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kosmos: Sirius B

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Sirius B, on the other hand, cannot be seen to the naked eye as its luminosity is only 2% that of the Sun.

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Sirius B is a white dwarf star and the faint companion to Sirius A, the brightest star in Earth's night sky (also known as the "Dog Star"), located in the constellation of Canis Major or the "Greater Dog". It is a white dwarf, a remnant of an intermediate-mass star that has exhausted its fuel, and is the closest example to Earth. It is the secondary component of the Sirius binary system, of which the 'A' component is the brightest star in the night sky. Sirius B, on the other hand, cannot be seen to the naked eye as its luminosity is only 2% that of the Sun. Sirius is the fifth-nearest star system to the Sun, 8.6 light-years distant. Like all white dwarfs, Sirius B is dense: while its size is comparable to that of Earth, its mass is equivalent to that of the Sun. It is the remains of a 5 M☉ star that existed until around 100 million years ago. Sirius B's current temperature is 25,000 K (24,700 °C; 44,500 °F), 2.5 times hotter than Sirius A and over four times hotter than the Sun. It no longer produces energy via nuclear fusion, and it will cool as its remaining heat escapes to space over time. Due to its proximity, Sirius B has been the target of many studies in the last decades in attempt to discover extrasolar planets. None of them have detected a planet around Sirius B, though some planetary architecture still cannot be ruled out by current observations.

Kategoria: kosmos

Rodzina: kosmos

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HD 4222, also known as HR 196, is the primary of a binary star located in the northern constellation Cassiopeia. It is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.41. Gaia DR3 parallax measurements imply a distance of 353 light-years and it is drifting closer with a heliocentric radial velocity of −8.5 km/s. At its current distance, HD 4222's brightness is diminished by an interstellar extinction of 0.13 magnitudes and it has an absolute magnitude of +0.44. HD 4222 has a stellar classification of A2 Vs or A1 V, both classes indicating that it is an A-type main-sequence star that is generating energy via hydrogen fusion at its core. The for…

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40 Eridani is a triple star system in the constellation of Eridanus, abbreviated 40 Eri. It has the Bayer designation Omicron2 Eridani, which is Latinized from ο2 Eridani and abbreviated Omicron2 Eri or ο2 Eri. Based on parallax measurements taken by the Gaia mission, it is about 16.3 light-years (5.0 parsecs) from the Sun. The primary star of the system, designated 40 Eridani A and formally named Keid, is easily visible to the naked eye, with an apparent magnitude of 4.43. It is orbited by a binary pair whose two components are designated 40 Eridani B and C, and which were discovered on January 31, 1783, by William Herschel. It was again observed by Friedrich Struve in 1825 and by Otto Str…

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A white dwarf is a very dense type of star: in an Earth-sized volume, it packs a mass that is comparable to the Sun. A white dwarf radiates light from residual heat and eventual crystallization, not from nuclear fusion. Stars like the Sun, whose mass is not high enough to collapse into a neutron star or black hole, are expected to become white dwarf stars later in their evolution. The nearest known white dwarf is Sirius B, at 8.6 light years, the smaller component of the Sirius binary star. In 1910, Henry Norris Russell, Edward Charles Pickering and Williamina Fleming discovered that, despite being a dim star, 40 Eridani B was of spectral type A, or white. This would become known as the fir…

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