BO Carinae

Short description: Star in the constellation Carina

BO Carinae

280px
BO Carinae is the brightest red star, towards upper left, in this image of the Carina Nebula.
Credit: ESO

Observation data
Equinox J2000.0]] (ICRS)
Constellation | Carina
Right ascension |  10h 46m 00.53s
Declination | 59° 29′ 19.5″
Apparent magnitude (V) | 7.18 - 8.50[1]
Characteristics
Spectral type | M4 Ib[1]
Variable type | Lc[1]
Astrometry
Proper motion (μ)|  RA: −7.334±0.027[2] mas/yr
Dec.: −1.420±0.028[2] mas/yr
Parallax (π)| 0.6020 ± 0.0259[2] mas
Distance| 5,400 ± 200 ly
(1,660 ± 70 pc)
Details
Radius| 790[3] R☉
Luminosity| 78,000[3] L☉
Temperature| 3,525[3] K
Other designations

BO Car, IDS 10419−5858, IRAS 10438−5913, 2MASS J10455065−5929193, AAVSO 1042−58, SAO 238447, CD−58 3547, HD 93420

Database references
SIMBAD| data

BO Carinae, also known as HD 93420, is an irregular variable star in the constellation Carina.

BO Car has a maximum apparent magnitude of +7.18. Its distance and membership is uncertain, but its possible membership to the star cluster Trumpler 15 allows a distance estimate of approximately 2,500 parsecs (8,150 light-years).[4][5] The Gaia Data Release 2 parallax of 0.73±0.08 mas suggests a closer distance, but the value is considered unreliable due to excess astrometric noise.[6]

BO Car is a red supergiant of spectral type M4Ib with an effective temperature of 3,525 K, a radius of 790 solar radii. Its bolometric luminosity is 78,000 L☉.[3] Mass-loss is on the order of 0.3×10−9 solar masses per year.[5]

An I band (near infrared) light curve for BO Carinae, plotted from ASAS data[7]

In 1919, William Matthew Worssell of the Union Observatory announced that the star, then known as CPD-58 2683, is a variable star.[8] It was given its variable star designation, BO Carinae, in 1921.[9] Billed as an irregular variable like TZ Cassiopeiae or V528 Carinae; its apparent brightness fluctuates between magnitude +7.18 and +8.50 without clear periodicity.[1][10] Some observers have found BO Car not to be variable,[11] but more extensive studies find small amplitude variations with a possible period of 145 days.[12]

Multiple star catalogues list an 11th-magnitude star as a companion to BO Car. The separation was 14.2″ in 2015, and slowly increasing.[13] The companion is a distant blue giant.[14]

## See also

* RT Carinae
* V528 Carinae
* EV Carinae
* List of largest known stars

## References

1. ↑ 1.0 1.1 1.2 1.3 Samus, N. N. et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S 1. Bibcode: 2009yCat....102025S.
2. ↑ 2.0 2.1 2.2 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
3. ↑ 3.0 3.1 3.2 3.3 Cite error: Invalid `<ref>` tag; no text was provided for refs named `rg`
4. ↑ Tapia, Mauricio; Roth, Miguel; Vázquez, Rubén A.; Feinstein, Alejandro (2003). "Imaging study of NGC 3372, the Carina nebula - I. UBVRIJHK photometry of Tr 14, Tr 15, Tr 16 and Car I". Monthly Notices of the Royal Astronomical Society 339 (1): 44–62. doi:10.1046/j.1365-8711.2003.06186.x. Bibcode: 2003MNRAS.339...44T.
5. ↑ 5.0 5.1 Josselin, E.; Blommaert, J. A. D. L.; Groenewegen, M. A. T.; Omont, A.; Li, F. L. (2000). "Observational investigation of mass loss of M supergiants". Astronomy and Astrophysics 357: 225–232. Bibcode: 2000A&A...357..225J.
6. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
7. ↑ "ASAS All Star Catalogue". The All Sky Automated Survey. http://www.astrouw.edu.pl/asas/?page=aasc.
8. ↑ Worssell, M. W. (1919). "Variable Stars". Circular of the Union Observatory Johannesburg 46: 17. https://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?journal=CiUO.&year=????&volume=..46&letter=.&db_key=AST&page_ind=19&plate_select=NO&data_type=GIF&type=SCREEN_GIF&classic=YES. Retrieved 7 January 2025.
9. ↑ Hartwig; Müller (January 1921). "Benennung von neu entdeckten veränderlichen Sternen". Astronomische Nachrichten 212 (19): 353-374. doi:10.1002/asna.19202121902. https://articles.adsabs.harvard.edu/pdf/1921AN....212..353.. Retrieved 7 January 2025.
10. ↑ Chatys, Filip W.; Bedding, Timothy R.; Murphy, Simon J.; Kiss, László L.; Dobie, Dougal; Grindlay, Jonathan E. (2019). "The period-luminosity relation of red supergiants with Gaia DR2". Monthly Notices of the Royal Astronomical Society 487 (4): 4832. doi:10.1093/mnras/stz1584. Bibcode: 2019MNRAS.487.4832C.
11. ↑ Percy, John R.; Sato, Hiromitsu (2009-02-01). "Long Secondary Periods in Pulsating Red Supergiant Stars". Journal of the Royal Astronomical Society of Canada 103 (1): 11. ISSN 0035-872X. Bibcode: 2009JRASC.103...11P.
12. ↑ Percy, J. R. (2020). "Period Analysis of All-Sky Automated Survey for Supernovae (ASAS-SN) Data on a Sample of "Irregular" Pulsating Red Giants". Journal of the American Association of Variable Star Observers (Jaavso) 48 (1): 50. Bibcode: 2020JAVSO..48...50P.
13. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M.
14. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.

* 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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Original source: https://en.wikipedia.org/wiki/BO Carinae. Read more

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*[Dec.:]: Declination
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