Английская Википедия:25 Serpentis

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Шаблон:Short description Шаблон:About Шаблон:Starbox begin Шаблон:Starbox image Шаблон:Starbox observe Шаблон:Starbox character Шаблон:Starbox astrometry Шаблон:Starbox orbit Шаблон:Starbox detail Шаблон:Starbox catalog Шаблон:Starbox reference Шаблон:Starbox end 25 Serpentis is a star system in the constellation of Serpens Caput. With an apparent magnitude of 5.37, it is just barely visible to the naked eye. The system is estimated to be some 450 light-years (138 parsecs) based on its parallax.[1]

Файл:PTSerLightCurve.png
A light curve for PT Serpentis, plotted from Hipparcos data[2]

25 Serpentis is a spectroscopic binary,[3] meaning that the individual components are too close to be resolved, but periodic Doppler shifts in their spectra indicate orbital motion. The system consists of a hot B-type giant and an A-type main-sequence star. The two stars orbit each other every 38.9 days, and have a very eccentric orbit, with an orbital eccentricity of 0.731.[4] The primary is a slowly pulsating B-type star, which causes the system to vary by 0.03 magnitudes;[5] for that reason it has been given the variable star designation PT Serpentis.

References

Шаблон:Reflist

Шаблон:Stars of Serpens

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  2. Ошибка цитирования Неверный тег <ref>; для сносок HIPCurve не указан текст
  3. Шаблон:Cite journal
  4. Шаблон:Cite journal
  5. Шаблон:Cite web