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  2. Stellar classification - Wikipedia

    en.wikipedia.org/wiki/Stellar_classification

    [c] [11] Some of the most massive stars lie within this spectral class. O-type stars frequently have complicated surroundings that make measurement of their spectra difficult. O-type spectra formerly were defined by the ratio of the strength of the He II λ4541 relative to that of He I λ4471, where λ is the radiation wavelength. Spectral type ...

  3. List of nearest stars by spectral type - Wikipedia

    en.wikipedia.org/wiki/List_of_nearest_stars_by...

    Below there are lists the nearest stars separated by spectral type. The scope of the list is still restricted to the main sequence spectral types: M, K, F, G, A, B and O. It may be later expanded to other types, such as S, D or C. The Alpha Centauri star system is the closest star system to the Sun.

  4. List of planet types - Wikipedia

    en.wikipedia.org/wiki/List_of_planet_types

    A class of extrasolar planets whose characteristics are similar to Jupiter, but that have high surface temperatures because they orbit very close—between approximately 0.015 and 0.5 AU (2.2 × 10 ^ 6 and 74.8 × 10 ^ 6 km)—to their parent stars, whereas Jupiter orbits its parent star (the Sun) at 5.2 AU (780 × 10 ^ 6 km), causing low ...

  5. Beta Cassiopeiae - Wikipedia

    en.wikipedia.org/wiki/Beta_Cassiopeiae

    Beta Cassiopeiae (β Cassiopeiae, abbreviated Beta Cas or β Cas), officially named Caph / ˈ k æ f /, [12] [13] is a Delta Scuti variable star in the constellation of Cassiopeia. It is a giant star belonging to the spectral class F2. The white star of second magnitude (+2.28 mag, variable) has an absolute magnitude of +1.3 mag.

  6. Sextans - Wikipedia

    en.wikipedia.org/wiki/Sextans

    Alpha Sextantis is the brightest star in the constellation and the only star above the fifth magnitude with an apparent magnitude of 4.49. It is an ageing A-type star of spectral class A0 III [7] located 280 ± 20 light-years away [8] from the Solar System. At the age of 385 million years, [9] it is exhausting hydrogen at its core and leaving ...

  7. List of O-type stars - Wikipedia

    en.wikipedia.org/wiki/List_of_O-type_stars

    Star system ← ← Median distance () Stars in system Spectral type Apparent magnitude (V) Comments and references Zeta Ophiuchi: 440 ± 40: 1: O9.5 V: 2.56 – 2.58

  8. Subdwarf - Wikipedia

    en.wikipedia.org/wiki/Subdwarf

    A subdwarf, sometimes denoted by "sd", is a star with luminosity class VI under the Yerkes spectral classification system. They are defined as stars with luminosity 1.5 to 2 magnitudes lower than that of main-sequence stars of the same spectral type. On a Hertzsprung–Russell diagram subdwarfs appear to lie below the main sequence. [a]

  9. van Maanen 2 - Wikipedia

    en.wikipedia.org/wiki/Van_Maanen_2

    Any planets orbiting within this radius would have been engulfed in the star's extent. [30] The stellar classification of Van Maanen 2 is DZ8, having a helium atmosphere with a significant presence of heavier elements in its spectrum – what astronomers term metals. [31] Indeed, this star is the prototype (archetype in practice) for DZ white ...