NGC 6604

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)
Right ascension18h 18m 03.0s[1]
Declination−12° 14′ 30″[1]
Distance4,580 ly (1,403 pc)[2]
Apparent magnitude (V)6.5[3]
Physical characteristics
Estimated age6.5 Myr[1]
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[4]
Associations
ConstellationSerpens[5]
See also: Open cluster, List of open clusters

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[2] 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]

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[1] 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. ^ a b c d 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. S2CID 6066790.
  2. ^ a b 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. S2CID 209832293. A51.
  3. ^ Gilmour, Jess K. (2012). The Practical Astronomer's Deep-sky Companion. Springer London. p. 104. ISBN 9781447100713.
  4. ^ "NGC 6604". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-03.
  5. ^ "The star cluster NGC 6604 and its surroundings". ESO Press Release. Retrieved 26 April 2012.
  6. ^ a b c d Barbon, R.; et al. (June 2000). "Spectroscopy and BVI_C photometry of the young open cluster NGC 6604". Astronomy and Astrophysics Supplement. 144 (3): 451–456. arXiv:astro-ph/0004012. Bibcode:2000A&AS..144..451B. doi:10.1051/aas:2000193. S2CID 6514418.
  7. ^ a b c Reipurth, B. (December 2008). Reipurth, Bo (ed.). The Young Cluster NGC 6604 and the Serpens OB2 Association (PDF). The Southern Sky ASP Monograph Publications. Vol. 5. p. 590. Bibcode:2008hsf2.book..590R. Retrieved 2022-01-05. {{cite book}}: |work= ignored (help)
  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. S2CID 16980385.
  10. ^ a b 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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