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List Of Stars That Dim Oddly
This list of stars that have unusual dimming periods is a table of stars that have been observed to darken and brighten and don't appear to be eclipsing binaries or intrinsic variables. It's based on studies searching for analogs of Tabby's Star. The listing here is ordered alphabetically. __TOC__ List See also * BD+20°307 * Disrupted planet * Ecliptic Plane Input Catalog (EPIC) * Gaia16aye * Lists of astronomical objects * List of semiregular variable stars * Lists of stars * List of variable stars * Search for extraterrestrial intelligence * WD 0145+234 WD may refer to: Arts and entertainment * ''The Walking Dead'' (TV series) * ''White Dwarf'' (magazine) Businesses and organizations Government agencies * Royal Canadian Air Force Women's Division * War Department (United Kingdom) Oth ... (star disrupting an exoasteroid) References External links SIMBAD Astronomical Databaseby the Centre de données astronomiques de Strasbourg {{DEFA ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Betelgeuse
Betelgeuse is a red supergiant of spectral type M1-2 and one of the largest stars visible to the naked eye. It is usually the tenth-brightest star in the night sky and, after Rigel, the second-brightest in the constellation of Orion. It is a distinctly reddish, semiregular variable star whose apparent magnitude, varying between +0.0 and +1.6, has the widest range displayed by any first-magnitude star. At near-infrared wavelengths, Betelgeuse is the brightest star in the night sky. Its Bayer designation is α Orionis, Latinised to Alpha Orionis and abbreviated Alpha Ori or α Ori. If it were at the center of our Solar System, its surface would lie beyond the asteroid belt and it would engulf the orbits of Mercury, Venus, Earth, and Mars. Nevertheless, there are several even larger stars in the Milky Way, including supergiants like Mu Cephei and the peculiar hypergiant, VY Canis Majoris. Calculations of Betelgeuse's mass range from slightly under ten ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
KIC 4150611
KIC may represent: * The IATA airport code for Mesa Del Rey Airport * The ICAO airline code for Kiwi Travel International Airlines * The ISO 639-3 language code for Kickapoo, see ISO 639:kic * Kepler Input Catalog of stars * ketoisocaproate, the ketoacid of leucine * Korea Investment Corporation * Kansas Insurance Commissioner * Kohler International Challenge * Kobe Institute of Computing * Kashyap information criterion * Keep Islip Clean * KIC Group, the parent of Eastar Jet airline * ''Knowledge and Innovation Community'', see European Institute of Innovation and Technology The European Institute of Innovation and Technology (EIT) is an independent body of the European Union with juridical personality, established in 2008 intended to strengthen Europe's ability to innovate. The EIT is an integral part of Horizon ... See also * KICS {{dab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Circumstellar Disc
A circumstellar disc (or circumstellar disk) is a torus, pancake or ring-shaped accretion disk of matter composed of gas, dust, planetesimals, asteroids, or collision fragments in orbit around a star. Around the youngest stars, they are the reservoirs of material out of which planets may form. Around mature stars, they indicate that planetesimal formation has taken place, and around white dwarfs, they indicate that planetary material survived the whole of stellar evolution. Such a disc can manifest itself in various ways. Young star According to the widely accepted model of star formation, sometimes referred to as the nebular hypothesis, a young star (protostar) is formed by the gravitational collapse of a pocket of matter within a giant molecular cloud. The infalling material possesses some amount of angular momentum, which results in the formation of a gaseous protoplanetary disc around the young, rotating star. The former is a rotating circumstellar disc of dense gas and dus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
KH 15D
KH 15D (V582 Monocerotis), described as a winking star because of its unusual dips in brightness, is a binary T Tauri star system embedded in a circumbinary disk. It is a member of the young open cluster NGC 2264, located about from the Sun in the constellation of Monoceros. Discovery The unique brightness variations of KH 15D were discovered at Wesleyan University's Van Vleck Observatory in 1995 by Dr. William Herbst and his then-master's student Kristin Kearns. The star was found to alternate, on a 48.37-day period between a brighter "on" state and a fainter "off" state that was less than 4% of the bright state (or up to 96% dimmed). As the years went by, the star spent more and more time "off", such that by 2010 it was always in the faint state, although still periodically variable. In 2012 it unexpectedly began to "wink" on and off again and has now entered a phase where its "on" state is almost twice as bright as it was in the mid-1990s (see light curve). Hypothe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HD 139139
HD 139139 (also known as EPIC 249706694) is likely part of a bound pair system of main sequence stars about away from Earth in the constellation Libra. HD 139139 is a G-type main-sequence star, a little larger and more luminous than the Sun, and at an almost identical temperature. It has an apparent magnitude of 9.8. The companion star is thought to be a K5-7 red dwarf away from HD 139139. It is about three magnitudes fainter and has a temperature of between 4,100 and . Both stars have a similar proper motion, meaning they may form a gravitationally-bound binary pair. HD 139139 exhibits dips in brightness similar to those caused by transiting Earth-like planets. The Kepler space telescope observed 28 dips in their brightness over an 87-day period (23 August – 20 November 2017). The dips do not appear to be periodic as would be expected if they were due to transiting planets. It is unknown which of the two stars produces the dimming events. Potential explana ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brown Dwarf
