Pismis 24-1
Pismis 24-1 is the brightest region of light at the centre of this optical image of the
NGC 6357 region.
Credit :
ESO/IDA/Danish 1.5 m/ R. Gendler, U.G. Jørgensen, J. Skottfelt, K. Harpsøe
Characteristics
NE
Spectral type
O3.5If*[1]
Variable type
eclipsing [2]
SW
Spectral type
O4III(f+ )[1]
Astrometry Radial velocity (Rv ) −2.0[3] km/s Proper motion (μ) RA: −0.1[4] mas/yr Dec.: −1.3[4] mas/yr Distance 6,500[5] ly (2,000[5] pc ) Absolute magnitude (MV ) −7.50[1]
NE Absolute magnitude (MV ) −6.41[2] SW Absolute magnitude (MV ) −6.28[2]
Details NE Mass 74[6] M ☉ Radius 18 R ☉ Luminosity 776,000[6] L ☉ Temperature 42,500/41,500[2] K SW Mass 66[6] M ☉ Radius 17 R ☉ Luminosity 646,000[6] L ☉ Temperature ~40,000[6] K
Other designations CD−34°11671,
2MASS J17244349-3411570, CCDM J17247-3412A
NE : Pismis 24-1NE, HD 319718ASW : Pismis 24-1SW, HD 319718B
Database references SIMBAD data
Pismis 24-1 (also known as HD 319718 ) is the brightest star in the Pismis 24 open cluster in the NGC 6357 nebula. It is 6,500 light years away. It was thought to be the most massive star known: actually it is made of three stars. These are still some of the most luminous and most massive stars known.
↑ 1.0 1.1 1.2 Maíz Apellániz, J.; Walborn, Nolan R.; Morrell, N. I.; Niemela, V. S.; Nelan, E. P. (2007). "Pismis 24-1: The Stellar Upper Mass Limit Preserved". The Astrophysical Journal . 660 (2): 1480–1485. arXiv :astro-ph/0612012 . Bibcode :2007ApJ...660.1480M . doi :10.1086/513098 . S2CID 15936535 .
↑ 2.0 2.1 2.2 2.3 Barr Domínguez, A.; Chini, R.; Pozo Nuñez, F.; Haas, M.; Hackstein, M.; Drass, H.; Lemke, R.; Murphy, M. (2013). "Eclipsing high-mass binaries. I. Light curves and system parameters for CPD - 51° 8946, PISMIS 24-1, and HD 319702". Astronomy & Astrophysics . 557 : A13. arXiv :1306.5482 . Bibcode :2013A&A...557A..13B . doi :10.1051/0004-6361/201321642 . S2CID 118623790 .
↑ Crampton, D. (1972). "Radial velocities of southern B stars determined at the Radcliffe Observatory - VI. Stars in H II regions" . Monthly Notices of the Royal Astronomical Society . 158 : 85–98. Bibcode :1972MNRAS.158...85C . doi :10.1093/mnras/158.1.85 .
↑ 4.0 4.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics . 355 : L27. Bibcode :2000A&A...355L..27H . doi :10.1888/0333750888/2862 .
↑ 5.0 5.1 Lima, E. F.; Bica, E.; Bonatto, C.; Saito, R. K. (2014). "Probing embedded star clusters in the HII complex NGC 6357 with VVV". Astronomy & Astrophysics . 568 : A16. arXiv :1406.2413 . Bibcode :2014A&A...568A..16L . doi :10.1051/0004-6361/201323050 . S2CID 56229887 .
↑ 6.0 6.1 6.2 6.3 6.4 Fang, M.; Van Boekel, R.; King, R. R.; Henning, T.; Bouwman, J.; Doi, Y.; Okamoto, Y. K.; Roccatagliata, V.; Sicilia-Aguilar, A. (2012). "Star formation and disk properties in Pismis 24". Astronomy & Astrophysics . 539 : A119. arXiv :1201.0833 . Bibcode :2012A&A...539A.119F . doi :10.1051/0004-6361/201015914 . S2CID 73612793 .