Astronomy:NGC 6193

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Short description
Open star cluster in the constellation Ara
NGC 6193
Rgb-ngc6193.jpg
NGC 6193 and the nebula NGC 6188
Observation data (J2000 epoch)
ConstellationAra
Right ascension 16h 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
See also: Open cluster, List of open clusters

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.

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] Name Right ascension Declination mV Spectral type Comment
56 HD 150136  16h 41m 20.4149s −48° 45′ 46.644″ 5.62 O3−3.5 V + O5.5−6 V + O6.5−7 V[3] Triple system
55 HD 150135  16h 41m 19.4537s −48° 45′ 47.585″ 6.89 O6.5V((f))z[4] Binary[5]
45 HD 150041  16h 40m 44.5820s −48° 45′ 22.214″ 7.06 B0III Variable[6]
37 HD 149834  16h 39m 30.6704s −48° 51′ 02.511″ 9.17 B2V Binary?[6]
59 CD-48 11080  16h 41m 36.3084s −48° 47′ 14.904″ 10.32 B4V [6]
CD-48 11077  16h 41m 34.91s −48° 46′ 24.2″ 10.42 B2.5V [6]
58 CD-48 11075  16h 41m 33.21s −48° 45′ 06.6″ 10.05[7] B2.5V[5]
54 CD-48 11071  16h 41m 25.8569s −48° 45′ 14.265″ 8.45 B1V Binary[6]
53 CD-48 11069  16h 41m 22.10s −48° 44′ 57″ 9.55 B1V [6]
40 CD-48 11039  16h 40m 00.752s −48° 47′ 02.41″ 11.02[8] B3V[5]
42 CD-48 11046  16h 40m 20.94s −48° 54′ 56.2″ 10.91[8] B2.5V[5]
43 CD-48 11051  16h 40m 33.8837s −48° 53′ 16.19″ 10.39 B1h [6]
CD-48 11060  16h 40m 43s −48° 48.8′ 10.71 B3V [6]
47 CD-48 11061  16h 40m 53.26s −48° 45′ 35.2″ 11.21[8] B3.5V[5] binary[5]
50 CD-48 11062  16h 41m 02.49s −48° 53′ 49.7″ 11.42[7] B3.5V[5]
52 CD-48 11065  16h 41m 08.48s −48° 52′ 21.6″ 11.06[7] B2.5V[5] Wrongly cross-referenced to HD 150136 in Herbst[8]
57 CD-48 11076  16h 41m 33.0589s −48° 33′ 59.651″ 10.10 B2V [6]
63 CD-48 11082  16h 41m 6.3148s −48° 47′ 41.527″ 10.38 B2V [6]
65 CD-48 11086  16h 41m 54.83s −48° 45′ 22.8″ 10.38 B2.5V [6]
66 CD-48 11088  16h 42m 00.47s −48° 42′ 32.5″ 10.05 B2.5V [6]
67 CD-48 11090  16h 42m 05.69s −48° 42′ 56.8″ 10.59 B2.5V [6]

Image gallery

References

  1. Dunlop, Storm (2005). Atlas of the Night Sky. Collins. ISBN 978-0-00-717223-8. https://archive.org/details/collinsatlasofni0000dunl. 
  2. 2.0 2.1 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. doi:10.1093/mnras/125.2.105. Bibcode1963MNRAS.125..105W. 
  3. 3.0 3.1 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. doi:10.1051/0004-6361/201321189. Bibcode2013A&A...553A.131S. 
  4. 4.0 4.1 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. doi:10.1088/0067-0049/211/1/10. Bibcode2014ApJS..211...10S. 
  5. 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 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. doi:10.1086/505782. Bibcode2006ApJ...648..580H. 
  6. 6.00 6.01 6.02 6.03 6.04 6.05 6.06 6.07 6.08 6.09 6.10 6.11 6.12 6.13 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. doi:10.1086/132273. Bibcode1988PASP..100.1076A. 
  7. 7.0 7.1 7.2 7.3 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. Bibcode1992A&AS...92..863V. 
  8. 8.0 8.1 8.2 8.3 8.4 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. Bibcode1977A&AS...30..279H. 
  9. "Star cluster NGC 6193 and nebula NGC 6188". http://www.eso.org/public/images/eso1510a/. 
  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. Bibcode1973A&AS...10..135M. 

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