List Of X-ray Pulsars
This is a partial list of known accretion-powered pulsars, as of 1997. LMXB IMXB HMXB BeXB See also * Lists of astronomical objects References Observations of Accreting Pulsars Bildsten, L., et al., 1997, Astrophysical Journal Supplement Series, 113, p. 367 {{Neutron star +List of X-ray pulsars *List of X-ray pulsars * X-ray pulsars X-ray pulsars or accretion-powered pulsars are a class of astronomical objects that are X-ray sources displaying strict periodic variations in X-ray intensity. The X-ray periods range from as little as a fraction of a second to as much as several m ...

Stellar Classification
In astronomy, stellar classification is the classification of stars based on their stellar spectrum, spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a Prism (optics), prism or diffraction grating into a spectrum exhibiting the Continuum (spectrum), rainbow of colors interspersed with spectral lines. Each line indicates a particular chemical element or molecule, with the line strength indicating the abundance of that element. The strengths of the different spectral lines vary mainly due to the temperature of the photosphere, although in some cases there are true abundance differences. The ''spectral class'' of a star is a short code primarily summarizing the ionization state, giving an objective measure of the photosphere's temperature. Most stars are currently classified under the Morgan–Keenan (MK) system using the letters ''O'', ''B'', ''A'', ''F'', ''G'', ''K'', and ''M'', a sequence from the hottest (''O'' type) to the coo ...
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Vela X-1
Vela or Velas may refer to: Astronomy * Vela (constellation), a constellation in the southern sky (the Sails) ** Vela (Chinese astronomy) ** Vela Pulsar ** Vela X-1, a pulsing, eclipsing high-mass X-ray binary system Places * Vela Bluff, Antarctica *Vela, Dolj, Romania * Vela (Ilidža – Sarajevo), Bosnia and Herzegovina * Velas, Maharashtra, India Ships * '' CMA CGM Vela'', a container ship in service since 2008 * USNS ''Vela'' (T-AK-89), US Army port repair ship * ''Vela''-class submarine, of the Indian Navy ** INS ''Vela'' (S40), in service 1973–2010 Technology * Project Vela, a system developed by the United States to monitor compliance with the Partial Test Ban Treaty ** Vela (satellite), a series of satellites launched by the United States to monitor nuclear testing *** Vela Incident, an international incident, in which a Vela satellite is thought to possibly have observed a nuclear test * Versatile Laboratory Aid (VELA), a data logging tool used in education Peo ...
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V0332+53
V, or v, is the twenty-second and fifth-to-last letter in the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''vee'' (pronounced ), plural ''vees''. History The letter V ultimately comes from the Phoenician letter ''waw'' by way of U. See U for details. During the Late Middle Ages, two minuscule glyphs of U developed which were both used for sounds including and modern . The pointed form "v" was written at the beginning of a word, while a rounded form "u" was used in the middle or end, regardless of sound. So whereas "valour" and "excuse" appeared as in modern printing, "have" and "upon" were printed as "haue" and "vpon". The first distinction between the letters "u" and "v" is recorded in a Gothic script from 1386, where "v" preceded "u". By the mid-16th century, the "v" form was used to represent the consonant and "u" the vowel sound, giving us the modern letter V. ...
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V635 Cas
This is a list of Motorola V series mobile phones. V60i The V60i expanded upon the hugely popular V60 model. However, the V60i was not as popular. A common problem with this model was the antenna snapping off for no particular reason. Instead of recalling the model, Motorola introduced the V60t Color, a large improvement from its predecessor (now discontinued). Recently there have been Motorola V60i models that include a non-retractable antenna that does not tend to snap off like its predecessor. The V60i for Verizon Wireless was also included with some Mercedes-Benz models in the mid-2000s, and integrated with the vehicle's COMAND infotainment system, as well as its telematics system. In these vehicles, the V60i included Mercedes-Benz branding. V101 / vBox The v101/vBox was a GSM 900/1800/1900 MHz phone, with a gray scale screen, and one of the first actual QWERTY keyboards available. It arrived and left the world of cellphones in mid and late 2002. V170-173 ''See'' ...
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4U 0115+63
4U or 4 U may refer to: Music * ''4U'' (album), by Elva Hsiao, 2002 * ''4U'' (Christina Milian EP), 2015 * ''4 U'' (Cody Simpson EP), 2010 * '' 4U: Outside'', an EP by BtoB, 2021 * "4U", a song by Aero Chord, 2015 * "4 U", a song by Korn from '' Issues'', 1999 * "4U", a song by Pi'erre Bourne from '' The Life of Pi'erre 5'', 2021 Other uses * Germanwings (IATA code), an airline * 4U, a rack unit A rack unit (abbreviated U or RU) is a unit of measure defined as . It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby th ... size * 4U, the final (4th) catalog of Uhuru x-ray sources See also * U4 (other) * For You (other) {{Letter-NumberCombDisambig ...
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A0538-67
A, or a, is the first Letter (alphabet), letter and the first vowel of the Latin alphabet, Latin alphabet, used in the English alphabet, modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is English alphabet#Letter names, ''a'' (pronounced ), plural English alphabet#Letter names, ''aes''. It is similar in shape to the Greek alphabet#History, Ancient Greek letter alpha, from which it derives. The Letter case, uppercase version consists of the two slanting sides of a triangle, crossed in the middle by a horizontal bar. The lowercase version can be written in two forms: the double-storey a and single-storey ɑ. The latter is commonly used in handwriting and fonts based on it, especially fonts intended to be read by children, and is also found in italic type. In English grammar, "English articles, a", and its variant "English articles#Indefinite article, an", are Article (grammar)#Indefinite article, indefinite arti ...
