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List Of White Dwarfs
This is a list of exceptional white dwarf stars. Firsts These were the first white dwarfs discovered fitting these conditions Extremes These are the white dwarfs which are currently known to fit these conditions Nearest Notes *SDSS J1228+1040, A white dwarf with disk of debris. References See also * Lists of astronomical objects * Lists of stars {{star White dwarfs A white dwarf is a stellar core remnant composed mostly of electron-degenerate matter. A white dwarf is very dense: its mass is comparable to the Sun's, while its volume is comparable to the Earth's. A white dwarf's faint luminosity comes fro ... *list ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
White Dwarf
A white dwarf is a stellar core remnant composed mostly of electron-degenerate matter. A white dwarf is very dense: its mass is comparable to the Sun's, while its volume is comparable to the Earth's. A white dwarf's faint luminosity comes from the emission of residual thermal energy; no fusion takes place in a white dwarf. The nearest known white dwarf is at 8.6 light years, the smaller component of the Sirius binary star. There are currently thought to be eight white dwarfs among the hundred star systems nearest the Sun. The unusual faintness of white dwarfs was first recognized in 1910. The name ''white dwarf'' was coined by Willem Luyten in 1922. White dwarfs are thought to be the final evolutionary state of stars whose mass is not high enough to become a neutron star or black hole. This includes over 97% of the other stars in the Milky Way. After the hydrogen- fusing period of a main-sequence star of low or medium mass ends, such a star will expand to a red gi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Light Year
A light-year, alternatively spelled light year, is a large unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (), or 5.88 trillion miles ().One trillion here is taken to be 1012 (one million million, or billion in long scale). As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year (365.25 days). Because it includes the time-measurement word "year", the term ''light-year'' is sometimes misinterpreted as a unit of time. The ''light-year'' is most often used when expressing distances to stars and other distances on a galactic scale, especially in non-specialist contexts and popular science publications. The unit most commonly used in professional astronomy is the parsec (symbol: pc, about 3.26 light-years) which derives from astrometry; it is the distance at which one astronomical unit subtends an angle of one second of arc. Defi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Procyon B
Procyon () is the brightest star in the constellation of Canis Minor and usually the eighth-brightest star in the night sky, with an apparent visual magnitude of 0.34. It has the Bayer designation α Canis Minoris, which is Latinized to Alpha Canis Minoris, and abbreviated α CMi or Alpha CMi, respectively. As determined by the European Space Agency ''Hipparcos'' astrometry satellite, this system lies at a distance of just , and is therefore one of Earth's nearest stellar neighbors. A binary star system, Procyon consists of a white-hued main-sequence star of spectral type F5 IV–V, designated component A, in orbit with a faint white dwarf companion of spectral type DQZ, named Procyon B. The pair orbit each other with a period of 40.84 years and an eccentricity of 0.4. Observation Procyon is usually the eighth-brightest star in the night sky, culminating at midnight on 14 January. It forms one of the three vertices of the Winter Triangle asterism, in co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HD 49798
HD 49798 is a binary star in the constellation Puppis about 650 parsecs from Earth. It has an apparent magnitude of 8.3, making it one of the brightest known O class subdwarf stars. HD 49798 was discovered in 1964 to be a rare hydrogen-deficient O class subdwarf, and was the brightest known at the time. This was identified as a binary star, but the companion could not be detected visually or spectroscopically. The X-ray source RX J0648.0-4418 was discovered close to HD 49798's location in the sky. Only the space telescope XMM-Newton was able to identify the source. It is a white dwarf with about 1.3 solar masses, in orbit about HD 49798 and rotating once every 13 seconds. This is detected from the 13-second X-ray pulse, which results from 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 g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Z Andromedae
Z Andromedae is a binary star system consisting of a red giant and a white dwarf. It is the prototype of a type of cataclysmic variable star known as symbiotic variable stars or simply Z Andromedae variables. The brightness of those stars vary over time, showing a ''quiescent'', more stable phase and then an ''active'' one with a more pronounced variability and stronger brightening and/or dimming. Binary system Z Andromedae is a binary star system. The two components have a circular orbit that takes 759 days to complete. The red giant is around twice the mass of the sun and 880 times its luminosity, but its effective temperature is only 2,800 K. The white dwarf is around a thousand times the luminosity of the sun during the quiescent phase, but up to 10 times more luminous during the active phases. Its temperature is as high as 150,000 K when quiescent, but drops below 100,000 K when active. It also spins around its rotation axis every 1,682 seconds and displays a stro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SDSS J091709 , a school in Delta, British Columbia, Canada
{{disambiguation ...
