Melnick 42

Short description: Massive blue supergiant star in the constellation Dorado

Melnick 42

Melnick 42 (annotated in Commons)
Credit: Hubble Space Telescope

Observation data
Equinox J2000.0]] (ICRS)
Constellation | Dorado
Right ascension |  05h 38m 42.12s[1]
Declination | −69° 05′ 55.19″[1]
Apparent magnitude (V) | 12.78[1]
Characteristics
Spectral type | O2If*[2]
B−V color index | +0.08[3]
Astrometry
Radial velocity (Rv)| 173[4] km/s
Distance| 163,000 ly
(49,970[5] pc)
Absolute magnitude (MV)| −7.4[3]
Details
Mass| 189[3] M☉
Radius| 21.1[6] R☉
Luminosity| 3,600,000[3] L☉
Surface gravity (log g)| 3.90[7] cgs
Temperature| 47,300[3] K
Rotational velocity (v sin i)| 240[7] km/s
Age| ~1 million[8] years
Other designations

MK42, Brey 77, BAT99 105, 2MASS J05384212-6905552

Database references
SIMBAD| data
The RMC 136 cluster. Melnick 42 is just above the main cluster in the rightmost image.

Melnick 42 is a massive blue supergiant star in the Tarantula Nebula in the Large Magellanic Cloud located in the constellation Dorado. Although it is only 21 times the size of the sun, its high temperature of 47,300 K makes it one of the most luminous stars of the Tarantula Nebula at 3,600,000 L☉. It is less than two parsecs from the centre of the R136 cluster, although that is well outside the central core.

Mk 42 was originally classified as spectral type WN when it was discovered, then as O3 If. When the slash stars were defined it was given the spectral type O3 If*/WN6. Finally, the introduction of the spectral class O2 and the refinement of slash star classifications led to it being tagged as O2 If*. Although it is given a supergiant luminosity class, it is effectively a main sequence star still burning hydrogen in its core. It is thought to be less than a million years old.[8]

## See also

* List of most massive stars

## References

1. ↑ 1.0 1.1 1.2 Doran, E. I.; Crowther, P. A.; De Koter, A.; Evans, C. J.; McEvoy, C.; Walborn, N. R.; Bastian, N.; Bestenlehner, J. M. et al. (2013). "The VLT-FLAMES Tarantula Survey. XI. A census of the hot luminous stars and their feedback in 30 Doradus". Astronomy & Astrophysics 558: A134. doi:10.1051/0004-6361/201321824. Bibcode: 2013A&A...558A.134D.
2. ↑ Crowther, P. A.; Walborn, N. R. (2011). "Spectral classification of O2-3.5 If*/WN5-7 stars". Monthly Notices of the Royal Astronomical Society 416 (2): 1311. doi:10.1111/j.1365-2966.2011.19129.x. Bibcode: 2011MNRAS.416.1311C.
3. ↑ 3.0 3.1 3.2 3.3 3.4 Bestenlehner, J. M.; Gräfener, G.; Vink, J. S.; Najarro, F.; De Koter, A.; Sana, H.; Evans, C. J.; Crowther, P. A. et al. (2014). "The VLT-FLAMES Tarantula Survey. XVII. Physical and wind properties of massive stars at the top of the main sequence". Astronomy & Astrophysics 570: A38. doi:10.1051/0004-6361/201423643. Bibcode: 2014A&A...570A..38B.
4. ↑ Schnurr, O.; Moffat, A. F. J.; St-Louis, N.; Morrell, N. I.; Guerrero, M. A. (2008). "A spectroscopic survey of WNL stars in the Large Magellanic Cloud: General properties and binary status". Monthly Notices of the Royal Astronomical Society 389 (2): 806. doi:10.1111/j.1365-2966.2008.13584.x. Bibcode: 2008MNRAS.389..806S.
5. ↑ Pietrzyński, G et al. (7 March 2013). "An eclipsing-binary distance to the Large Magellanic Cloud accurate to two per cent". Nature 495 (7439): 76–79. doi:10.1038/nature11878. PMID 23467166. Bibcode: 2013Natur.495...76P.
6. ↑ Hainich, R.; Rühling, U.; Todt, H.; Oskinova, L. M.; Liermann, A.; Gräfener, G.; Foellmi, C.; Schnurr, O. et al. (2014). "The Wolf-Rayet stars in the Large Magellanic Cloud: A comprehensive analysis of the WN class". Astronomy & Astrophysics 565: A27. doi:10.1051/0004-6361/201322696. Bibcode: 2014A&A...565A..27H.
7. ↑ 7.0 7.1 Puls, J.; Kudritzki, R.-P.; Herrero, A.; Pauldrach, A. W. A.; Haser, S. M.; Lennon, D. J.; Gabler, R.; Voels, S. A. et al. (1996). "O-star mass-loss and wind momentum rates in the Galaxy and the Magellanic Clouds Observations and theoretical predictions". Astronomy and Astrophysics 305: 171. Bibcode: 1996A&A...305..171P.
8. ↑ 8.0 8.1 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. doi:10.1111/j.1365-2966.2010.17167.x. Bibcode: 2010MNRAS.408..731C.

