HD 87643
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HD 87643 is the right of the two blue stars. The other is the red giant V368 Car. The red arc is NGC 3199, a Wolf-Rayet nebula around WR 18. |
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | Carina |
| Right ascension | 10h 04m 30.2893s[1] |
| Declination | −58° 39′ 52.077″[1] |
| Apparent magnitude (V) | 8.87[2] (7.4 - 9.8[3]) |
| Characteristics | |
| Spectral type | B3 I[e][4] |
| U−B color index | −0.54[2] |
| B−V color index | +0.69[2] |
| Variable type | INA[3] |
| Astrometry | |
| Proper motion (μ) | RA: −7.7[5] mas/yr Dec.: 3.3[5] mas/yr |
| Distance | 1,500 ± 500[6] pc |
| Absolute magnitude (MV) | −4.1[7] |
| Details[6] | |
| Luminosity | 41,000 L☉ |
| Temperature | 17,000 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 87643 is a B[e] class binary star embedded in a reflection nebula.
The system is described as having "one of the most extreme infrared excesses for this object class. It harbours a large amount of both hot and cold dust, and is surrounded by an extended reflection nebula." and is important for astronomers in their study of stellar formation.[8]
All the properties of HD 87643 are highly uncertain. Its distance has been estimated anywhere from one to six kpc. The General Catalogue of Variable Stars classifies it as an Orion variable, a pre-main sequence star, but other authors consider it to be a supergiant B[e] star. It has been confirmed to be a binary star system with the two stars separated by about 52 AU, but the nature of the companion is unknown.[8]
References
- ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 8.0 8.1 Lua error in package.lua at line 80: module 'strict' not found.
