísmica (pt) |
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