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ADVENT 928 ADVENT
the Alpha star of Orion we have to say “Alpha Orionis”, meaning “Alpha of Orion” – “Orionis” be-ing the genitive of Orion. Likewise, Eta of Carina is “Eta ... www.pretoria-astronomy.co.za/pdf/newsletters_august_2008 "If we want to talk about
the Alpha star of Orion we have to say “Alpha Orionis”, meaning “Alpha of Orion” – “Orionis” being
[as genitive] (O·ri·o·nis / ˌôrēˈōnis/ ) used with a preceding letter or numeral to ... Orion is outlined by the prominent stars Betelgeuse (Alpha Orionis. ... www.encyclopedia.com/doc/1O999-orion.html O·ri·on / əˈrīən/ 1. Greek Mythol. a giant and hunter who was changed into a constellation at his death. 2. Astron. a conspicuous constellation (the Hunter), said to represent a hunter holding a club and shield. It lies on the celestial equator and contains many bright stars, including Rigel, Betelgeuse, and a line of three that form Orion's belt. ∎ [as genitive] (O·ri·o·nis / ˌôrēˈōnis/ ) used with a preceding letter or numeral to designate a star in this constellation: the multiple star Theta Orionis.
RANKING STARS IN A CONSTELLATION Or, for constellations not ending in "-us," add "-is" (e.g., Orion becomes Orionis). For your convenience, the genitive case is indicated at the top of the ... homepage.mac.com/kvmagruder/bcp/aster/constellations/alpha.htm "Lift your eyes and look to the heavens: Who created all these?
He who brings out the starry host one by one, and calls them each by name. Because of his great power and mighty strength, not one of them is missing." Isaiah 40:25 Stars within a given constellation are usually ranked according to relative brightness by the Greek alphabet. The brightest star is alpha, the second-brightest beta, the third-brightest gamma, and so forth. There are some exceptions, when an especially common constellation (such as Ursa Major or Crux) is numbered according to its linear sequence, like a dot-to-dot diagram. Star names have two parts; the first is the Greek letter indicating its brightness. The second part of a star name indicates its constellation. To obtain this constellation part of the star name, the letter of the Greek alphabet which indicates a star's brightness is conjoined with the Latin genitive case of the name of the constellation. For example, the brightest star of the constellation Centaurus is "alpha-Centauri," which happens to be the star nearest to our own Sun (though it is actually a multiple star system). "Centauri" is the Latin genitive case of "Centaurus." In general, the genitive case is obtained by changing the suffix "-us" to "-i," (e.g., Taurus becomes Tauri). Or, for constellations not ending in "-us," add "-is" (e.g., Orion becomes Orionis).
As to why it's Orionis rather than Orion, etc.—these are just the genitive (possessive) cases of the Latin names/words for the constellations. ... www.astro.cornell.edu/research/projects/CAS/faq.html Cornell Astronomical Society 7) What do these names like "Delta Orionis" mean? Why is it "Orionis" and not "Orion?"
Some stars have their own proper names, like Rigel (in Orion), Vega (in Lyra), or Polaris (in Ursa Minor). These are either prominent, bright stars, or they occupy particular places in the constellations. (For example, two fun star names are Zubenelgenubi and Zubeneschamali, Arabic names meaning "The Southern Claw" and "The Northern Claw," respectively; the stars are in Libra, the Balance. Libra used to be part of Scorpius, the Scorpion; these stars were its two claws.) Most stars, however, don't have special names. For those such stars visible to the eye, we use a system developed by Johann Bayer in the 17th century. He ranked stars in constellations in order from brightest to dimmest, using letters of the Greek alphabet: Alpha is the brightest star of a constellation, Beta the second brightest, etc. When the Greek alphabet has been exhausted, numbers are used. This latter system was devised by the 17th century British astronomer John Flamsteed, who assigned numbers even to stars that Bayer had given letter designations; most people only use the Flamsteed numbers for stars that do not have proper names or Greek letters. As to why it's Orionis rather than Orion, etc.—these are just the genitive (possessive) cases of the Latin names/words for the constellations. Thus, "Delta Orionis" is "4th brightest star of the constellation Orion." While you need to learn Latin for the details (and it's very useful to know Latin, so you should consider it!), for nearly all the constellations the rules are: 1) if the name ends in "a" (Lyra, Andromeda,...), the genitive will end in "ae" (Lyrae, Andromedae,...); 2) if the name ends in "us" or "um" (Cygnus, Cepheus, Scutum,...), the genitive will end in "i" (Cygni, Cephei, Scuti,...); 3) anything else (Orion, Virgo,...) is likely a "3rd declension noun," which indicates a sort of kitchen-sink situation re whether/how the base portion of the noun changes—simple answer is, memorize the genitive versions.
