Binary stars in fiction

A significant number of science fiction works have explored the imaginative possibilities of binary or multiple star systems. Many real stars near the Sun belong in this category. This article is about imaginary binary and multiple star systems in science fiction.

Binary and multiple stars

Binary stars

Artist's impression of the view from a (hypothetical) moon of planet HD 188753 Ab (upper left), which orbits in a triple star system. The brightest component star (A) has just set. The binary pair HD 188753 BC lingers in the sky.

A binary star is a star system consisting of two stars orbiting around their common center of mass. The brighter star is called the primary and the lesser is its companion star, or secondary. A binary star is one kind of double star : a star that resolves visually into two separate stars that are very close together as seen from the Earth; the other type of double star is an optical double, consisting of stars of significantly differing distances or velocities which merely appear near each other in the sky but are dynamically unrelated.

In astronomy, the components of binary stars are denoted by the suffixes A and B appended to the system's designation, A denoting the primary and B the secondary. The suffix AB may be used to denote the pair (for example, the binary star Alpha Centauri AB consists of the components Alpha Centauri A and Alpha Centauri B). Additional letters, such as C, D, and so on, may be used for systems with more than two stars (see graphic).[1] In cases where the binary star has a Bayer designation and is widely separated, it is possible that the members of the pair will be designated with superscripts; an example is ζ Reticuli, whose components are ζ1 Reticuli and ζ2 Reticuli (see Alien, directed by Ridley Scott). Note that, with a single exception (Honor Harrington by David Weber, below), the authors of fiction represented in this article do not follow the astronomical convention; when they name their stars at all, they give them fanciful names.

Binary stars can be classed in three types, depending on the distance between their components relative to their sizes. A contact binary is a star whose components are so close together that the outermost part of their stellar atmospheres forms a common envelope that surrounds both of them; these may eventually merge to form a single star. With semidetached binaries one component is losing mass to its companion, which may gather it in an accretion disc, and which if it gains enough mass may form a type Ia supernova (see for example, Beta Lyrae, as well as the novel 2001: A Space Odyssey by Arthur C. Clarke, below). Detached binaries have components that are more or less distant from each other (up to appreciable fractions of a light-year) and interact only gravitationally, and they may have orbital periods as long as hundreds of thousands of years (for example Proxima Centauri around Alpha Centauri AB)—a fact that adds considerably to the difficulty astronomers encounter in distinguishing true binary stars from mere optical doubles.

Although some planetary orbital configurations are dynamically impossible in binary star systems, and other orbits present serious challenges for potential biospheres because of likely extreme variations in surface temperature during different parts of the orbit (see Helliconia by Brian Aldiss, below; also see The Songs of Distant Earth by Arthur C. Clarke), it has nonetheless been estimated that 50–60% of binary stars are capable of supporting habitable terrestrial planets within stable orbital ranges.[2] Simulations have shown that the presence of a binary companion can actually improve the rate of planet formation within stable orbital zones by "stirring up" the protoplanetary disk, increasing the accretion rate of the protoplanets within (see Starship Troopers directed by Paul Verhoeven, and the Star Trek episode "Singularity", below).[2]

Multiple stars

Artist's impression of the orbits of HD 188753 A-BC, the same triple star system depicted in the graphic above from a moon's surface. This system is hierarchical.

Multiple star systems or physical multiple stars are systems of more than two stars.[3] Various multiple star systems may be called triple if they contain three stars; quadruple if they contain four stars, quintuple for five stars, and so on. These systems are smaller than open star clusters, which have more complex dynamics and typically have from 100 to 1,000 stars.[4]

Many possible configurations of small groups of stars are dynamically unstable, as eventually one star will approach another closely and be ejected from the system.[5] This instability can be avoided if the system is what Evans[6] has called hierarchical (see graphic). In a hierarchical system, the stars in the system can be divided into two smaller tightly bunched groups, each of which traverses a larger orbit around the system's center of mass. Each of these smaller groups may also be hierarchical, and so on. A good example of this is the hierarchical triple star Alpha Centauri AB-C, where the dash in AB-C indicates that AB is one subgroup, and C the other (for another example see Marune: Alastor 993 by Jack Vance, below). This is not to say that more chaotic multiple star systems do not exist: trapezia are young, unstable systems—thought to form in stellar nurseries—that quickly fragment and may eject components as galactic high velocity stars. An example of such a system is the Trapezium in the heart of the Orion nebula.[7][8] (See also "The Devil on Salvation Bluff" and the Durdane trilogy by Jack Vance, below.)

