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LH54-425
LH 54-425 is a spectroscopic binary star system in the LH 54 OB association within the Large Magellanic Cloud in the constellation Dorado. Discovery and visibility The OB association LH 54 was catalogued by astronomers Lucke and Hodge in 1970, listed as containing 18 member stars. It is associated with NGC 1955, part of the N51 HII region. The brightness and colour of LH 54-425 were measured in 1974. In 1996 M.S. Oey determined that LH 54-425 has an apparent magnitude, apparent (visual) magnitude of 13.13 and classified it as an O-type star, O3-class giant star, giant. A series of photometric and spectroscopic observations carried out by P. Ostrov between from 1998 to 2001 revealed that LH 54-425 varied very slightly with a regular period of 2.2475 days due to distorted stars in a close binary system composed by an O-type star, O3 class giant star, giant and an approximately O5 class companion. The masses of the two stars were estimated at and . A derivation of the orbit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
O-type Star
An O-type star is a hot, blue-white star of spectral type O in the Yerkes classification system employed by astronomers. They have temperatures in excess of 30,000 kelvin (K). Stars of this type have strong absorption lines of ionised helium, strong lines of other ionised elements, and hydrogen and neutral helium lines weaker than spectral type B. Stars of this type are very rare, but because they are very bright, they can be seen at great distances and four of the 90 brightest stars as seen from Earth are O type.Those four stars are Gamma Velorum, Alnitak (Zeta Orionis), Mintaka (Delta Orionis), and Zeta Puppis. Due to their high mass, O-type stars end their lives rather quickly in violent supernova explosions, resulting in black holes or neutron stars. Most of these stars are young massive main sequence, giant, or supergiant stars, but the central stars of planetary nebulae, old low-mass stars near the end of their lives, also usually have O spectra. O-type stars are typical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