9 Jun 2008 ... is designated R followed by the genitive of the constellation name (eg. ... At maximum light, FU Orionis stars are of spectral type A - G after which the spectral ... For more information, see: Orion variable stars ...
Variable star - encyclopedia - Citezendium FU Orionis stars Named after the prototype of this class, FU Orionis (GCVS code: FU), these stars are characterized by a slow outburst in which the brightness of the star increases up to 6 magnitudes over a number of months and stays at maximum brightness for up to several years after which a slow decline sets in that dims the star by a couple of magnitudes. During an outburst the spectral type of the stars can change significantly and an emission spectrum develops as well. At maximum light, FU Orionis stars are of spectral type A - G after which the spectral type becomes later. All FU Orionis stars are associated with reflecting nebulae.[2][3] FU Orionis stars are pre-main sequence stars somewhat similar to T Tauri stars. The prototype was first discovered in 1939 by A. Wachmann when the star increased some 100-fold in brightness. FU Orionis was studied in depth by George Herbig in the 1960s and 1970s.[2] There are some 10 stars known of this type.
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Daily Mail Monday February 23, 2009 ANSWERS TO CORRESPONDENTS Compiled by Charles Legge Page 57 ORION, the giant huntsman of Greek mythology whom Zeus placed among the stars as the constellation, has three stars of apparently similar brightness and colour (bluish-white) in his belt, given the Arabic names (from left to right) Alnitak, Alnilam and Mintaka. In fact, Alnitak is 800 light years away from us, Alnilam 1,300 light years and Mintaka 900 light years. They appear in a straight line only in our line of sight. It's believed the three stars, and several other equally hot and luminous stars in the constellation Orion, were formed together as a close cluster. The passage of time has seen them drift apart. Such luminous stars use up hydrogen at a prodigious rate so they're only a few million years old and have no more than a few million years to live before blowing themselves up in a supernova explosion. These timescales are short in astronomical terms. Our Sun, with its far lower luminosity and lower fuel consumption, has shone for five billion years and is expected to shine steadily for the same amount of time before it, too, dies, in a much more sedate fashion than a supernova explosion. The five billion years that our Sun has been around has meant that life has had time to develop on one of its planets — Earth. Norman Wallace, Sutton Coldfield, W Mids.
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ALNITAK (Zeta Orionis). With brilliant Betelgeuse and Rigel dominating great Orion, we pay little heed to the individual stars of the Hunter's belt except ... www.astro.uiuc.edu/~kaler/sow/alnitak.html
ALNITAK (Zeta Orionis). With brilliant Betelgeuse and Rigel dominating great Orion, we pay little heed to the individual stars of the Hunter's belt except as a group, the trio the Arabs called the "string of pearls." All second magnitude, Johannes Bayer seems to have named the stars Delta, Epsilon, and Zeta from right to left. The name of the left hand star, Alnitak (Zeta Orionis), stands in for the whole string, and comes from a phrase that means "the belt of al jauza," "al jauza" the Arabs female "central one." Separate Alnitak from the belt and it becomes a most remarkable star in its own right, the brightest class O star in the sky, a hot blue supergiant. Tucked right next to it is a companion, a blue class B hydrogen-fusing star about three seconds of arc away, the pair orbiting each other with a period estimated to be thousands of years long. The region around Alnitak is remarkable as well, containing several dusty clouds of interstellar gas, including the famed "Horsehead Nebula" to the south. Alnitak approaches first magnitude even though at a distance of 800 light years. To the eye (ignoring the companion), it is 10,000 times more luminous than the Sun. However, its 31,000 Kelvin surface radiates mostly in the ultraviolet where the eye cannot see, and when that it taken into account, Alnitak's luminosity climbs to 100,000 times solar. A planet like the Earth would have to be 300 times farther from Alnitak than Earth is from the Sun (8 times Pluto's distance) for life like ours to survive. Such brilliance can only come from a star of great mass, Alnitak's estimated to be about 20 times solar (its dimmer companion's about 14 times solar). Like all O stars, Alnitak is a source of X-rays that seem to come from a wind that blows from its surface at nearly 2000 kilometers per second, the X- rays produced when blobs of gas in the wind crash violently into one another. Massive stars use their fuel quickly and do not live very long. Alnitak is probably only about 6 million years old (as opposed to the Sun's 4.5 billion year age) and it has already begun to die, hydrogen fusion having ceased in its core. The star will eventually become a red supergiant somewhat like Betelgeuse and almost certainly will explode as a supernova, leaving its companion orbiting a hot, madly spinning neutron star. (Thanks to Monica Shaw, who helped research this star.) Written by Jim Kaler. Return to STARS.
