As previously existing stellar evolution models do not extend to such high luminosities, we employ new evolutionary tracks for very massive stars to determine the initial mass and age of the Pistol Star, and estimate M initial = 200-250 M ⊙ and an age of 1.7-2.1 Myr. The models also reveal a helium enriched surface. The lower luminosity models give L = 10 6.6+/-0.2 L ⊙ and T eff = 10 4.15+/-0.01 K, while the higher luminosity models give L = 10 7.2+/-0.2 L ⊙ and T eff = 10 4.33+/-0.01 K the error in luminosity assumes an uncertainty of +/-0.5 in A K, while the error in T eff is constrained by detailed line modeling. Using our wind/atmosphere code, we find two families of models that fit the spectral energy distribution and detailed line profiles. We estimate an extinction of A K = 3.2 +/- 0.5 using the near-infrared colors of the star and of surrounding stars in the young Quintuplet cluster. –Ian V.We present new near-infrared data and analysis, which indicate that the Pistol Star is one of the most luminous stars known, adding another test point for massive star formation and stellar evolution theories. Once recoil and noise are mastered, the BKM becomes an extension of the hand, and is well suited to the defensive role. In practical use the BKM delivers great accuracy, giving two to three inch groups at 25 yards quite regularly. There are no export/production figures avaliable for the STAR Model BKM Auto Pistol.įormer British Army Serviceman and renowned author Ian V. the BKM was commonly used with European military 9mm ammunition, hence, the combination of light weight frame and high power round, meant the BKM displayed recoil and muzzle blast that was higher than average. meant that the BKM was designed to specifically use this round. The increasing popularity of the 9mm Parabellum Cartridge in the U.S.
However there is only one locking lug on top of the barrel to engage the slide. The breech locking utilises the Browning-Colt swinging link, the traditional method for pistols. Using an aluminium alloy used in aircraft manufacture for the frame, combined with the overall length of 7 inches, the BKM only weighed less then 2lbs even when loaded. Diverting from STAR's previous 9mm automatic pistol line (produced for military purposes) the BKM responded to the growing demand in the US for smaller weapons, which could be concealed for personal defence and, specifically, utilise the 9mm parabellum cartridge.
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