* v
* t
* e

Dorado constellation

Stars
(list)|

| Bayer|

* α
* β
* γ
* δ
* ε
* ζ
* η1
* η2
* θ
* κ
* λ
* ν
* π1
* π2

|

Variable|

* R
* S
* RW
* WZ
* XY
* XZ
* AA
* AB
* AZ
* BB

HR|

* 1227
* 1365
* 1405
* 1540
* 1597
* 1598
* 1859
* 1882
* 1917
* 1936
* 2073
* 2102
* 2408

HD|

* 28254
* 30177
* 33579
* 34664
* 36402
* 37974
* 38282
* 38344
* 38489
* 39194
* 269810
* 269858
* 269908

Gliese|

* Gliese 163
* Gliese 167

Other|

* A0538-66
* BAT99-66
* BAT99-68
* BAT99-98
* BAT99-104
* BE 381
* BI 253
* CAL-83
* HE 0437-5439
* HV 883
* LH41-1042
* LH54-425
* LMC195-1
* LMC X-1
* LMC X-2
* LMC X-3
* LMC X-4
* Melnick 34
* Melnick 42
* PSR J0537−6910
* PSR J0540−6919
* R85
* R84
* R99
* R134
* R136a1
* R136a2
* R136a3
* R136a5
* R136b
* R136c
* R139
* R145
* SGR 0525−66
* VFTS 102
* VFTS 352
* VFTS 682
* WASP-62
* WOH G64

Former|

* Sanduleak -69 202 (exploded in 1987)

Star
clusters|

| Association|

* NGC 1712
* NGC 1731
* NGC 1747
* NGC 1748
* NGC 1761
* NGC 1763
* NGC 1769
* NGC 1787
* NGC 1869
* NGC 1871
* NGC 1873
* NGC 1898
* NGC 1910
* NGC 1923
* NGC 1925
* NGC 1935
* NGC 1937
* NGC 1948
* NGC 1955
* NGC 1968
* NGC 2001
* NGC 2014
* NGC 2015
* NGC 2021
* NGC 2033
* NGC 2034
* NGC 2040
* NGC 2044
* NGC 2050
* NGC 2055
* NGC 2074
* NGC 2093

