The Summer Triangle is an asterism that includes three bright stars in the night sky: Vega, Deneb, and Altair. When I was first learning the night sky, more than 40 years ago, I spent hours, days, weeks, months poring over charts and books. This is 88% of the speed that would cause the star to start breaking up from centrifugal effects. Membership in a moving group implies a common origin for these stars in an open cluster that has since become gravitationally unbound. From Earth, Vega is observed from the direction of one of these poles. This dusty disk would be relatively young on the time scale of the star's age, and it will eventually be removed unless other collision events supply more dust. Production of the dust would require collisions between asteroids in a population corresponding to the Kuiper Belt around the Sun. The metallicity of Vega's photosphere is only about 32% of the abundance of heavy elements in the Sun's atmosphere. Sirius, in the constellation Canis Major, shines at magnitude -1.46, so has long been a well-known star to many ancient cultures. It is now so entered in the IAU Catalog of Star Names. The Summer Triangle stars in the Milky Way through Cygnus, Lyra and Aquila. [18] Vega was the first star other than the Sun to be photographed and the first to have its spectrum recorded. Lyra is easy, too, if you have a dark sky. [42] However, this is no longer the case, as the apparent magnitude zero point is now commonly defined in terms of a particular numerically specified flux. Dust would collect in orbits that have mean-motion resonances with this planet—where their orbital periods form integer fractions with the period of the planet—producing the resulting clumpiness. Thus it was suggested that Vega showed occasional low-amplitude pulsations associated with a Delta Scuti variable. Learn about the home care services available to seniors, children and adults. The three bright stars that mark the vertices of the Summer Triangle are Altair, Deneb, and Vega, the brightest stars in the constellations Aquila, Cygnus, and Lyra.The star pattern makes it easy to locate each of the three constellations. After leaving the main sequence, Vega will become a class-M red giant and shed much of its mass, finally becoming a white dwarf. Astronomy & Astrophysics is publishing the first detection of a magnetic field on the star Vega, one of the brightest stars in the sky. Vega, whose name means “the swooping eagle,” is the 5th brightest star in the night sky. With a declination of +38.78°, Vega can only be viewed at latitudes north of 51° S. Therefore, it does not rise at all anywhere in Antarctica or in the southernmost part of South America, including Punta Arenas, Chile (53° S). One possibility is that the chemical peculiarity may be the result of diffusion or mass loss, although stellar models show that this would normally only occur near the end of a star's hydrogen-burning lifespan. This apparent magnitude is a numerical value that decreases in value with increasing brightness of the star. A complete precession cycle requires 25,770 years,[30] during which time the pole of the Earth's rotation follows a circular path across the celestial sphere that passes near several prominent stars. However, continuous production of the amount of dust observed over the course of Vega's lifetime would require an enormous starting mass—estimated as hundreds of times the mass of Jupiter. robhatherton 78 robhatherton 78 Star Forming; Members; 78 192 posts; Location: Nantwich, S Cheshire; Posted June 3, 2013. (a) What time is required to send a radio signal from Earth to a planet orbiting Vega and back again? It mixes this beautiful theme with a more classic setup - the slot has just five fixed paylines available and three reels. Fixed star Vega, Alpha Lyrae, is a massive 0.0 magnitude pale sapphire star in the Handle of the Lyre, Lyra Constellation.The traditional name Vega was originally Wega, which came from Arabic word wāqi‘ which means falling or landing.This in turn comes from an-nasr al-wāqi‘ which means The Falling Eagle. Wilson in 2006 and the Infrared Optical Telescope Array at Mt. Vega is the 5th brightest star visible from Earth, and the 3rd brightest easily visible from mid-northern latitudes, after Sirius and Arcturus. Its said that when Orpheus played this harp, neither god nor mortal could turn away. This is the first such detection of a magnetic field on a spectral class A star that is not an Ap chemically peculiar star. At latitudes to the north of 51° N, Vega