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Be Star
Be stars are a heterogeneous set of stars with B spectral types and emission lines. A narrower definition, sometimes referred to as ''classical Be stars'', is a non-supergiant B star whose spectrum has, or had at some time, one or more Balmer emission lines. Definition and classification Many stars have B-type spectra and show hydrogen emission lines, including many supergiants, Herbig Ae/Be stars, mass-transferring binary systems, and B stars. It is preferred to restrict usage of the term Be star to non-supergiant stars showing one or more Balmer series lines in emission. These are sometimes referred to as classical Be stars. The emission lines may be present only at certain times. Although the Be type spectrum is most strongly produced in class B stars, it is also detected in O and A shell stars, and these are sometimes included under the "Be star" banner. Be stars are primarily considered to be main sequence stars, but a number of subgiants and giant stars are also inc ...
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Way 977
Way may refer to: Paths * a road, route, path or pathway, including long-distance paths. * a straight rail or track on a machine tool, (such as that on the bed of a lathe) on which part of the machine slides * Ways, large slipway in shipbuilding, the ramps down which a ship is pushed in order to be launched * Way (vessel), a ship's speed or momentum Religion *"The Way", New Testament term for Christianity *Tao (Chinese: "The Way" 道), a philosophical concept (cf. Taoism) * ''Way'', plural '' Wayob'', spirit companions appearing in mythology and folklore of Maya peoples of the Yucatán Peninsula Places * Lake Way, a dry lake in Western Australia * Way, Mississippi * Way, St Giles in the Wood, historic estate in St Giles in the Wood, Devon Music *WAY-FM Network, a network of Christian music radio stations in the USA *WAY FM (Michigan), the tradename of a group of radio stations owned by Cornerstone University in Grand Rapids, Michigan * ''Ways'' (album) by Japanese rock band Sh ...
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GX 301-2
BP Crucis (x-ray source GX 301-2) is an X-ray binary system containing a blue hypergiant and a pulsar. System BP Crucis is considered as the optical counterpart to the X-ray source GX 301-2. The system consists of a massive hypergiant star and a neutron star in an eccentric 41.5 day orbit. The distance is likely to be between three and four thousand parsecs. It is heavily reddened and has a K-band infrared magnitude of 5.72. There is a mass transfer from the hypergiant to the pulsar which occurs via a dense accretion disc. This produces a cyclotron effect with electron energies of 37 and 48 keV. Variability The system shows both optical and x-ray variability. Although no eclipses are observed, the x-ray luminosity varies during the orbit with large x-ray flares being observed during periastron passages. The system is an optical variable showing brightness changes of up to 0.08 magnitudes at visible wavelengths. These have been attributed to ellipsoidal variation ...
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QV Nor
QV Normae, also known as Norma X-2, is a high mass X-ray binary star system in the constellation Norma. It varies between apparent magnitudes of 16.19 and 16.31. The X-ray source was first identified in the early 1970s. The nature of the system was discovered in 1978 by astronomers who aligned a visual source of a reddened hot blue-white star with the X-ray source 4U 1538 - 52. The components are a blue-white supergiant estimated to have a mass around 20 times that of the Sun and a neutron star initially estimated at around 1.4 solar masses, later revised to 0.8 solar masses. The stellar wind A stellar wind is a flow of gas ejected from the upper atmosphere of a star. It is distinguished from the bipolar outflows characteristic of young stars by being less collimated, although stellar winds are not generally spherically symmetric. D ... from the more massive star is drawn to the magnetic poles of neutron star, forming an accretion column and producing X-rays. The system ...
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4U 1538-52
4U or 4 U may refer to: Music * ''4U'' (album), by Elva Hsiao, 2002 * ''4U'' (Christina Milian EP), 2015 * ''4 U'' (Cody Simpson EP), 2010 * '' 4U: Outside'', an EP by BtoB, 2021 * "4U", a song by Aero Chord, 2015 * "4 U", a song by Korn from '' Issues'', 1999 * "4U", a song by Pi'erre Bourne from ''The Life of Pi'erre 5'', 2021 Other uses * Germanwings (IATA code), an airline * 4U, a rack unit size * 4U, the final (4th) catalog of Uhuru x-ray sources See also * U4 (other) * For You (other) For You may refer to: Albums * ''For You'' (Casey Donovan album), or the title song, 2004 * ''For You'' (Frankmusik album), 2015 * ''For You'' (Selena Gomez album), 2014 * ''For You'' (Eddie Kendricks album), 1974 * ''For You'' (Philipp Kirk ...

4U 1907+09
4U or 4 U may refer to: Music * ''4U'' (album), by Elva Hsiao, 2002 * ''4U'' (Christina Milian EP), 2015 * ''4 U'' (Cody Simpson EP), 2010 * '' 4U: Outside'', an EP by BtoB, 2021 * "4U", a song by Aero Chord, 2015 * "4 U", a song by Korn from '' Issues'', 1999 * "4U", a song by Pi'erre Bourne from ''The Life of Pi'erre 5'', 2021 Other uses * Germanwings (IATA code), an airline * 4U, a rack unit size * 4U, the final (4th) catalog of Uhuru x-ray sources See also * U4 (other) * For You (other) For You may refer to: Albums * ''For You'' (Casey Donovan album), or the title song, 2004 * ''For You'' (Frankmusik album), 2015 * ''For You'' (Selena Gomez album), 2014 * ''For You'' (Eddie Kendricks album), 1974 * ''For You'' (Philipp Kirk ...