Most multiple star systems known are triple; for higher multiplicities, the number of known systems with a given multiplicity decreases exponentially with multiplicity; this was confirmed with a sample of 807 nearby stars by the astronomer A Tokovinin.[9] A similar exponential relationship holds for 41 multiplicities of real binary and multiple star systems cited in fiction, as listed in the following section.[note 1]

Real binary and multiple stars in fiction

When authors invent new worlds, they may place them in orbits around real stars that shine in the Earth's sky, but they may also invent new suns right along with the planets. Accordingly, this article is about imaginary binary and multiple stars, their planetary systems, and the works of fiction set in them. Still, since between one-third and one-half of the stars actually residing in the neighborhood of the Sun are binaries or multiples,[10][11] it is not surprising to find many of these featured in fiction as well. Works concerning real stars in binary or multiple systems are treated elsewhere, exactly like works about real single stars; for example, Sirius is a real star and a binary star, and its fiction is the subject of the article Sirius in fiction. All such stars have their own articles, for which links are provided below, along with the multiplicities of the stars:

 

There follow references to imaginary binary and multiple stars depicted as locations in space or the centers of planetary systems, categorized by genre. The items follow the usual convention that planet names are in bold face; for this article, star names are bold orange:

Literature

The writer Jack Vance is an accomplished world-builder who, 60 years ago, provided a model for the planetary romance which has been in significant use by creators of speculative fiction ever since.[12] He is further notable among science fiction authors for his frequent use of binary and multiple star systems in his stories: His worlds spin under multiple suns. His most ambitious works in this vein are the Durdane trilogy and Marune: Alastor 933, each of which is treated in detail below. His numerous less substantial explorations of the theme[13] are described briefly here:

  • "The Unspeakable McInch" (1948). Binary system: Sclerotto; the red sun, the blue sun.[14] Magnus Ridolph tracks down an enigmatic criminal mastermind.
  • "To B or Not to C or to D" (1950). Triple system: Jexieka; red giant Rouge, white Sol-like Blanche, dark companion Noir.[15] Magnus Ridolph investigates a mysterious case of vanished agricultural workers.
  • "The Devil on Salvation Bluff" (1955). Wildly chaotic quadruple system: Glory; Red Robundus, small yellow-green Urban, silver dwarf Maude, green cat’s-eye Faro.[16] Uptight colonists learn to go with the flow of kaleidoscopic random episodes of daylight and dark.
  • "The Gift of Gab" (1955). Binary system: Sabria; dull red giant Geideon, blue-green Atreus.[17] The superintendent of a pelagic mining operation abruptly disappears.
  • The Star King (1964). Binary system: red dwarf star, habitable dead star.[18] Kirth Gersen seeks out a criminal’s secret hideaway on a dead star.
  • The Green Pearl (1985). Binary system: Tanjecterly; green sun, lemon-yellow sun.[19] Aillas searches for princess Glyneth, abducted to the world Tanjecterly.
  • "The Stark" (outline for an unpublished work). Binary system: uninhabitable planets; red and blue binary.[20] A star ark bearing the remnants of humanity ranges the galaxy seeking a home.
The castle Benbuphar Strang of Sharrode under different phases of illumination
full aud  
aud  
aud  
umber  
isp  
half aud  
umber  
isp  
umber  
chill isp  
rowan  
lorn umber  
chill isp  
red rowan  
green rowan  
mirk 

Film and television

The Great Conjunction is just seconds away in the sky over Thra, from The Dark Crystal.

Games

The planet Twinsun, suspended between two stars, with a freezing cold belt of permanent twilight around its equator.

See also

Binary and multiple stars are frequently referred to as locations in space or the centers of planetary systems in fiction. For a list containing many real solitary, binary, and multiple stars and their planetary systems that appear in fiction, see Stars and planetary systems in fiction.

