NGC 3603-C

Short description: Binary star system in the constellation Carina

NGC 3603-C

C is the brightest star to the left of the very close A (three not quite resolved stars at the very centre of the image) and B pair at the centre in this HST image of the central region of HD 97950.
Credit: NASA, ESA and Wolfgang Brandner (MPIA), Boyke Rochau (MPIA) and Andrea Stolte (University of Cologne)

Observation data
Epoch J2000.0 Equinox (celestial coordinates)
Constellation | Carina
Right ascension |  11h 15m 07.589s[1]
Declination | −61° 15′ 38.00″[1]
Apparent magnitude (V) | 11.89[1]
Characteristics
Spectral type | WN6h+?[2]
B−V color index | 1.05[1]
Astrometry
Proper motion (μ)|  RA: 2.4[3] mas/yr
Dec.: 2.8[3] mas/yr
Distance| 7,600[2] pc
Absolute magnitude (MV)| −7.17[2]
Orbit[4]
Primary| C
Period (P)| 8.89 ± 0.01 days
Eccentricity (e)| 0.30 ± 0.04
Inclination (i)| 71°
Periastron epoch (T)| 2453546.61 ± 0.18
Argument of periastron (ω)
(secondary)| 281 ± 7°
Semi-amplitude (K1)
(primary)| 200 ± 23 km/s
Details
Mass| 113[2] M☉
Radius| 26.2[2] R☉
Luminosity| 2,200,000[2] L☉
Temperature| 44,000[2] K
Age| 1.5[2] Myr
Other designations

NGC 3603-C, CD-60°3452C, CPD-60°2732C, HD 97950C, HIP 54948C, WR 43c, AAVSO 1110-60, NGC 3603 MDS 18

Database references
SIMBAD| data

NGC 3603-C (HD 97950C) is a single-lined spectroscopic binary star system located at the centre of the HD 97950 cluster in the NGC 3603 star-forming region, about 25,000 light years from Earth. The primary has spectral type WN6h and is among the most luminous and most massive known.

HD 97950 was catalogued as a star, but was known to be a dense cluster or close multiple star. In 1926, the six brightest members were given letters from A to F,[5] although several of them have since been resolved into more than one star.[6] Star C was shown to be a binary, but its companion has not been observed.[4]

HD 97950C is a Wolf-Rayet (WR) star, with spectra dominated by strong broadened emission lines. Type WN6 indicates that ionised nitrogen lines are strong in comparison to ionised carbon lines, and the suffix h indicates that hydrogen is also seen in the spectrum. This type of WR star is not the classical stripped helium-burning aged star, but a young highly luminous object with CNO cycle fusion products showing at the surface due to strong conventional and rotational mixing, and high mass loss rates from the atmosphere. The emission lines are generated in the stellar wind and the photosphere is completely hidden. The surface fraction of hydrogen is still estimated to be 70%.[2]

The two component stars of NGC 3603-C circle each other every nine days. It is assumed that the secondary is sufficiently smaller and fainter than the primary not to affect the calculation of its physical properties. The mass is estimated to be 113 M☉ and the luminosity over two million L☉. Although the star is very young, around 1.5 million years old, it has already lost a considerable fraction of its initial mass. The initial mass is estimated to have been 137 M☉, meaning it has lost 24 M☉.[2]