remains continuously above the horizon as a circumpolar star. RXJ1800, a galaxy, lies very near in the sky to the bright star Vega. For example, Sirius, the brightest star of the celestial sphere, has a Astronomers have studied Vega for thousands of years and will likely continue to do so thanks to a special role Vega plays in our sky every 25,000 years or so. [89], Observations from the James Clerk Maxwell Telescope in 1997 revealed an "elongated bright central region" that peaked at 9″ (70 AU) to the northeast of Vega. Around July 1, Vega reaches midnight culmination when it crosses the meridian at that time. Vega is the leading light of Lyra, the harp. The net proper motion of Vega is 327.78 mas/y,[78] which results in angular movement of a degree every 11,000 years. [74][75] However, the reason for the existence of such chemically peculiar, spectral class A0-F0 stars remains unclear. [47], Most of the energy produced at Vega's core is generated by the carbon–nitrogen–oxygen cycle (CNO cycle), a nuclear fusion process that combines protons to form helium nuclei through intermediary nuclei of carbon, nitrogen, and oxygen. [107], The Assyrians named this pole star Dayan-same, the "Judge of Heaven", while in Akkadian it was Tir-anna, "Life of Heaven". [22] Stars that display an infrared excess due to dust emission are termed Vega-like stars. Blue star Vega is the brightest light in the distinctive constellation Lyra the Harp. Bright star Vega on May evenings Vega is a lovely star to come to know. [14], In Chinese, 織女 (Zhī Nǚ), meaning Weaving Girl (asterism), refers to an asterism consisting of Vega, ε Lyrae and ζ1 Lyrae. The temperature gradient may also mean that Vega has a convection zone around the equator,[12][70] while the remainder of the atmosphere is likely to be in almost pure radiative equilibrium. The Sun joins Vega on January 6. [51] Also, a 2011 article affirms that "The long-term (year-to-year) variability of Vega was confirmed". [58], The energy flux from Vega has been precisely measured against standard light sources. The WGSN's first bulletin of July 2016[26] included a table of the first two batches of names approved by the WGSN; which included Vega for this star. It was shown to extend out to 43″ (330 AU) at a wavelength of 24 μm, 70″ (543 AU) at 70 μm and 105″ (815 AU) at 160 μm. Vega, Alpha Lyrae (α Lyr), is a bright white main sequence star located only 25 light years from Earth. Vega's spectral class is A0V, making it a blue-tinged white main sequence star that is fusing hydrogen to helium in its core. This causes the equator to bulge outward due to centrifugal effects, and, as a result, there is a variation of temperature across the star's photosphere that reaches a maximum at the poles. Vega: The bright star that could have a family of planets (and even its own Earth twin) Astronomers have discovered evidence of an asteroid belt surrounding the star … At present, Vega has more than twice the mass[21] of the Sun and its bolometric luminosity is about 40 times the Sun's. Vega is the brightest star in the northern constellation of Lyra. Vega is only 25 light-years from the sun and is among the most luminous stars neighboring the sun. Vega in history and myth. [68], Vega has a rotation period of 12.5 hours. [64][65], Using spectropolarimetry, a magnetic field has been detected on the surface of Vega by a team of astronomers at the Observatoire du Pic du Midi. Energy transfer is instead performed by the radiative process, which may be causing an abundance anomaly through diffusion.[77]. The brightest stars in the night sky (listed below) are either some of our nearest neighbours or highly luminous stars that lie at greater distances.Sirius, the brightest star in the Earth’s sky, lies only 8.60 light years away and is one of the nearest stars to the Sun.With twice the Sun’s mass and a radius 1.711 times solar, it is 25.4 times more luminous than the Sun. [117] Medieval star charts also listed the alternate names Waghi, Vagieh and Veka for this star.[29]. In another 14,000 years, Vega will be the North Star again. [114], In Hindu mythology, Vega is called Abhijit and is mentioned in the Mahabharata Vana Parva (Chap. It is also the brightest star located in the constellation of Lyra. The blue-white star Vega via Fred Espenak . The stars of the Summer Triangle are each part of their own constellation, Lyra, Cygnus, and Aquila. [29], Each night the positions of the stars appear to change as the Earth rotates. 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