Westerlund 1-20

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Coordinates: Sky map 16h 47m 04.70s, −45° 51′ 23.96″
Source: Wikipedia, the free encyclopedia.
Westerlund 1-20
Westerlund 1 super star cluster. The location of Wd 1-20 is circled.
Credit: ESO
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension 16h 47m 04.69s[1]
Declination −45° 51′ 23.9″[1]
Characteristics
Evolutionary stage
Red supergiant
Spectral type M3[2] - M6I[3]
Apparent magnitude (J) 6.378
Apparent magnitude (H) 4.381
Apparent magnitude (K) 2.61
Distance
2,600+600
−400 (assumed)[5] pc
Details
Radius858±48[2] R☉
Luminosity101,000±13,000[2] L☉
Temperature3,284 - 3,550[2] K
Other designations
Westerlund 1 W20, Westerlund 1 BKS D, 2MASS J16470468-4551238, Gaia EDR3 5940106007092341120
Database references
SIMBADdata

Westerlund 1-20 (abbreviated to Wd 1-20 or just W20) is a

largest stars discovered so far. This corresponds to a volume 899 million times bigger than the Sun. If placed at the center of the Solar System, the photosphere of Westerlund 1-20 would almost reach the orbit of Jupiter
.

Westerlund 1-20 compared to the other 3 RSGs in the Westerlund 1 star cluster.

The star is classified as a luminous cool

supergiant emitting most of its energy in the infrared spectrum.[6] W20 occupies the upper right corner of the Hertzsprung-Russell diagram. Using the effective temperature of 3,500 K,[1] the bolometric luminosity of 126,000 L☉[1] and the solar effective temperature of 5,772 K,[7] its radius can be calculated using the Stefan-Boltzmann law.[a]

Westerlund 1-20 was observed to have an extended, cometary shaped nebula, similar to the other red supergiant Westerlund 1 W26. It is therefore likely that its morphology was affected by either the intracluster medium or the cluster wind of Westerlund 1.[8] The nebulae of both Westerlund 1-20 and Westerlund 1 W26 are extended outward from the cluster core and most bright at inward direction, indicating the outward cluster wind.[9]

See also

Notes

  1. ^

References

  1. ^
    S2CID 53393926
    .
  2. ^
    doi:10.11606/D.14.2019.tde-12092018-161841
    .
  3. Bibcode:1987A&AS...70..311W
    .
  4. ^
    doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR
    .
  5. S2CID 119465620
    .
  6. ^ "Cl* Westerlund 1 W 20". Simbad.
  7. ^ Williams, D. R. (2013). "Sun Fact Sheet".
  8. ISSN 0004-6361
    .
  9. doi:10.1093/mnrasl/sly046
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