## See also

* NGC 3603-A1
* NGC 3603-B

## References

1. ↑ 1.0 1.1 1.2 1.3 Melena, Nicholas W.; Massey, Philip; Morrell, Nidia I.; Zangari, Amanda M. (2008). "The Massive Star Content of NGC 3603". The Astronomical Journal 135 (3): 878–891. doi:10.1088/0004-6256/135/3/878. ISSN 0004-6256. Bibcode: 2008AJ....135..878M.
2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Crowther, P. A.; Schnurr, O.; Hirschi, R.; Yusof, N.; Parker, R. J.; Goodwin, S. P.; Kassim, H. A. (2010). "The R136 star cluster hosts several stars whose individual masses greatly exceed the accepted 150 M⊙ stellar mass limit". Monthly Notices of the Royal Astronomical Society 408 (2): 731–751. doi:10.1111/j.1365-2966.2010.17167.x. Bibcode: 2010MNRAS.408..731C.
3. ↑ 3.0 3.1 Zacharias, N. et al. (2003). "The Second U.S. Naval Observatory CCD Astrograph Catalog (UCAC2)". CDS/ADC Collection of Electronic Catalogues 1289. Bibcode: 2003yCat.1289....0Z.
4. ↑ 4.0 4.1 Schnurr, O.; Casoli, J.; Chené, A. -N.; Moffat, A. F. J.; St-Louis, N. (2008). "The very massive binary NGC 3603-A1". Monthly Notices of the Royal Astronomical Society: Letters 389 (1): L38–L42. doi:10.1111/j.1745-3933.2008.00517.x. Bibcode: 2008MNRAS.389L..38S.
5. ↑ Van Den Bos, W. H. (1928). "Another nebulous multiple star". Bulletin of the Astronomical Institutes of the Netherlands 4: 261. Bibcode: 1928BAN.....4..261V.
6. ↑ Moffat, Anthony F. J.; Drissen, Laurent; Shara, Michael M. (1994). "NGC 3603 and its Wolf-Rayet stars: Galactic clone of R136 at the core of 30 Doradus, but without the massive surrounding cluster halo". Astrophysical Journal 436: 183. doi:10.1086/174891. Bibcode: 1994ApJ...436..183M.

## External links

* NASA Astronomy Picture of the Day: Starburst Cluster in NGC 3603 (5 October 2007)
* NASA Image of the day

* v
* t
* e

Carina constellation

Stars
(list)|

| Bayer|

* α (Canopus)
* β (Miaplacidus)
* ε (Avior)
* η
* θ
* ι (Aspidiske)
* υ
* χ
* ω

|

Variable|

* R
* S
* T (not variable)
* U
* V
* X
* Y
* RT
* UX
* VY
* WZ
* XY
* XZ
* YZ
* AG
* BO
* CK
* CR
* DW
* EM
* EY
* GG
* GH
* GL
* GZ
* HH
* HR
* IW
* IX
* OY
* PP (p)
* QU
* QX
* QY
* QZ
* V337 (q)
* V341
* V343 (d)
* V344 (f)
* V345 (E)
* V348
* V357 (a)
* V364
* V368
* V369
* V370
* V371 (z2)
* V372
* V374
* V375
* V376 (b1)
* V381
* V382 (x)
* V386
* V390
* V392
* V398
* V399 (P)
* V403
* V409
* V414
* V415 (A)
* V428
* V430
* V431
* V448 (O)
* V450
* V460
* V461
* V469
* V473
* V478
* V482
* V486
* V487
* V492
* V495
* V507
* V514
* V518
* V519
* V520 (w)
* V522
* V524
* V528
* V532
* V533 (y)
* V535
* V557
* V560
* V596
* V640
* V655