Brown dwarfs (also called failed stars) are substellar objects that are not massive enough to sustain nuclear fusion of ordinary hydrogen ( 1H) into helium in their cores, unlike a main-sequence star. Instead, they have a mass between the most massive gas giant planets and the least massive stars, approximately 13 to 80 times that of Jupiter (). However, they can fuse deuterium ( 2H), and the most massive ones (> ) can fuse lithium ( 7Li). Astronomers classify self-luminous objects by spectral class, a distinction intimately tied to the surface temperature, and brown dwarfs occupy types M, L, T, and Y. As brown dwarfs do not undergo stable hydrogen fusion, they cool down over time, progressively passing through later spectral types as they age. Despite their name, to the naked eye, brown dwarfs would appear in different colors depending on their temperature. The warmest ones are possibly orange or red, while cooler brown dwarfs would likely appear magenta or black to th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Giant Planet
The giant planets constitute a diverse type of planet much larger than Earth. They are usually primarily composed of low-boiling-point materials (volatiles), rather than rock or other solid matter, but massive solid planets can also exist. There are four known giant planets in the Solar System: Jupiter, Saturn, Uranus and Neptune. Many extrasolar giant planets have been identified orbiting other stars. They are also sometimes called jovian planets, after Jupiter ("Jove" being another name for the Roman god "Jupiter"). They are also sometimes known as gas giants. However, many astronomers now apply the latter term only to Jupiter and Saturn, classifying Uranus and Neptune, which have different compositions, as ice giants. Both names are potentially misleading: all of the giant planets consist primarily of fluids above their critical points, where distinct gas and liquid phases do not exist. The principal components are hydrogen and helium in the case of Jupiter and Saturn, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
EPIC 204376071
EPIC 204376071 is an M-type star in the constellation of Scorpius. Parallax measurements by the ''Gaia'' space observatory put the star at a distance of about from Earth. It is likely a member of the Upper Sco association, and is young enough that it has not yet become a main-sequence star. Unusual light fluctuations of the star, including up to an 80% dimming in brightness (i.e., "single 80% deep occultation of 1-day duration"), were observed by astronomers. The unusual dimming was not only extremely deep, but also substantially asymmetric, with an egress about twice as long as the ingress. Nonetheless, such an unusual dimming for EPIC 204376071 is much greater than the 22% dimming observed for Tabby's star. Several explanations have been presented to explain the unusual dimming of the EPIC 204376071 star: one, orbiting dust or small particles; or two, a "transient accretion event of dusty material near the corotation radius of the star". The unusual lightcurve of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Debris Disk
A debris disk (American English), or debris disc (Commonwealth English), is a circumstellar disk of dust and debris in orbit around a star. Sometimes these disks contain prominent rings, as seen in the image of Fomalhaut on the right. Debris disks are found around stars with mature planetary systems, including at least one debris disk in orbit around an evolved neutron star. Debris disks can also be produced and maintained as the remnants of collisions between planetesimals, otherwise known as asteroids and comets. By 2001, more than 900 candidate stars had been found to possess a debris disk. They are usually discovered by examining the star system in infrared light and looking for an excess of radiation beyond that emitted by the star. This excess is inferred to be radiation from the star that has been absorbed by the dust in the disk, then re-radiated away as infrared energy. Debris disks are often described as massive analogs to the debris in the Solar System. Most known de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
EPIC 204278916
EPIC 204278916 is a pre-main-sequence star, about five million years old with a spectral type of M1, implying a red dwarf. It is part of the Upper Scorpius sub-group of the Scorpius–Centaurus association, and is in the constellation Scorpius. The star is approximately the size of the Sun at , but is only half its mass () and a fraction of its luminosity (). This stellar object was first characterized by the 2nd USNO CCD Astrograph Catalog and the Two Micron All-Sky Survey, and was further studied during the ''Kepler'' space telescope's extended ''K2'' mission Campaign 2 between 23 August and 13 November 2014. Luminosity In August 2016, a team of astronomers, led by Simone Scaringi of the Max Planck Institute for Extraterrestrial Physics in Germany, reported that this red dwarf star has a resolved circumstellar disc. Further, the research team observed unusual luminosity dimmings of up to 65% for 25 consecutive days (out of 79 total observation days). The variability in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
EurekAlert!
The American Association for the Advancement of Science (AAAS) is an American international non-profit organization with the stated goals of promoting cooperation among scientists, defending scientific freedom, encouraging scientific responsibility, and supporting scientific education and science outreach for the betterment of all humanity. It is the world's largest general scientific society, with over 120,000 members, and is the publisher of the well-known scientific journal ''Science''. History Creation The American Association for the Advancement of Science was created on September 20, 1848, at the Academy of Natural Sciences in Philadelphia, Pennsylvania. It was a reformation of the Association of American Geologists and Naturalists. The society chose William Charles Redfield as their first president because he had proposed the most comprehensive plans for the organization. According to the first constitution which was agreed to at the September 20 meeting, the goal of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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