List of O-type stars
This is a list of O-type stars by their distance from Earth.[1][2][3]
List
Milky Way galaxy
| Star system←← | Star Image | Median distance (ly) | Stars in system | Spectral type | Apparent magnitude (V) | Comments and references |
|---|---|---|---|---|---|---|
| Zeta Ophiuchi | 440 ± 40 | 1 | O9.5 V | 2.56 – 2.58 | The closest O-type star to Earth. | |
| Phi Persei B | 720 ± 30 | 1 | sdO | 4.06 | Has a B-type companion star. | |
| 28 Cygni B | 840 ± 20 | 2 | sdO | 4.93 | Has a B-type companion star. | |
| Iota Arae B | 920 ± 20 | 2 | sdO | 5.18–5.26 | Has a B-type companion star. | |
| Rho¹ Arae B | 990 ± 10 | 2 | sdO | 6.275 | Has a B-type companion star. | |
| Kappa¹ Apodis B | 1,060 ± 20 | 1 | sdO | 5.52 | Has a B-type companion star. | |
| Zeta Puppis (Naos) | 1,080 ± 40 | 1 | O4If(n)p | 2.24 - 2.26 | ||
| Gamma² Velorum B (Suhail al Muhlif/Regor) | 1096+26 −23 |
2 | O7.5III | 1.83 | Has a Wolf-Rayet companion star. | |
| Theta² Orionis A | 1,100 ± 80 | 3 | O9.5IVp | 5.02 | ||
| Mintaka Aa1 (Delta Orionis) | 1,200 | 3 | O9.5II | 2.5 | ||
| V2119 Cygni | 1203±22.3 | 1 | sdO | |||
| 60 Cygni | 1225±57 | 1 | sdO | |||
| Upsilon Orionis | 1,260±75 | 1 | B0V or O9.7V | +4.618±0.013 | ||
| Alnitak Aa (Zeta Orionis) | 1,260 ± 180 | 3 | O9.5Iab | 1.77 | ||
| Sigma Orionis Aa | 1263±4.3 | 2 | O9.5V | 4.07 | ||
| Meissa A (Lambda Orionis) | 1260±200 | 1 | O8 III((f)) | 3.7 | ||
| AE Aurigae | 1,320 ± 40 | 1 | O9.5V | 5.96 | ||
| Xi Persei (Menkib) | 1,340±65 | 1 | O7.5III(n)((f)) | 4.04 | ||
| Theta¹ Orionis C1 | 1340±65 | 1 | O6Vp | 5.13 | ||
| Iota Orionis Aa1 (Haytsa) | 1343+45.6 −42.3 |
3 | O9 III | 2.77 | ||
| LS Muscae | 1383±43 | 1 | sdO | |||
| W40 IRS 1A South | 1,420 | 1 | O9.5 | 15 | Member of Westerhout 40. | |
| IN Comae Berenices B (HD 112313) | 1,650 ± 40 | 2 | sdO | 8.69 | Central star of LoTr 5 Planetary Nebula. Has a G-type companion star. | |
| HD 49798 | 1,700 ± 46 | 1 | sdO6p | |||
| 10 Lacertae | 1,800±103 | 1 | O9V | 4.880 | ||
| FY Canis Majoris B | 1,820 ± 70 | 2 | sdO | 4.8 - 6.25 | Has a B-type companion star. | |
| Mu Columbae | 1,894±111 | 1 | O9.5 V | 5.18 | ||
| HD 186924 | 2000 | 1 | O6fp | It is the central star of NGC 6826 Planetary Nebula. | ||
| HD 206267 | 2,000 | 2 | O6V((f)) + O9V | 5.70 | ||
| UY Sextantis | 2,200 ± 100 | 1 | sdO9VII:He6 | 13.49 | ||
| 68 Cygni | 2,200 ± 200 | 1 | O7.5IIIn((f)) | 5.00 | ||
| Delta Circini | 2,300 ± 200 | 1 | O8IV + O9.5V | 5.09 | ||
| S Monocerotis (15 Monocerotis) | 2,300 ± 200 | 3 | O7V((f))zvar + O9.5Vn | |||
| HD 73882 | 2,400 ± 100 | 1 | O8.5IV | 7.19 - 7.29 | ||
| 1 Camelopardalis A | 2,580 ± 100 | 1 | O9.7IIn | 5.77 | ||
| X Persei | 2,600 ± 100 | 1 | O9.5IIIe-B0Ve | 6.778 | ||