ALNILAM (Epsilon Orionis). Three brilliant stars mark the belt of Orion the Hunter, from right to left (west to east) Mintaka, Alnilam, and Alnitak. ... www.astro.uiuc.edu/~kaler/sow/alnilam.html
ALNILAM (Epsilon Orionis). Three brilliant stars mark the belt of Orion the Hunter, from right to left (west to east) Mintaka, Alnilam, and Alnitak. The names of all three refer to the whole set. The outer two are named after the "belt" of the Arabs "Central One (a mysterious feminine figure), while Alnilam comes from an Arabic word that aptly means "the String of Pearls," which the trio so well represents. The brightest of the Belt stars (which Bayer lettered in alphabetic order, again from right to left, Delta, Epsilon, and Zeta), and ranking fourth in the whole constellation, Alnilam shines at bright second magnitude (1.70). Though all three stars have similar colors, classes, and temperatures, Alnilam, a hot B (B0) bright supergiant, is notably the most luminous: it is brightest even though farthest away, half again farther than the other two (which lie at nearly the same distance, about 870 light years). From Alnilam's measured (though rather uncertain) distance of 1340 light years, it spectacularly radiates (after correction for its great amount of ultraviolet light) 375,000 solar luminosities from its 25,000 Kelvin surface, and is so hot that it illuminates its own (faint) nebulous cloud from the surrounding interstellar gases. Alnilam has served for many years as a "standard star" against which to compare others. Its brilliant blue and relatively simple spectrum also provides a fine background against which to study the gases of the intervening interstellar space. Like most supergiants, Alnilam is losing mass. A powerful wind blows from the star's surface at speeds up to 2000 kilometers per second, the flow rate two millionths of a solar mass per year (20 million times that from the Sun). Though seemingly single, which disallows direct measure of mass by means of a double-star orbit, the luminosity tells of an evolving star with a mass some 40 times solar. Currently only 4 or so million years old, its internal hydrogen fusion is shutting down, if it has not done so already. The star will shortly turn into a magnificent red supergiant far more luminous than nearby (on the sky) Betelgeuse, its only fate someday to explode. Written by Jim Kaler. Return to STARS.
MINTAKA (Delta Orionis). Orion is defined by his great belt, three bright second magnitude stars in a row that the ancient Arabs called "the string of ... www.astro.uiuc.edu/~kaler/sow/mintaka.html
MINTAKA (Delta Orionis). Orion is defined by his great belt, three bright second magnitude stars in a row that the ancient Arabs called "the string of pearls," which is the meaning of the name of the middle star, Alnilam. The two flanking stars, eastern Alnitak and western Mintaka, both come from Arabic phrases that mean "the belt of the Central One," the Central One the Arabic personification of our Orion, a woman lost to history. Though (at magnitude 2.21) Mintaka is the seventh brightest star in Orion, and the faintest of the three belt stars, it still received the Delta designation from Bayer, who lettered the belt stars in order from west to east before dropping down to Orion's lower half to continue the process. Of the sky's brightest stars, first through third magnitude, Mintaka is closest to the celestial equator, only a quarter of a degree to the south, the star rising and setting almost exactly east and west. The star is wonderfully complex. A small telescope shows a seventh magnitude companion separated by almost a minute of arc. At Mintaka's distance of 915 light years (very nearly the same as Alnitak at the eastern end of the belt), the faint companion orbits at least a quarter of a light year from the bright one. In between is a vastly dimmer 14th magnitude component. The bright star we call Mintaka (whose solo magnitude is 2.23) is ALSO double, and consists of a hot (30,000 Kelvin) class B, slightly evolved, giant star and a somewhat hotter class O star, each radiating near 90,000 times the solar luminosity (after correction for a bit of interstellar dust absorption), each having masses somewhat over 20 times the solar mass. This pair is too close to be separated directly. The duplicity is known through the star's spectrum (its rainbow of light), which detects two stars orbiting each other every 5.73 days, and also because the stars slightly eclipse each other, causing a dip of about 0.2 magnitudes. Mintaka is most famed. however, as a background against which the thin gas of interstellar space was first detected, when the German astronomer Johannes Hartmann in 1904 discovered absorptions in the star's spectrum that could not be produced by the orbiting pair. From this discovery, and others that followed, we now know that all of the Galaxy's interstellar space contains an enormously complex medium of gas and dust that is the birthplace of new stars. Mintaka will also, to some distant generation of astronomers, be famed in death, as each of its components is so massive that their only fate is to explode violently as supernovae. Written by Jim Kaler. Return to STARS.
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