NGC 6193

NGC 6193 (also known as Caldwell 82) is open cluster containing 27 stars in the constellation Ara, visible to the unaided eye.[1] NGC 6193 lies at the center of the Ara OB1 association, which extends over a square degree. The cluster is associated with (and provides the energizing radiation for) neighboring regions of the nebulosity NGC 6188.

NGC 6193
NGC 6193 and the nebula NGC 6188
Observation data (J2000 epoch)
Right ascension16h 41m 20s
Declination−48° 45′ 48″
Distance3765.3 ly (1155 pc)
Apparent magnitude (V)5.2
Apparent dimensions (V)15′
Physical characteristics
Estimated age3 million years
Other designationsC 1637-486, Cl VDBH 195, OCl 975, Dun 413, Cr 310, ESO 226-SC020, Lund 716, h 3642, GC 4225, Caldwell 82
Associations
ConstellationAra

Cluster members

NGC 6193 is dominated by two O class multiple star systems within 10" of each other at the centre of the cluster, and a probable binary B0 giant. There are at least 20 other early B stars in the cluster, of 9th and 10th magnitude.

#[2]NameRight ascensionDeclinationmVSpectral typeComment
56HD 15013616h 41m 20.4149s−48° 45′ 46.644″5.62O3−3.5 V + O5.5−6 V + O6.5−7 V[3]Triple system
55HD 15013516h 41m 19.4537s−48° 45′ 47.585″6.89O6.5V((f))z[4]Binary[5]
45HD 15004116h 40m 44.5820s−48° 45′ 22.214″7.06B0IIIVariable[6]
37HD 14983416h 39m 30.6704s−48° 51′ 02.511″9.17B2VBinary?[6]
59CD-48 1108016h 41m 36.3084s−48° 47′ 14.904″10.32B4V[6]
CD-48 1107716h 41m 34.91s−48° 46′ 24.2″10.42B2.5V[6]
58CD-48 1107516h 41m 33.21s−48° 45′ 06.6″10.05[7]B2.5V[5]
54CD-48 1107116h 41m 25.8569s−48° 45′ 14.265″8.45B1VBinary[6]
53CD-48 1106916h 41m 22.10s−48° 44′ 57″9.55B1V[6]
40CD-48 1103916h 40m 00.752s−48° 47′ 02.41″11.02[8]B3V[5]
42CD-48 1104616h 40m 20.94s−48° 54′ 56.2″10.91[8]B2.5V[5]
43CD-48 1105116h 40m 33.8837s−48° 53′ 16.19″10.39B1h[6]
CD-48 1106016h 40m 43s−48° 48.8′10.71B3V[6]
47CD-48 1106116h 40m 53.26s−48° 45′ 35.2″11.21[8]B3.5V[5]binary[5]
50CD-48 1106216h 41m 02.49s−48° 53′ 49.7″11.42[7]B3.5V[5]
52CD-48 1106516h 41m 08.48s−48° 52′ 21.6″11.06[7]B2.5V[5]Wrongly cross-referenced to HD 150136 in Herbst[8]
57CD-48 1107616h 41m 33.0589s−48° 33′ 59.651″10.10B2V[6]
63CD-48 1108216h 41m 6.3148s−48° 47′ 41.527″10.38B2V[6]
65CD-48 1108616h 41m 54.83s−48° 45′ 22.8″10.38B2.5V[6]
66CD-48 1108816h 42m 00.47s−48° 42′ 32.5″10.05B2.5V[6]
67CD-48 1109016h 42m 05.69s−48° 42′ 56.8″10.59B2.5V[6]
  • Star cluster NGC 6193 and nebula NGC 6188.
    Star cluster NGC 6193 and nebula NGC 6188.[9]
  • Map showing the location of NGC 6193.
    Map showing the location of NGC 6193.

References
  1. Dunlop, Storm (2005). Atlas of the Night Sky. Collins. ISBN 978-0-00-717223-8.
  2. Whiteoak, J. B.; Rodgers, A. W. (1963). "An association of O and B stars in Ara". Monthly Notices of the Royal Astronomical Society. 125 (2): 105. Bibcode:1963MNRAS.125..105W. doi:10.1093/mnras/125.2.105.
  3. Sana, H.; Le Bouquin, J.-B.; Mahy, L.; Absil, O.; De Becker, M.; Gosset, E. (2013). "Three-dimensional orbits of the triple-O stellar system HD 150136". Astronomy & Astrophysics. 553: A131. arXiv:1304.3457. Bibcode:2013A&A...553A.131S. doi:10.1051/0004-6361/201321189. S2CID 41993530.
  4. Sota, A.; Maíz Apellániz, J.; Morrell, N. I.; Barbá, R. H.; Walborn, N. R.; Gamen, R. C.; Arias, J. I.; Alfaro, E. J. (2014). "The Galactic O-Star Spectroscopic Survey (GOSSS). II. Bright Southern Stars". The Astrophysical Journal Supplement. 211 (1): 10. arXiv:1312.6222. Bibcode:2014ApJS..211...10S. doi:10.1088/0067-0049/211/1/10. S2CID 118847528.
  5. Huang, W.; Gies, D. R. (2006). "Stellar Rotation in Young Clusters. I. Evolution of Projected Rotational Velocity Distributions". The Astrophysical Journal. 648 (1): 580–590. arXiv:astro-ph/0510450. Bibcode:2006ApJ...648..580H. doi:10.1086/505782. S2CID 13989261.
  6. Arnal, Marcelo; Morrell, Nidia; Garcia, Beatriz; Levato, Hugo (1988). "The open cluster NGC 6193 - Another cluster rich in spectroscopic binaries". Astronomical Society of the Pacific. 100: 1076. Bibcode:1988PASP..100.1076A. doi:10.1086/132273.
  7. Vazquez, R. A.; Feinstein, A. (1992). "Binary stars - Another effect contributing to the supposed abnormal extinction law in NGC 6193?". Astronomy and Astrophysics Supplement Series. 92: 863. Bibcode:1992A&AS...92..863V.
  8. Herbst, W.; Havlen, R. J. (1977). "ARA OB1, NGC 6193 and ARA R1 - an optical study of a very young southern complex". Astronomy and Astrophysics Supplement Series. 30: 279. Bibcode:1977A&AS...30..279H.
  9. "Star cluster NGC 6193 and nebula NGC 6188". Retrieved 18 June 2015.
  10. Moffat, A. F. J.; Vogt, N. (1973). "Southern open stars clusters. III. UBV-Hbeta photometry of 28 clusters between galactic longitudes 297d and 353d". Astronomy and Astrophysics Supplement Series. 10: 135. Bibcode:1973A&AS...10..135M.
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