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112 Herculis
112 Herculis is a binary star system in the northern constellation of Hercules. It is dimly visible to the naked eye with a combined apparent visual magnitude of 5.43. The secondary component is about two magnitudes fainter than the primary star. The distance to this system is approximately 415 light years based on parallax measurements. It is drifting closer to the Sun with a radial velocity of −20 km/s. The binary character of this system was discovered by W. F. Meyer in 1926. By measuring the variation in velocity of the primary component, he determined an orbital period of 6.3624 days. K. Osawa in 1959 found a stellar classification of A4 III for the pair. W. P. Bidelman observed that the primary has unusually strong lines of ionized phosphorus, and it was assigned to the class of peculiar manganese stars by W. L. W. Sargent and L. Searle in 1962, with a resulting spectral type of B9. No evidence was found for a strong magnetic field by P. S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
112HerLightCurve
Eleven or 11 may refer to: *11 (number), the natural number following 10 and preceding 12 * one of the years 11 BC, AD 11, 1911, 2011, or any year ending in 11 Literature * ''Eleven'' (novel), a 2006 novel by British author David Llewellyn *''Eleven'', a 1970 collection of short stories by Patricia Highsmith *''Eleven'', a 2004 children's novel in The Winnie Years by Lauren Myracle *''Eleven'', a 2008 children's novel by Patricia Reilly Giff *''Eleven'', a short story by Sandra Cisneros Music *Eleven (band), an American rock band * Eleven: A Music Company, an Australian record label *Up to eleven, an idiom from popular culture, coined in the movie ''This Is Spinal Tap'' Albums * ''11'' (The Smithereens album), 1989 * ''11'' (Ua album), 1996 * ''11'' (Bryan Adams album), 2008 * ''11'' (Sault album), 2022 * ''Eleven'' (Harry Connick, Jr. album), 1992 * ''Eleven'' (22-Pistepirkko album), 1998 * ''Eleven'' (Sugarcult album), 1999 * ''Eleven'' (B'z album), 2000 * ''Eleven'' (Reamon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wallace L
Wallace may refer to: People * Clan Wallace in Scotland * Wallace (given name) * Wallace (surname) * Wallace (footballer, born 1986), full name Wallace Fernando Pereira, Brazilian football left-back * Wallace (footballer, born 1987), full name Wallace Reis da Silva, Brazilian football centre-back * Wallace (footballer, born May 1994), full name Wallace Oliveira dos Santos, Brazilian football full-back * Wallace (footballer, born October 1994), full name Wallace Fortuna dos Santos, Brazilian football centre-back * Wallace (footballer, born 1998), full name Wallace Menezes dos Santos, Brazilian football midfielder Fictional characters * Wallace, from ''Wallace and Gromit'' * Wallace (''Pokémon'') * Wallace (''Sin City'') * Wallace (''The Wire'') * Wallace Breen, from ''Half-Life 2'' * Wallace Fennel, from ''Veronica Mars'' * Wallace Footrot, from ''Footrot Flats'' * Eli Wallace, from ''Stargate Universe'' * Wallace, from " The Hangover Part III" * Wallace the Brave, from th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Am Star
An Am star or metallic-line star is a type of chemically peculiar star of spectral type A whose spectrum has strong and often variable absorption lines of metals such as zinc, strontium, zirconium, and barium, and deficiencies of others, such as calcium and scandium. The original definition of an Am star was one in which the star shows "an apparent surface underabundance of Ca (and/or Sc) and/or an apparent overabundance of the Fe group and heavier elements". The unusual relative abundances cause the spectral type assessed from the Calcium K lines to be systematically earlier than one assessed from other metallic lines. Typically, a spectral type judged solely from hydrogen lines is intermediate. This leads to two or three spectral types being given. For example, Sirius has been given a spectral type of kA0hA0VmA1, indicating that it is A0 when judged by the Calcium k line, A0V when judged by its hydrogen lines, and A1 when judged by the lines of heavy metals. There are o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tatyana A
