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WR 46
WR 46 (DI Crucis) is a Wolf-Rayet star in the constellation of the Southern Cross of apparent magnitude +10.8. It is located at 55 arcmin north of Theta2 Crucis. The star is a member of the distant stellar association OB4 Cru, and is around 4,000 parsecs or 13,000 light years from the Solar System.
==Features==
WR 46 has spectral type WN3, with peculiarities in the spectrum including unusually broad emission lines. Its spectrum is characterized by the presence of strong lines of NV and HeII and the absence of hydrogen lines. It is known as a weak-lined WNE star because of the high temperature but relatively weak emission strength.
The physical parameters of WR 46 are all estimates from assumptions about the distance and models for stars of its type, complicated by the suspicion that there is a companion star. The effective temperature is over 110,000K, the luminosity greater than 600,000 times the solar luminosity (), the mass around 25 times that of the Sun () and a radius of 2.9 times the solar radius (). The terminal velocity of the stellar wind reaches 2450 km/s with a total mass loss rate of 4 × 10−6 per year.
WR 46 is a known source of X-rays, an aspect that was discovered by the Einstein Observatory. The X-ray luminosity between 0.2 and 10.0 keV is 7.7 × 1032 erg/s. Its X-ray spectrum is dominated by a soft component but there is also a hard component above 3 keV (a hard tail).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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