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AI Velorum
AI Velorum is a variable star in the southern constellation of Vela (constellation), Vela, abbreviated AI Vel. It is a prototype for a class of high amplitude Delta Scuti variables. The apparent visual magnitude of this star fluctuates around 6.56, which is just bright enough to be dimly visible to the naked eye. The distance to AI Vel is approximately 327 light years based on stellar parallax, parallax measurements, and it is drifting further away with a radial velocity of about 9 km/s. The variability of this star was announced by Ejnar Hertzsprung, E. Hertzsprung in 1931. He found a period of about , although he later found that period doubtful. In 1937, Francesco Zagar, F. Zagar found irregular variations in the light curve. Thèodore Walraven, T. Walraven classified it as an RR Lyrae star in 1952 and suggested it may have two periods that Wave interference, interfered with each other. The primary period was found to be while the secondary is ; together the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Delta Scuti Variables
A Delta Scuti variable (sometimes termed dwarf cepheid when the V-band amplitude is larger than 0.3 mag.) is a subclass of young pulsating star. These variables as well as classical cepheids are important standard candles and have been used to establish the distance to the Large Magellanic Cloud, globular clusters, open clusters, and the Galactic Center. The variables follow a period-luminosity relation in certain passbands like other standard candles such as Cepheids. SX Phoenicis variables are generally considered to be a subclass of Delta Scuti variables that contain old stars, and can be found in globular clusters. SX Phe variables also follow a period-luminosity relation. One last sub-class are the pre-main sequence (PMS) Delta Scuti variables. The OGLE and MACHO surveys have detected nearly 3000 Delta Scuti variables in the Large Magellanic Cloud. Typical brightness fluctuations are from 0.003 to 0.9 magnitudes in V over a period of a few hours, although the amplitude ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