Tatiana (or Tatianna, also romanized as Tatyana, Tatjana, Tatijana, etc.) is a female name of Sabine-Roman origin that became widespread in Eastern Europe. Variations * be, Тацця́на, Tatsiana * bg, Татяна, Tatyana * german: Tatjana * el, Τατιάνα, Tatiána * pl, Tacjana * russian: Татья́на, Tat'yána, Tatiana * sr, Татјана, Tatjana * uk, Тетя́на, Tetyána Origin Tatiana is a feminine, diminutive derivative of the Sabine —and later Latin— name Tatius. King Titus Tatius was the name of a legendary ruler of the Sabines, an Italic tribe living near Rome around the 8th century BC. After the Romans absorbed the Sabines, the name Tatius remained in use in the Roman world, into the first centuries of Christianity, as well as the masculine diminutive Tatianus and its feminine counterpart, Tatiana. While the name later disappeared from Western Europe including Italy, it remained prevalent in the Hellenic world of Eastern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Christopher Aikman
Christopher Aikman is a Canadian astrophysicist who spent most of his career (from 1968 to 2000) at the Dominion Astrophysical Observatory, National Research Council Canada in Saanich, British Columbia, Canada. Early life and education An early interest in astronomy led Aikman to join the Royal Astronomical Society of Canada Quebec Centre in 1958, at the age of 15. He received a B.Sc. from Bishop's University in 1965 and a M.Sc. from the University of Toronto in 1968. His thesis was based on microwave surveys of selected emission nebulae in the northern Milky Way made with the 46-m radio telescope of the Algonquin Radio Observatory, including the emission nebula IC1795. This revealed what is perhaps the youngest stellar object in the Galaxy, namely W3(OH), a cocoon star invisible at optical wavelengths but surrounded by a rapidly expanding ultracompact HII region, all within a dense obscuring dust shell. W3(OH) had previously been located in 1966 as the source of the fir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles R
Charles is a masculine given name predominantly found in English and French speaking countries. It is from the French form ''Charles'' of the Proto-Germanic name (in runic alphabet) or ''*karilaz'' (in Latin alphabet), whose meaning was "free man". The Old English descendant of this word was '' Ċearl'' or ''Ċeorl'', as the name of King Cearl of Mercia, that disappeared after the Norman conquest of England. The name was notably borne by Charlemagne (Charles the Great), and was at the time Latinized as ''Karolus'' (as in ''Vita Karoli Magni''), later also as '' Carolus''. Some Germanic languages, for example Dutch and German, have retained the word in two separate senses. In the particular case of Dutch, ''Karel'' refers to the given name, whereas the noun ''kerel'' means "a bloke, fellow, man". Etymology The name's etymology is a Common Germanic noun ''*karilaz'' meaning "free man", which survives in English as churl (< Old English ''ċeorl''), which developed i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mercury-manganese Star
A mercury-manganese star (also HgMn star) is a type of chemically peculiar star with a prominent spectral line at 398.4 nm, due to absorption from ionized mercury. These stars are of spectral type B8, B9, or A0, corresponding to surface temperatures between about 10,000 and 15,000 K, with two distinctive characteristics: * An atmospheric excess of elements like phosphorus, manganese, gallium, strontium, yttrium, zirconium, platinum and mercury. * A lack of a strong dipole magnetic field. Their rotation is relatively slow, and as a consequence their atmosphere is relatively calm. It is thought, but has not been proven, that some types of atoms Every atom is composed of a nucleus and one or more electrons bound to the nucleus. The nucleus is made of one or more protons and a number of neutrons. Only the most common variety of hydrogen has no neutrons. Every solid, liquid, gas, an ... sink under the force of gravity, while others are lifted towards the exterior of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lawrence H
Lawrence may refer to: Education Colleges and universities * Lawrence Technological University, a university in Southfield, Michigan, United States * Lawrence University, a liberal arts university in Appleton, Wisconsin, United States Preparatory & high schools * Lawrence Academy at Groton, a preparatory school in Groton, Massachusetts, United States * Lawrence College, Ghora Gali, a high school in Pakistan * Lawrence School, Lovedale, a high school in India * The Lawrence School, Sanawar, a high school in India Research laboratories * Lawrence Berkeley National Laboratory, United States * Lawrence Livermore National Laboratory, United States People * Lawrence (given name), including a list of people with the name * Lawrence (surname), including a list of people with the name * Lawrence (band), an American soul-pop group * Lawrence (judge royal) (died after 1180), Hungarian nobleman, Judge royal 1164–1172 * Lawrence (musician), Lawrence Hayward (born 1961), British mu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Main Sequence
