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30 relations: Anneila Sargent, B-type main-sequence star, Big Bang nucleosynthesis, Binary star, Bulge (astronomy), Constellation, Elliptical galaxy, Fritz Zwicky, Globular cluster, Helium, Hercules (constellation), Hertzsprung–Russell diagram, Horizontal branch, HW Virginis, Hydra (constellation), Hydrogen, Jesse L. Greenstein, Kepler-70, Light-year, Milton L. Humason, Pegasus (constellation), Red giant, Spherical harmonics, Spiral galaxy, Subdwarf, Subdwarf B star, V391 Pegasi, Variable star, Virgo (constellation), White dwarf.
Anneila Sargent
Professor Anneila Isabel Sargent FRSE DSc (born Anneila Cassells, 1942, Kirkcaldy) is a Scottish–American astronomer, who specializes in star formation.
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B-type main-sequence star
A B-type main-sequence star (B V) is a main-sequence (hydrogen-burning) star of spectral type B and luminosity class V. These stars have from 2 to 16 times the mass of the Sun and surface temperatures between 10,000 and 30,000 K. B-type stars are extremely luminous and blue.
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Big Bang nucleosynthesis
In physical cosmology, Big Bang nucleosynthesis (abbreviated BBN, also known as primordial nucleosynthesis, arch(a)eonucleosynthesis, archonucleosynthesis, protonucleosynthesis and pal(a)eonucleosynthesis) refers to the production of nuclei other than those of the lightest isotope of hydrogen (hydrogen-1, 1H, having a single proton as a nucleus) during the early phases of the Universe.
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Binary star
A binary star is a star system consisting of two stars orbiting around their common barycenter.
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Bulge (astronomy)
In astronomy, a bulge is a tightly packed group of stars within a larger formation.
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Constellation
A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.
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Elliptical galaxy
An elliptical galaxy is a type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless image.
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Fritz Zwicky
Fritz Zwicky (February 14, 1898 – February 8, 1974) was a Swiss astronomer.
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Globular cluster
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.
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Helium
Helium (from lit) is a chemical element with symbol He and atomic number 2.
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Hercules (constellation)
Hercules is a constellation named after Hercules, the Roman mythological hero adapted from the Greek hero Heracles.
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Hertzsprung–Russell diagram
The Hertzsprung–Russell diagram, abbreviated H–R diagram, HR diagram or HRD, is a scatter plot of stars showing the relationship between the stars' absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.
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Horizontal branch
The horizontal branch (HB) is a stage of stellar evolution that immediately follows the red giant branch in stars whose masses are similar to the Sun's.
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HW Virginis
HW Virginis, abbreviated HW Vir, is an eclipsing binary system (of the Algol type) approximately 590 light-years away (based on the stellar properties and magnitudes: the Hipparcos trigonometric parallax measurement has too high an error value to be useful) in the constellation of Virgo.
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Hydra (constellation)
Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees.
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Hydrogen
Hydrogen is a chemical element with symbol H and atomic number 1.
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Jesse L. Greenstein
Jesse Leonard Greenstein (October 15, 1909 – October 21, 2002) was an American astronomer.
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Kepler-70
Kepler-70, formerly known as KOI-55, is a star in the constellation Cygnus with an apparent visual magnitude of 14.87.
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Light-year
The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.
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Milton L. Humason
Milton La Salle Humason (August 19, 1891 – June 18, 1972) was an American astronomer.
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Pegasus (constellation)
Pegasus is a constellation in the northern sky, named after the winged horse Pegasus in Greek mythology.
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Red giant
A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses) in a late phase of stellar evolution.
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Spherical harmonics
In mathematics and physical science, spherical harmonics are special functions defined on the surface of a sphere.
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Spiral galaxy
Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae(pp. 124–151) and, as such, form part of the Hubble sequence.
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Subdwarf
A subdwarf, sometimes denoted by "sd", is a star with luminosity class VI under the Yerkes spectral classification system.
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Subdwarf B star
A B-type subdwarf (sdB) is a kind of subdwarf star with spectral type B. They differ from the typical subdwarf by being much hotter and brighter.
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V391 Pegasi
V391 Pegasi, also catalogued as HS 2201+2610, is a blue-white subdwarf star approximately 4,570 light-years away in the constellation of Pegasus.
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Variable star
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
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Virgo (constellation)
Virgo is one of the constellations of the zodiac.
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White dwarf
A white dwarf, also called a degenerate dwarf, is a stellar core remnant composed mostly of electron-degenerate matter.
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Redirects here:
B-type subdwarf, Betsy star, LPsdBV, SdB, SdB star, SdB stars, SdBV, Subdwarf B, V361 Hydrae, V361 Hydrae variable, Very rapidly pulsating subdwarf B star.
References
[1] https://en.wikipedia.org/wiki/Subdwarf_B_star
