๐Ÿš€ ๅฎ‡ๅฎ™ใฎ่จ˜ๆ†ถใƒปใ‚ซใƒฌใƒณใƒ€ใƒผๆคœ็ดข
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ๆ•ฃ้–‹ๆ˜Ÿๅ›ฃใƒ”ใ‚นใƒŸใ‚น24ใฎๅทจๅคงๆ˜Ÿ Massive Stars in Open Cluster Pismis 24
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้€šๅธธใฎๆ’ๆ˜Ÿใฏใฉใ‚Œใปใฉใฎ่ณช้‡ใ‚’ๆŒใคใ“ใจใŒใงใใ‚‹ใฎใงใ—ใ‚‡ใ†ใ‹? ่ท้›ขใ€ๆ˜Žใ‚‹ใ•ใ€ๆจ™ๆบ–็š„ใชๅคช้™ฝใƒขใƒ‡ใƒซใ‹ใ‚‰ๆŽจๅฎšใ™ใ‚‹ใจใ€ๆ•ฃ้–‹ๆ˜Ÿๅ›ฃใƒ”ใ‚นใƒŸใ‚น24ใฎ1ใคใฎๆ’ๆ˜Ÿใฏๅคช้™ฝใฎ200ๅ€ไปฅไธŠใฎ่ณช้‡ใ‚’ๆŒใกใ€่จ˜้ŒฒไฟๆŒ่€…ใงใ—ใŸใ€‚ใ“ใฎๆ’ๆ˜Ÿใฏใ€ไธŠใฎ็”ปๅƒใฎใ‚ฌใ‚นใƒ•ใƒญใƒณใƒˆใฎใ™ใไธŠใซใ‚ใ‚‹ๆœ€ใ‚‚ๆ˜Žใ‚‹ใ„ๅคฉไฝ“ใงใ™ใ€‚ใ—ใ‹ใ—ใ€ใƒใƒƒใƒ–ใƒซๅฎ‡ๅฎ™ๆœ›้ ้กใงๆœ€่ฟ‘ๆ’ฎๅฝฑใ•ใ‚ŒใŸ็”ปๅƒใ‚’่ฉณใ—ใ่ชฟในใŸใจใ“ใ‚ใ€ใƒ”ใ‚นใƒŸใ‚น24-1ใฎ่ผใ‹ใ—ใ„ๅ…‰ๅบฆใฏๅ˜ไธ€ใฎๆ’ๆ˜Ÿใ‹ใ‚‰ใงใฏใชใใ€ๅฐ‘ใชใใจใ‚‚3ใคใฎๆ’ๆ˜Ÿใ‹ใ‚‰ๅพ—ใ‚‰ใ‚Œใฆใ„ใ‚‹ใ“ใจใŒใ‚ใ‹ใ‚Šใพใ—ใŸใ€‚ๆง‹ๆˆๆ˜Ÿใฏไพ็„ถใจใ—ใฆๅคช้™ฝใฎ100ๅ€่ฟ‘ใ„่ณช้‡ใ‚’ๆŒใกใ€็พๅœจ่จ˜้Œฒใ•ใ‚Œใฆใ„ใ‚‹ๆ’ๆ˜Ÿใฎไธญใงๆœ€ใ‚‚่ณช้‡ใฎๅคงใใ„ๆ’ๆ˜Ÿใฎ1ใคใงใ™ใ€‚็”ปๅƒใฎไธ‹้ƒจใงใฏใ€้–ข้€ฃใ™ใ‚‹่ผ็ทšๆ˜Ÿ้›ฒNGC 6357ใงใพใ ๆ˜ŸใŒๅฝขๆˆใ•ใ‚ŒใฆใŠใ‚Šใ€ใใฎไธญใซใฏใ€ๅฃฎๅคงใช็นญใ‚’็…งใ‚‰ใ—ๅ‡บใ—ใฆใ„ใ‚‹ใ‚ˆใ†ใซ่ฆ‹ใˆใ‚‹ๆ˜Ÿใ‚‚ใ„ใใคใ‹ใ‚ใ‚Šใพใ™ใ€‚
ๅŽŸๆ–‡๏ผˆEnglish๏ผ‰
How massive can a normal star be? Estimates made from distance, brightness and standard solar models had given one star in the open cluster Pismis 24 over 200 times the mass of our Sun, making it a record holder. This star is the brightest object located just above the gas front in the above image. Close inspection of images taken recently with the Hubble Space Telescope, however, have shown that Pismis 24-1 derives its brilliant luminosity not from a single star but from three at least. Component stars would still remain near 100 solar masses, making them among the more massive stars currently on record. Toward the bottom of the image, stars are still forming in the associated emission nebula NGC 6357, including several that appear to be breaking out and illuminating a spectacular cocoon.

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ยฉ NASA / APOD