In astronomy, the main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell. Stars on this band are known as main-sequence stars or dwarf stars. These are the most numerous true stars in the universe and include the Sun. After condensation and ignition of a star, it generates thermal energy in its dense core region through nuclear fusion of hydrogen into helium. During this stage of the star's lifetime, it is located on the main sequence at a position determined primarily by its mass but also based on its chemical composition and age. The cores of main-sequence stars are in hydrostatic equilibrium, where outward thermal pressure from the hot core is balanced by the inward pressure of gravitational collapse from the overlying layers. The strong dependence of the rate of energy ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mass Ratio
In aerospace engineering, mass ratio is a measure of the efficiency of a rocket. It describes how much more massive the vehicle is with propellant than without; that is, the ratio of the rocket's ''wet mass'' (vehicle plus contents plus propellant) to its ''dry mass'' (vehicle plus contents). A more efficient rocket design requires less propellant to achieve a given goal, and would therefore have a lower mass ratio; however, for any given efficiency a higher mass ratio typically permits the vehicle to achieve higher delta-v. The mass ratio is a useful quantity for back-of-the-envelope rocketry calculations: it is an easy number to derive from either \Delta or from rocket and propellant mass, and therefore serves as a handy bridge between the two. It is also a useful for getting an impression of the size of a rocket: while two rockets with mass fractions of, say, 92% and 95% may appear similar, the corresponding mass ratios of 12.5 and 20 clearly indicate that the latter syst ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Courtney E
Courtney is a name of Old French origin, introduced into England after the Norman Conquest of 1066. It has two quite distinct interpretations: firstly, the surname may be locational, from places called Courtenay in the regions of Loiret and Gâtinais. The House of Courtenay was a significant French family with close association with both the French, and thereby, English royal lines; in England the Courtenays were Earls of Devon. Secondly, in some cases, bearers of the surname may be of Irish descent, since Courtney is also an Anglicized form of the Gaelic "O'Curnain", descendant of Curnan, from an Old Irish personal name of obscure origins. Recordings of the name from London Church Registers include: the christening of Thomas Courtney at All Hallows, London Wall, on 11 November 1569, and the marriage of William Courtney and Mary Lucas on 22 March 1590, at St Dunstan's, Stepney. John Courtney and his wife, Sybill, were early immigrants to America, leaving London on the ''Paule'' i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anne Cowley
Anne Pyne Cowley is an American astronomer known for her spectroscopic observations of stars and stellar black holes, including the 1983 discovery of a likely black hole in LMC X-3, an X-ray binary star system in the Large Magellanic Cloud. This became the first known extragalactic stellar black hole, and the second known stellar black hole after Cygnus X-1. She is a professor emerita at Arizona State University. Education and career Cowley is a 1959 graduate of Wellesley College, where she became interested in astronomy after taking a general education course on the subject. She went to the University of Michigan for graduate study in astronomy, earned a Ph.D. there, and met her eventual husband, astronomer Charles R. Cowley. She continued as a researcher at the University of Chicago until 1967, when she returned to the University of Michigan as a research scientist. In 1983, she took a professorship at Arizona State University. Recognition In 1986, Wellesley College gave Cowl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