| NSVS 14256825 A | 2,700 ± 100 | 2 | sdOB | 13.2 | Has a M-type companion star. | |
| Lambda Cephei | 3,098.5 | 1 | O6.5If(n)p | +5.050 | ||
| HD 193322 | 3,100 | 2 | O9Vnn + O8.5 III | +5.958 | ||
| Mu Normae | 3,260 | 1 | O9.7Iab | 4.91 | ||
| HD 35914 | 3,600 ± 1.0 | 1 | O7fp | It is the central star of IC 418 Planetary Nebula. | ||
| 63 Ophiuchi | 3,600 ± 300 | 1 | O8II((f)) | 6.20 | ||
| UW Canis Majoris | 3,800 | 2 | O7.5-8Iabf + O9.7Ib | 4.95 | ||
| Trumpler 27-27 | 3,900 | 1 | O8III((f)) | |||
| V3903 Sagittarii A (11 Sagittarii) | 3,900 ± 100 | 1 | O7V(n)z | 7.00–7.45 | Has a B-type companion. | |
| HD 148937 | 3,900 ± 100 | 1 | O6f?p | 6.73 | ||
| 19 Cephei | 3,913.88 | 1 | O9Ib | 5.08 | ||
| HD 54879 | 4100 ± 200 | 1 | O9.7V | 7.65 | ||
| HD 164492 A | 4100 ± 200 | 1 | O7.5III | Part of Trifid Nebula | ||
| 9 Sagittarii | 4,100 ± 400 | 1 | O4V((f))z (O3.5V((f+)) + O5–5.5V((f))) | 5.97 | ||
| 15 Sagittarii | 4,200±650 | 1 | O9.7 Iab or B0 Iab | 5.37 | ||
| AO Cassiopeiae (Pearce's Star) | 4,300 ± 300 | 2 | O8V((f)) + O9.2II | 6.07-6.24 | ||
| HD 149404 (V918 Scorpii) | 4,300 ± 400 | 2 | O7.5I(f) + ON9.7I | 5.42 - 5.50 | ||
| HD 150136 | 4,310 ± 390 | 3 | O3 V((f*)) - O3.5 V((f+)) + O5.5-6 V((f)) + O6.5-7 V((f)) | 5.54 | ||
| 16 Sagittarii | 4,600 | 1 | O9.5 III | 6.02 | ||
| BE Ursae Majoris A | 4,600 ± 200 | 2 | DO | 14.8 to 17.8 | Has a M-type companion star. | |
| Y Cygni | 4,900 | 2 | O9.5V + O9.5V | 7.3 - 7.9 | ||
| WR 140 B (SBC9 1232) | 4950 ± 21 | 2 | O5.5fc | 6.85 | Has a Wolf-Rayet Companion. | |
| HD 92206 | 5,000 | 3 | O8V + O9.7V | 8.966 | Has a B-type companion. | |
| HD 229196 | 5,000 | 1 | O5 | |||
| HD 93521 B | 5,000 ± 300 | 1 | O9.5IIInn or O9.5Vp | 7.03 | ||
| Tau Canis Majoris Aa | 5,120.66 | 3 | O9II | 4.40 | ||
| HD 46223 | 5,200 | 1 | O4V | |||
| HD 46150 | 5,200 | 1 | O5V | |||
| 4U 1700-37 (V884 Scorpii) | 5,200 ± 200 | 1 | O6Iafcp | 6.51 | ||
| Plaskett's Star (V640 Monocerotis) | 5,245 | 2 | O8I + O7.5III | 6.06 | ||
| Cygnus OB2-8A | 5,400 ± 200 | 1 | O6If + O5.5III(f) | 9.06 | ||
| BD+43 3654 | 5,400 ± 300 | 1 | O4If | 10.06 | ||
| HD 15558 (HIP 11832) | 5,700 | 1 | O4.5III(f) (O5.5III(f) + O7V) | 7.87 | ||
| HD 168076 | 5,700±400 | 2 | O3.5V + O7.5V | +8.24 | ||
| NGC 7662 Central star | 5,730 ± 340 | 1 | sdO | Central star of NGC 7662 Planetary Nebula. | ||
| Prisms 24-17 | 5,900 | 1 | O3.5III | |||
| HD 48099 | 5,965 | 2 | O5.5V((f)) + O9V | 6.37 | ||
| HD 165319 | 6,000 | 1 | O9.7Ib | Central star of Sh2-46 Nebula. | ||
| Alpha Camelopardalis | 6,000 | 1 | O9Ia | 4.29 | ||
| WR 133 B (V1676 Cyg) | 6,100 ± 300 | 2 | O9I | 6.75 - 6.84 | Has a Wolf-Rayet Companion. | |