SDSS may refer to: * Sloan Digital Sky Survey, a major multi-filter imaging and spectroscopic redshift survey * Social Democratic Party of Slovakia * Spatial Decision Support System, a GIS based decision aiding system * Independent Democratic Serb Party, a political party of Croatian Serbs (''Samostalna demokratska srpska stranka'' in Serbo-Croatian) * South Delta Secondary School South Delta Secondary (SDSS) is a public high school in Tsawwassen, British Columbia, Canada. There are approximately 1,500 students enrolled in each grade 8 through 12 (as of 2019/2020). Graduation rates in the years 2005 to 2010 vary between 9 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ZTF J1901+1458
ZTF J1901+1458 (nicknamed Z; formally ZTF J190132.9+145808.7; Gaia ID 4506869128279648512) is a white dwarf, about 135 light years away roughly in the direction of Epsilon Aquilae, discovered by the Zwicky Transient Facility circa 2021. It is the most massive white dwarf yet found, having 1.35 times the mass of the Sun, nearly the largest expected mass for this type of object. Its radius is about , about the size of Earth's Moon, and it rotates once every 7 minutes. The object's extreme rate of spin is hard to explain without supposing Z to be the result of a white dwarf merger, near the upper mass limit of a stable end product. Larger white dwarf mergers could be another mechanism of supernova production, which is not necessarily taken into account in how we have traditionally inferred dark energy In physical cosmology and astronomy, dark energy is an unknown form of energy that affects the universe on the largest scales. The first observational evidence for its existence c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RE J0317-853
Re or RE may refer to: Geography * Re, Norway, a former municipality in Vestfold county, Norway * Re, Vestland, a village in Gloppen municipality, Vestland county, Norway * Re, Piedmont, an Italian municipality * Île de Ré, an island off the west coast of France ** Le Bois-Plage-en-Ré, a commune on that island * Re di Anfo, a torrent (seasonal stream) in Italy * Re di Gianico, Re di Niardo, Re di Sellero, and Re di Tredenus, torrents in the Val Camonica * Réunion (ISO 3166-1 code), a French overseas department and island in the Indian Ocean Music * Re, the second syllable of the scale in solfège ** Re, or D (musical note), the second note of the musical scale in ''fixed do'' solfège * Re: (band), a musical duo based in Canada and the United States Albums * ''Re'' (Café Tacuba album) * ''Re'' (Les Rita Mitsouko album) * ''Re.'' (Aya Ueto album) * ''Re:'' (Kard EP) Other media * Resident Evil, popular video game franchise of survival horror * ''...Re'' (film), a 2016 I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PSR J2222-0137
PSR may refer to: Organizations * Pacific School of Religion, Berkeley, California, US * Palestinian Center for Policy and Survey Research * Physicians for Social Responsibility, US ;Political parties: * Revolutionary Socialist Party (Portugal) (''Partido Socialista Revolucionário'') * Romanian Socialist Party (present-day) Places * Abruzzo Airport (IATA airport code), near Pescara, Italy * Pasir Ris MRT station (MRT station abbreviation), Singapore * Pioneer Scout Reservation, a Boy Scout camp in Ohio, US Science and technology * Pulsar, a kind of star * Primary radar * Perimeter surveillance radar * Posthumous sperm retrieval from dead men Computing * PHP Standard Recommendation * Predictive state representation of a system * Problem Steps Recorder, psr.exe, a Microsoft utility * Panel Self-Refresh in Embedded DisplayPort Law enforcement and military * US Precision Sniper Rifle *PSR-90, a Pakistani Precision Sniper Rifle Other uses * Portuguese Sign Language (ISO 639-3 lang ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LSPM J1403+4533
Ambri Airport, french: Aéroport de Ambri, it, Aeroporto di Ambrì ( :ICAO: LSPM) is a Swiss general aviation airport. It located near the village of Ambrì, in the municipality of Quinto, canton of Ticino. Ambri serves the surrounding area and is home to a gliding school, a helicopter base and has sufficiency for VFR flying. The airport is situated in the steep-sided alpine valley of the Ticino river. It is flanked to the north by the A2 motorway and the river, and to the south by the Gotthard railway and the villages of Ambri and Piotta. History Ambri Airport began as a :Swiss Air Force base, built during World War II. It was home to the Fighter Squadron 8, whose fleet included the :EKW C-35, :Messerschmitt Bf 109, :de Havilland Vampire, :de Havilland Venom and the :Hawker Hunter. The mountains surrounding the airport housed bunkers of which were home to tactical buildings, fighter aircraft and troops. The bunkers were accessed by taxiways that passed under the A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WD 0343+247
WD 0343+247 is a white dwarf in the ecliptic constellation of Taurus. It was discovered in 1997 when examination of photographs taken for a survey of brown dwarfs in the Pleiades revealed a faint star with high proper motion. It is one of the coolest white dwarfs known, with an effective temperature The effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amount of electromagnetic radiation. Effective temperature is often used as an estimate of a body's surface temperature ... estimated to be approximately , equivalent to a spectral type of M0. Although referred to as WD 0346+246 in the discovery paper, it is more correctly designated WD 0346+247. Recent studies using NASA's Spitzer Space Telescope and MDM Observatory's 2.4-meter telescope (near Tucson, Arizona, USA) shows that this white dwarf (together with another one: SDSS J110217.48+411315.4) has a low (for white dwarfs) surface temperature betw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
