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NGC 6604 is a young[6] open cluster of stars in the equatorial constellation of Serpens, positioned about 1.5° north of the Eagle Nebula (NGC 6611).[7] The cluster was discovered by William Herschel on July 15, 1784.[8] It is located at a distance of 4,580[3] light years from the Sun, about 210 ly (65 pc) above the galactic plane.[7] NGC 6604 forms the densest part of the Ser OB2 association of co-moving stars.[9]

NGC 6604
NGC 6604 and its surroundings taken by the Wide Field Imager attached to the 2.2-metre MPG/ESO telescope at the La Silla Observatory in Chile
Observation data (J2000 epoch)
ConstellationSerpens[1]
Right ascension18h 18m 03.0s[2]
Declination−12° 14′ 30″[2]
Distance4,580 ly (1,403 pc)[3]
Apparent magnitude (V)6.5[4]
Physical characteristics
Estimated age6.5 Myr[2]
Other designationsNGC 6604, Cr 373, MM 23, OCl 56, C 1815-122, CTB 50, NRL 17, [KPR2004b] 439, Cl Mrk 39, LMH 24, OCISM 11[5]
See also: Open cluster, List of open clusters

This cluster is fairly compact with a Trumpler class of I3p,[6] and is still undergoing star formation.[10][7] It lies at the heart of an H II region with the identifier S54, and the two are most likely linked.[6] The cluster has an estimated age of 6.5[2] million years and contains several massive stars of the OB type.[6] One of these is the high mass triple star system HD 167971, which includes the over-contact eclipsing binary MY Ser. It is one of the most luminous stars in the galaxy.[10] HD 168112 is another colliding-wind binary in the cluster; both systems are over-luminous in their X-ray emission.[11]


References


  1. "The star cluster NGC 6604 and its surroundings". ESO Press Release. Retrieved 26 April 2012.
  2. Wu, Zhen-Yu; et al. (November 2009). "The orbits of open clusters in the Galaxy". Monthly Notices of the Royal Astronomical Society. 399 (4): 2146–2164. arXiv:0909.3737. Bibcode:2009MNRAS.399.2146W. doi:10.1111/j.1365-2966.2009.15416.x.
  3. Zucker, Catherine; et al. (January 2020). "A compendium of distances to molecular clouds in the Star Formation Handbook". Astronomy & Astrophysics. 633: 16. arXiv:2001.00591. Bibcode:2020A&A...633A..51Z. doi:10.1051/0004-6361/201936145. A51.
  4. Gilmour, Jess K. (2012). The Practical Astronomer’s Deep-sky Companion. Springer London. p. 104. ISBN 9781447100713.
  5. "NGC 6604". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-03.
  6. Barbon, R.; et al. (June 2000). "Spectroscopy and BVI_C photometry of the young open cluster NGC 6604". Astronomy and Astrophysics Supplement. 144: 451–456. arXiv:astro-ph/0004012. Bibcode:2000A&AS..144..451B. doi:10.1051/aas:2000193.
  7. Reipurth, B. (December 2008). Reipurth, Bo (ed.). The Young Cluster NGC 6604 and the Serpens OB2 Association (PDF). Handbook of Star Forming Regions, Volume II. The Southern Sky ASP Monograph Publications. Vol. 5. p. 590. Bibcode:2008hsf2.book..590R. Retrieved 2022-01-05.
  8. Seligman, Courtney. "NGC Objects: NGC 6600 - 6649". Celestial Atlas. Retrieved 2022-01-05.
  9. De Becker, M.; et al. (July 2005). "An XMM-Newton observation of the multiple system HD 167971 (O5-8V + O5-8V + (O8I)) and the young open cluster NGC 6604". Astronomy and Astrophysics. 437 (3): 1029–1046. arXiv:astro-ph/0503471. Bibcode:2005A&A...437.1029D. doi:10.1051/0004-6361:20052810.
  10. Ibanoglu, C.; et al. (November 2013). "MY Serpentis: a high-mass triple system in the Ser OB2 association". Monthly Notices of the Royal Astronomical Society. 436 (1): 750–758. arXiv:1308.4971. Bibcode:2013MNRAS.436..750I. doi:10.1093/mnras/stt1616.
  11. De Becker, M. (July 2015). "Long-term XMM-Newton investigation of two particle-accelerating colliding-wind binaries in NGC 6604: HD 168112 and HD 167971". Monthly Notices of the Royal Astronomical Society. 451 (1): 1070–1080. arXiv:1506.01493. Bibcode:2015MNRAS.451.1070D. doi:10.1093/mnras/stv1034.



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[de] NGC 6604

NGC 6604 ist ein, in das HII-Gebiet Sh2-54 eingebetteter, Offener Sternhaufen vom Trumpler-Typ I3p im Sternbild Schlange auf der Ekliptik. Er hat eine Helligkeit von 6,5 mag und einen Winkeldurchmesser von 6 Bogenminuten. Der Haufen ist rund 5.500 Lichtjahre vom Sonnensystem entfernt. Der noch relativ junge Sternhaufen ist der dichteste Bereich einer „Serpens OB“ genannten Sternassoziation, die insgesamt etwa 100 Sterne der Spektralklassen O und B enthält, unter ihnen der Blaue Überriese HD 167971.[4]
- [en] NGC 6604

[ru] NGC 6604

NGC 6604 (другое обозначение — OCL 56) — рассеянное скопление в созвездии Змея, входит в крупный кластер, насчитывающий сотни голубых звезд[2].


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