| HD 191612 A | 6,100 ± 300 | 1 | O8fp | 7.84 – 7.91 | ||
| HD 108 | 6,230 ± 360 | 1 | O4–8f?p | 7.40 | ||
| HD 59088 | 6,500 | 1 | O(H)6f | It is the central star of NGC 2392 Planetary Nebula. | ||
| WR 25 (HD 93162) | 6,500 | 2 | O2.5If*/WN6 + OB | 8.80 | ||
| Pismis 24-1 (HD 319718) | 6,500 | 2 | O3.5If*+O4III(f+) | |||
| WR 137 B | 6,700 ± 200 | 1 | O9V | 7.91 | Has a Wolf-Rayet Companion. | |
| CV Serpentis B | 6,700 ± 200 | 2 | O8-9IV | 9.08 | Has a Wolf-Rayet Companion. | |
| LY Aurigae | 6,800 | 3 | O9II + O9III | 6.85 (6.66 - 7.35) | Has B-type companion. | |
| HD 151804 (V973 Scorpii) | 7,000 | 1 | O8 Iaf | 5.22 - 5.28 | ||
| HD 138403 | 7175.44 | 1 | O8(f)ep | It is the central star of Hen 2-131 Planetary Nebula. | ||
| Cygnus X-1 (HDE 226868) | 7,300 ± 200 | 2 | O9.7Iab | 8.95 | Has a Black Hole Companion. | |
| Theta Muscae | 7,400 | 4 | O6/7V + O9.5/B0Iab+O9III | 5.53 | Has a Wolf-Rayet Companion. | |
| HD 92206 B | 7,400 ± 300 | 1 | O6.5V or O6V((f))z | |||
| PSR B1259−63/LS 2883 A | 7,500 | 2 | O9.5Ve | 10.34 | Has a Pulsar Companion. | |
| Eta Carinae A (Eta Argus) | 7,500 | 2 | O | −1.0 to ~7.6 | part of Trumpler 16 in the Carina Nebula. | |
| HD 93129 | 7,500 | 2 | O2If* (O2If+O3.5V) + O3.5 V((f))z | 6.90 | Part of Trumpler 14. | |
| QZ Carinae (HD 93206) | 7,501.6 | 4 | O9.7I+O8III+O9V | 6.24 | ||
| HD 93205 (V560 Carinae) | 7,600 ± 400 | 2 | O3.5Vf + O8V | 7.75 | ||
| HD 97319 | 7,800-9,800 | 1 | O | Part of NGC 3576. | ||
| HD 93250 | 7,900 ± 400 | 1 | O4 IV(fc) | 7.41 | ||
| 6 Cassiopeiae B | 8,000 | 2 | O9.75 | 5.34 - 5.45 | Has a A-type Hypergiant Companion. | |
| HD 93160 | 8,000 | 1 | O6III | |||
| LS 5039 A | 8200±300 | 1 | O(f)N6.5V | 11.27 | Has a Black Hole Companion. | |
| WR 22 B | 8,300 ± 700 | 2 | O9III-V | 6.42 | Has a Wolf-Rayet Companion. | |
| HD 92206 | 8,400 ± 500 | 2 | O6.5V + O6.5V, O6V((f))z (combined) | +8.219 | ||
| Abell 63 Central star | 8,810 | 1 | sdO | Center Star of Abell 63 Planetary Nebula. | ||
| HD 303308 | 9,200 | 1 | O3V | |||
| LSS 4067 (CD−38°11748) | 9,500–12,700 | 1 | O4.5Ifpe | 11.44 | ||
| DH Cephei | 9,600 ± 400 | 2 | O5.5 V + O6 V | 8.61 | ||
| BD+60°2522 | 9,800 ± 400 | 1 | O6.5(f)(n)p | 8.67 | ||
| HD 93130 | 10,000 | 1 | O7II(f) | |||
| HD 93403 | 10,000 | 1 | O5.5III(fc)var | 7.272 | ||
| HD 93632 | 10,000 | 1 | O5III(f) | |||
| LSS 4067 | 11,000 | 1 | O4.5Ifpe | Part of HM 1. | ||
| HM 1-6 | 11,000 | 1 | O5If | Part of HM 1. | ||
| HM 1-8 | 11,000 | 2 | O4.5IV(f) + O9.7V | Part of HM 1. | ||
| HD 35619 | 12,000 | 1 | O7.5V((f))z | 8.572 | ||
| WR 9 B | 12,000 ± 600 | 2 | O7 | 10.50 | Has a Wolf-Rayet Companion star. | |
| MY Camelopardalis | 13,050 | 1 | O6nn (O6V((f)) + O6V((f))) | 9.80 - 10.15 | ||