HR|

* 2278
* 2400
* 2416
* 2435 (N)
* 2515
* 2523
* 2524
* 2592
* 2634
* 2638
* 2652
* 2661
* 2698
* 2754
* 2767
* 2813
* 2815
* 2862
* 2884
* 2892
* 2925
* 2934 (Q)
* 2941
* 3006
* 3012
* 3031
* 3056
* 3062
* 3070
* 3100
* 3105
* 3120
* 3133
* 3138
* 3139
* 3152
* 3156
* 3159 (D)
* 3161
* 3180
* 3217
* 3218
* 3220 (B)
* 3260 (C)
* 3274
* 3293
* 3298
* 3368
* 3414 (e2)
* 3415 (e1)
* 3432
* 3443
* 3455
* 3471
* 3489
* 3536
* 3549
* 3560
* 3571 (c)
* 3598 (b2)
* 3604
* 3622
* 3632
* 3643 (G)
* 3663 (i)
* 3673
* 3691
* 3693
* 3696 (g)
* 3712
* 3720
* 3721
* 3728 (k)
* 3740
* 3742
* 3752
* 3761
* 3776
* 3777
* 3783
* 3813
* 3821 (H)
* 3825 (h)
* 3856 (m)
* 3863
* 3864
* 3884 (l)
* 3887
* 3913
* 3914
* 3944
* 3957
* 3960
* 3966
* 3967
* 3971
* 3995
* 4002
* 4018
* 4022
* 4025 (M)
* 4043
* 4065
* 4089 (L)
* 4091
* 4095
* 4102 (I)
* 4105
* 4114 (s)
* 4115
* 4120
* 4128
* 4138 (K)
* 4142
* 4144
* 4151
* 4159 (r)
* 4164 (t1)
* 4177 (t2)
* 4179
* 4186
* 4204
* 4205
* 4211
* 4212
* V213
* 4217
* 4219
* 4220
* 4222
* 4226
* 4239
* 4257 (u)
* 4262
* 4266
* 4279
* 4290
* 4323
* 4325 (z1)
* 4326
* 4329
* 4349
* 4355
* 4361
* 4384

HD|

* 49219
* 51608
* 53143
* 54967
* 63765
* 65216
* 79699
* 81896
* 82458
* 84046
* 89805
* 90074
* 90657
* 91094
* 92399
* 92536
* 93129A
* 93250
* 93403
* 93645
* 93695
* 93738
* 93739
* 93843
* 94275
* 94305
* 94491
* 95122
* 96088
* 97950
* 98025

Other|

* BPM 6502
* CPD−57° 2874
* CPD−59° 2628
* CPD−59° 2635
* DEN 0817−6155
* 1E 1048-59
* FO 15
* He 2-38
* Innes' star
* LHS 288
* NGC 3603-A1
* NGC 3603-B
* NGC 3603-C
* OGLE-TR-111
* OGLE-TR-113
* OGLE-TR-122
* OGLE-TR-123
* OGLE-TR-132
* OGLE-TR-182
* OGLE-TR-211
* OGLE2-TR-L9
* PSR J1048-5832
* PSR J1119-6127
* 2S 0921-630
* Sher 25
* SS73 17
* Tr 16-104
* WR 16
* WR 18
* WR 20a
* WR 21a
* WR 22
* WR 23
* WR 24
* WR 25
* WR 30
* WR 30a
* WR 31a
* WR 40
* WR 42e
* AWI0005x3s
* WRA 751

Star
clusters|

| Association|

* Carina OB1
* Carina OB2

|

Open|

* Collinder 228
* IC 2602
* NGC 2516
* NGC 2609
* NGC 3036
* NGC 3114
* NGC 3247
* NGC 3255
* NGC 3293
* NGC 3324
* NGC 3496
* NGC 3519
* NGC 3532
* NGC 3572
* NGC 3590
* NGC 3603
* Trumpler 14
* Trumpler 15
* Trumpler 16
* Westerlund 2

Globular|

* NGC 2808

Nebulae|

| H II|

* Carina Nebula
* NGC 3199
* NGC 3576
* NGC 3579
* NGC 3581
* NGC 3582
* NGC 3584
* NGC 3586
* RCW 49

|

Reflection|

* Homunculus Nebula
* IC 2220
* NGC 3503

Planetary|

* He 2-36
* Hen 2-47
* IC 2448
* IC 2501
* IC 2553
* NGC 2867
* NGC 3211

SNR|

* G290.1-0.8

Pulsar wind|

* IGR J11014−6103

Galaxies|

| NGC|

* 2191
* 2369
* 2369A
* 2369B
* 2381
* 2417
* 2502
* 2640
* 2714
* 2788
* 2822
* 2836
* 2842
* 2887
* 3059
* 3136
* 3136A
* 3136B

|

Other|

* Carina Dwarf Spheroidal Galaxy

Galaxy
clusters|

* Abell 3391
* Abell 3395
* Bullet Cluster

Other|

* GRB 000131
* GRB 080916C

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