Notes and references

Notes

  1. The frequencies for 41 real binary and multiple star systems in fiction are: binary stars  28; triple stars  8; quadruple stars  3; quintuple stars  1; and sextuple stars  1. The frequency f  in terms of the multiplicity m is well approximated for this set of data points by the exponential function f    250e—1.12m, obtained by a linear regression on ln f against m, with Pearson's r  - 0.97, indicating a strong correlation of 97%.
  2. In the novel Nightfall, the six suns of Kalgash in the order of their appearance in the narrative are named Onos, Dovim, Trey, Patru, Tano, and Sitha.[22] The cardinal numbers 1 - 6 in the Romanian language are unu, doi, trei, patru, cinci, and şase. In the original short story the six stars are named using Greek letter names: Alpha, Beta, Gamma, Delta with the remaining not mentioned.[23]
  3. While it is far from rare in science fiction for unusual astronomical events to cast the otherwise eternally lit planets of multiple stars into unwonted darkness (see "Nightfall" by Isaac Asimov, Marune: Alastor 933 by Jack Vance, and the film Pitch Black in the article above for examples), Brian Aldiss is the only author to imagine an active agent—the black sun—rather than a chance orbital configuration as the harbinger of the night, as if, in the words of Latvian writer Anita Vanaga, "darkness [is] an inpenetrable multitude that blots out the light."[27]
  4. The 1970 translation was followed a year later by a Russian language motion picture directed by Andrey Tarkovskiy, and in 2002 by an English language picture written and directed by Steven Soderbergh.
  5. Behavior considered proper during one mode may be considered absurd or in poor taste during another. The following list displays several diurnal modes, with color swatches showing the associated quality of daylight, and examples of appropriate conduct for the mode:[37]
         Isp (swatch): A phase befitting the consummation of formal ceremonies
         Aud (swatch): A time for going forth to battle, conducting litigation, fighting a duel, collecting rent
         Umber (swatch): Persons advance their erudition and hone their special skills
         Green Rowan (swatch): A mode conducive to poetry and sentimental musing
         Red Rowan (swatch): A relaxed time, when a man may take a glass of wine in company with other men
         Chill Isp (swatch): Inspires the Rhune with a thrilling ascetic exultation; he plans great deeds and forms gallant resolves
         Mirk (swatch): When the light fails, dark deeds are done—signally including procreation through real or simulated rape
  6. Blue dwarfs can be called "dying suns" in the sense that they are theoretical late stages in the evolution of red dwarfs toward their end-state senescence as white dwarfs. Red dwarfs are very long-lived; the universe is not yet old enough for blue dwarfs to exist.[46]
  7. The Dark Crystal is unique among the works listed in this article in that the syzygy of the system's astronomical bodies is a conjunction that multiplies the suns' power, rather than an eclipse that drains the world of their light and plunges it into perilous darkness.
  8. Director Verhoeven stated that the film's satirical use of irony and hyperbole is "playing with fascism or fascist imagery to point out certain aspects of American society... of course, the movie is about 'Let's all go to war and let's all die.'"[50]
  9. Meteoroids drift in space; meteors blaze in the sky; meteorites repose on the ground. The proper term here would be meteoroids.
  10. Tri-sol = three suns.
  11. Pitch Black (every 22 years) and two of the novels described above—Nightfall (every 2049 years) by Isaac Asimov and Robert Silverberg, and Marune: Alastor 933 (Mirk every 30 days) by Jack Vance—all feature planets basking in the near perpetual daylight provided by their multiple star systems. On each, the eventual coming of the dark portends a dreadful nightmare, and the rarer the fall of night, the more terrible the demons it unleashes.
  12. A real triple star system that figures importantly in the Star Trek universe is 40 Eridani: The planet Vulcan orbits 40 Eridani A.
  13. In exterior scenes, two suns are visible in the sky of Daikūriku.
  14. Vectors relating tidal torque to Twinsun's rotation and precession. The axial distortion of the planet is exaggerated.
    The Twinsun system as described in the game Little Big Adventure, although imaginative, is physically impossible. In order for the axis of the centrally situated planet to stay aligned with the pole stars, it must track them as they circle around the sky. The only plausible mechanism that could produce this continuous reorientation is one whereby the planet is slightly stretched into a prolate spheroid, with its axial dimension entrained to the suns' motion by tidal locking. However, applying this tidal torque τ to the spinning Twinsun (angular momentum L) would cause a precession with angular velocity Ω P of the planetary axis toward the vertical, satisfying the gyroscope cross-product equation τ = Ω P × L. This is the same phenomenon that makes a spinning front bicycle wheel (L) lean away from the left (Ω P) when a balancing rider steers the handlebars counterclockwise (τ). To visualize this in the graphic, imagine that the planet is the wheel of the bike, heading down and to the right. Due to its precession, Twinsun's axis of rotation would in time align itself with the axis of revolution of the binary system, nutating like a retrograde version of a child's top spinning down, with the eventual result that every location on the planet would experience only a brief periodic immersion in the twilight zone, as it witnessed the simultaneous rising of one sun and setting of the other. Rotational dynamics aside, the planet's position midway between two attracting bodies—its suns—places it in a state of unstable equilibrium, with its potential energy at a local maximum (like a pencil balanced on its point). If it is displaced an arbitrarily small distance away from the midpoint, it will continue to move in that direction with increasing rapidity until it falls into one of the stars.

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