| WR 21a | 13,100 ± 700 | 1 | O3/WN5ha + O3Vz((f*)) | 12.661 | Has a Wolf-Rayet Companion. | |
| CD Crucis B (WR 47) | 14,000 | 2 | O5V | 10.81 | Has a Wolf-Rayet Companion. | |
| WR 20a | 14,000 ± 1,000 | 2 | O3If*/WN6 + O3If*/WN6 | 13.28 | ||
| HD 64568 | 15,000 ± 1,000 | 1 | O3V((f*))z | 9.39 | ||
| TU Muscae | 15500 | 2 | O7V + O8V | 8.307 | ||
| NGC 1624-2 | 16,800 | 1 | O7f?cp | 11.57 | ||
| GCIRS 16SW | 20,000 | 1 | Ofpe/WN9 | |||
| GCIRS 8* | 20,000 | 1 | O5 | |||
| V1936 Aquilae | 20,000 | 1 | O4I | 15.1 | ||
| Westerhout 51d | 20,000 | 1 | O | Member of Westerhout 51. | ||
| Westerhout 51-3 | 20,000 | 1 | O3-8V | Member of Westerhout 51. | ||
| Westerhout 51-57 | 20,000 | 1 | O4V | Member of Westerhout 51. | ||
| MSP 183 | 20,000 | 1 | O3V(f) | Part of Westerlund 2. | ||
| HD 116852 (HIP 65890) | 20,580 | 1 | O8.5 II-III ((f)) | 8.47 | ||
| WR 30a B | 21,920+1,400 −1,090 |
2 | O5((f)) | 12.73 | Has a Wolf-Rayet Companion. | |
| Centaurus X-3 (Krzemiński's star) | 24,000 ± 2,000 | 2 | O6-7 II-III + ? | 13.25 (- 13.39) - 13.46 | ||
| HD 15558 A | 24,400 | 1 | O5.5III(f) | Part of IC 1805. | ||
| MTT 68 | 24,787.88 | 1 | O2If* | 14.72 | ||
| HD 97950 A3 | 24,800 | 1 | O3III | |||
| WR 42e (2MASS J11144550-115001) | 25,000 | 1 | O3If*/WN6 | 14.53 | ||
| HD 97950 | 25,000 | 1 | O | |||
| Arches-F15 | 25,000 | 1 | O6-7 Ia+ | |||
| Arches-F18 | 25,000 | 1 | O4-5 Ia+ | |||
| WR 102ka (Peony star) | 26,000 | 2 | Ofpe/WN9 | |||
| WR 148 B | 27,000 | 2 | O5V? | 10.3 | Has a Wolf-Rayet Companion. | |
| Westerhout 49-2 | 36,200 | 1 | O2-3.5If* | |||
| Westerhout 49-3 | 36,200 | 1 | O3-O7V | |||
| Mercer 30-1 A | 40,000 | 1 | O6-7.5lf+ | |||
| US 708 | 60,300 ± 8,500 | 1 | sdOHe | 18.8 |
Magellanic Clouds
The Large Magellanic Cloud (LMC) is around 163 kly distant and the Small Magellanic Cloud (SMC) is around 204 kly distant
| Host galaxy | Star system | Median distance (ly) | Stars in system | Spectral type | Apparent magnitude (V) | Comments and references |
|---|---|---|---|---|---|---|
| LMC | R126a4 | 157,000 | 1 | O3V((f*))(n) | ||
| LMC | R136a5 | 157,000 | 1 | O2l(n)f* | ||
| LMC | R136a6 | 157,000 | 1 | O2I(n)f*p | ||
| LMC | R136a8 | 157,000 | 1 | O2-3V | ||
| LMC | LH 10-3209 A | 160,000 | 1 | O3III(f*) | Part of NGC 1763. | |
| LMC | Melenick 39 A | 160,000 | 1 | O2.5If/WN6 | ||
| LMC | Sk -65° 47 | 160,000 | 1 | O4If | ||
| LMC | Sk -68° 137 | 160,000 | 1 | OB | ||
| LMC | Sk -69° 212 | 160,000 | 1 | O6lf | ||
| LMC | Sk -69° 249 A | 160,000 | 2 | O7lf | ||
| LMC | ST5-31 | 160,000 | 1 | O2-3(n)fp | ||
| LMC | TIC 276934932 | 160,000 | 2 | O3If + O6V | ||
| LMC | R136a7 | 163,000 | 1 | O3III(f*) | ||
| LMC | MACHO 80.7443.1718 B | 163,000 | 2 | O9.5 V | 13.628 | Has a B-type companion. |