|

Open|

* Hodge 301
* LH 95
* NGC 1641
* NGC 1649
* NGC 1676
* NGC 1693
* NGC 1695
* NGC 1697
* NGC 1698
* NGC 1704
* NGC 1712
* NGC 1718
* NGC 1732
* NGC 1733
* NGC 1734
* NGC 1735
* NGC 1743
* NGC 1745
* NGC 1749
* NGC 1755
* NGC 1764
* NGC 1767
* NGC 1768
* NGC 1772
* NGC 1774
* NGC 1776
* NGC 1782
* NGC 1785
* NGC 1793
* NGC 1795
* NGC 1801
* NGC 1804
* NGC 1810
* NGC 1814
* NGC 1816
* NGC 1820
* NGC 1822
* NGC 1825
* NGC 1826
* NGC 1828
* NGC 1829
* NGC 1830
* NGC 1834
* NGC 1835
* NGC 1836
* NGC 1838
* NGC 1839
* NGC 1842
* NGC 1844
* NGC 1846
* NGC 1847
* NGC 1849
* NGC 1850
* NGC 1852
* NGC 1854/1855
* NGC 1856
* NGC 1858
* NGC 1859
* NGC 1860
* NGC 1862
* NGC 1863
* NGC 1864
* NGC 1865
* NGC 1867
* NGC 1870
* NGC 1872
* NGC 1874
* NGC 1876
* NGC 1877
* NGC 1880
* NGC 1881
* NGC 1882
* NGC 1885
* NGC 1887
* NGC 1894
* NGC 1895
* NGC 1897
* NGC 1900
* NGC 1901
* NGC 1902
* NGC 1903
* NGC 1905
* NGC 1911
* NGC 1913
* NGC 1915
* NGC 1916
* NGC 1917
* NGC 1919
* NGC 1920
* NGC 1922
* NGC 1926
* NGC 1928
* NGC 1929
* NGC 1932
* NGC 1940
* NGC 1941
* NGC 1942
* NGC 1946
* NGC 1949
* NGC 1951
* NGC 1953
* NGC 1958
* NGC 1966
* NGC 1967
* NGC 1969
* NGC 1971
* NGC 1972
* NGC 1974
* NGC 1983
* NGC 1984
* NGC 1994
* NGC 1997
* NGC 2002
* NGC 2003
* NGC 2004
* NGC 2005
* NGC 2006
* NGC 2009
* NGC 2011
* NGC 2027
* NGC 2041
* NGC 2042
* NGC 2053
* NGC 2062
* NGC 2070
* NGC 2077
* NGC 2079
* NGC 2083
* NGC 2084
* NGC 2085
* NGC 2086
* NGC 2088
* NGC 2091
* NGC 2092
* NGC 2094
* NGC 2095
* NGC 2096
* NGC 2097
* NGC 2098
* NGC 2100
* NGC 2102
* NGC 2105
* NGC 2109
* NGC 2113
* NGC 2114
* NGC 2116
* NGC 2117
* NGC 2118
* NGC 2120
* NGC 2123
* NGC 2125
* NGC 2127
* NGC 2130
* NGC 2135
* NGC 2136
* NGC 2137
* NGC 2138
* NGC 2140
* NGC 2147
* NGC 2151
* NGC 2153
* NGC 2154
* NGC 2155
* NGC 2157
* NGC 2160
* NGC 2164
* NGC 2166
* NGC 2172
* NGC 2176
* NGC 2177
* NGC 2181
* NGC 2193
* NGC 2197
* NGC 2214
* NGC 2241

Globular|

* Hodge 11
* NGC 1644
* NGC 1652
* NGC 1696
* NGC 1756
* NGC 1783
* NGC 1786
* NGC 1805
* NGC 1806
* NGC 1818
* NGC 1831
* NGC 1866
* NGC 1868
* NGC 1978
* NGC 2108
* NGC 2156
* NGC 2159
* NGC 2162
* NGC 2210
* NGC 2231
* NGC 2249
* NGC 2257

Nebulae|

| H II|

* N119
* N180B
* N11
* N159
* N44
* N55
* NGC 1722
* NGC 1722
* NGC 1727
* NGC 1737
* NGC 1760
* NGC 1770
* NGC 1773
* NGC 1899
* NGC 1934
* NGC 1936
* NGC 2030
* NGC 2032
* NGC 2080
* NGC 2081
* Tarantula Nebula

|

Planetary|

* LMC-N66

SNR|

* Honeycomb Nebula
* LMC N49
* NGC 1918
* NGC 2029
* NGC 2060
* SNR 0509-67.5

Galaxies|

| NGC|

* 1500
* 1506
* 1515
* 1522
* 1533
* 1546
* 1549
* 1553
* 1556
* 1566
* 1578
* 1581
* 1596
* 1602
* 1617
* 1669
* 1672
* 1688
* 1703
* 1706
* 1765
* 1771
* 1796
* 1809
* 1824
* 1853
* 1892
* 1947
* 2082
* 2150
* 2187
* 2228
* 2229
* 2230
* 2233
* 2235

|

Other|

* IC 2082
* LEDA 89996

Partly in Mensa|

Large Magellenic Cloud

Galaxy clusters|

* NGC 1566 Group

Other|

* GRB 790305b

0.00

(0 votes)

Original source: https://en.wikipedia.org/wiki/Melnick 42. Read more

|

Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:Melnick_42&oldid=1095384"
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template