| LMC | R136b | 163,000 | 1 | O4If | 13.24 | |
| LMC | LH 54-425 | 163,000 | 2 | O3V + O5V | 13.13 | |
| LMC | HD 269810 | 163,000 | 1 | O2III(f*) | 12.22 | |
| LMC | HSH95-36 | 163,000 | 1 | O2lf* | ||
| LMC | Melnick 42 | 163,000 | 1 | O2If* | 12.78 | Part of Tarantula Nebula. |
| LMC | LMC P3 | 163,000 | 2 | O5III(f) | Has a Neutron Star companion. | |
| LMC | MACHO*05:34:41.3−69:31:39 | 163,000 | 2 | O3If* + O6V | ||
| LMC | BI 253 | 164,000 | 1 | O2V-III(n)((f*)) | 13.76 | |
| LMC | VFTS 243 (2MASS J05380840-6909190) | 164,000 | 1 | O7V(n)((f)) | 15.26 | Has a Known Black Hole Companion |
| LMC | VFTS 102 | 164,000 | 1 | O9:Vnnne | 15.806 | |
| LMC | VFTS 352 | 164,000 | 2 | O4.5 V(n)((fc)):z: + O5.5 V(n)((fc)):z: | 14.38 | |
| LMC | VFTS 506 | 164,000 | 1 | ON2V((n))((f*)) | ||
| LMC | VFTS 621 | 164,000 | 1 | O2V((f*))z | ||
| LMC | VFTS 1021 | 164,000 | 1 | O4 lf+ | ||
| LMC | VFTS 16 | 170,000 | 1 | O2IIIf* | ||
| LMC | LMC X-1 A | 180,000 | 2 | O8 IIIf or O8 f?p | 14.612 ± 0.171 | Has a Black hole Companion. |
| SMC | SMC AB7 | 197,000 | 2 | O6I(f) | 13.016 | |
| SMC | SMC AB8 | 197,000 | 2 | O4V | 12.83 | |
| SMC | HD 5980 C | 200,000 | 3 | OI | 8.8 - 11.9 | Has a LBV and Wolf-Rayet Companion |
| SMC | HD 346-W1 | 200,000 | 1 | O5.5lf | ||
| SMC | HD 346-W3 | 200,000 | 1 | O3V |
Andromeda Galaxy and Triangulum Galaxy
The Andromeda Galaxy (M31) is 2.5 Mly distant and the Triangulum Galaxy is around 3.2 Mly distant
| Host galaxy | Star system | Median distance (ly) | Stars in system | Spectral type | Apparent magnitude (V) | Comments and references |
|---|---|---|---|---|---|---|
| Andromeda | LGGS J004246.86+413336.4 | 2,500,000 | 1 | O3-O5If | ||
| Triangulum | [BMS2003] 867 | 2,700,000 | 2 | O4Iab+O4Ia | ||
| Triangulum | M33 X-7 A | 2,700, 000±70000 | 2 | O7-8III | +18.70 | Has a Black Hole Companion |
| Triangulum | M33-013406.63 (B416/UIT301) | 3,000,000 | 1 | O9.5Ia |
Other Galaxies
| Host Galaxy | Star system | Median distance (ly) | Stars in system | Spectral type | Apparent magnitude (V) | Comments and references |
|---|---|---|---|---|---|---|
| IC 3418 | SDSS J1229+1122 | 550,000,000 | 1 | O | 22.85 |
See also
- List of Wolf-Rayet stars
- List of luminous blue variable stars
- List of nearest stars by spectral type
References
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Barry, Don C. (January 1970), "Spectral Classification of a and F Stars", Astrophysical Journal Supplement, 19: 281, Bibcode:1970ApJS...19..281B, doi:10.1086/190209.
- ^ Frost, E. B. (December 1924), "Fourteen spectroscopic binaries", Astrophysical Journal, 60: 319–320, Bibcode:1924ApJ....60..319F, doi:10.1086/142868.