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HD 38282
Observation data; Epoch J2000 Equinox J2000
Constellation	Dorado
Right ascension	05h 38m 53.3783s
Declination	−69° 02′ 00.896″
Apparent magnitude (V)	11.11
Characteristics
Evolutionary stage	Wolf Rayet
Spectral type	WN5-6h + WN6-7h
B−V color index	−0.13
Astrometry
Radial velocity (Rv)	267.5±52.5 km/s
Proper motion (μ)	RA: 2.033 mas/yr ; Dec.: 0.926 mas/yr
Parallax (π)	0.0107 ± 0.0226 mas
Distance	163,000 ly ; (49,970 pc)
Absolute magnitude (MV)	−7.96
Details
Mass	80-170 + 95-205 M☉
Luminosity	4,500,000 – 6,300,000 L☉
Temperature	47,000 K
Age	<2 Myr
Other designations
	Brey 89, BAT99 118, RMC 144, R144, CPD−69°462, 2MASS J05385338-6902007, HD 38282, GSC 09163-00992,
Database references
SIMBAD	data

HD 38282 (R144, BAT99-118, Brey 89) is a massive spectroscopic binary star in the Tarantula Nebula (Large Magellanic Cloud), consisting of two hydrogen-rich Wolf-Rayet stars.

R144 is located near the R136 cluster at the center of NGC 2070 and may have been ejected from it after an encounter with another massive binary.^[7] It shares a common X-ray cavity with the R146 (HD 269926) and R147 (HD 38344) Wolf-Rayet star systems.^[8]

Both components of R144 are detected in the spectrum and both are WNh stars, very hot stars with strong emission lines due to their strong stellar winds. The orbit has not been determined, but is likely to be between two and six months long, possibly more if it is eccentric. The primary, slightly hotter, star is observed to be the less massive of the two.^[3]

Each star is amongst the most luminous known, but the exact parameters of each has not been determined. Their combined luminosity is around 4,500,000 L_☉^[6] to 6,300,000 L_☉.^[3] The masses have not yet been calculated accurately from the orbital parameters, but the stars have been modelled to initially have been around 260 M_☉ and 175 M_☉. Depending on their exact age, this has now decreased to between 90 M_☉ and 170 M_☉ for the primary and 95 M_☉ and 205 M_☉ for the secondary.^[3]

References

^ ^a ^b ^c ^d ^e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ ^a ^b Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (2012). "VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012)". VizieR On-line Data Catalog: I/322A. Originally Published in: 2012yCat.1322....0Z; 2013AJ....145...44Z. 1322. Bibcode:2012yCat.1322....0Z.
^ ^a ^b ^c ^d ^e ^f ^g Sana, H.; Van Boeckel, T.; Tramper, F.; Ellerbroek, L. E.; De Koter, A.; Kaper, L.; Moffat, A. F. J.; Schnurr, O.; Schneider, F. R. N.; Gies, D. R. (2013). "R144 revealed as a double-lined spectroscopic binary". Monthly Notices of the Royal Astronomical Society: Letters. 432: L26 – L30. arXiv:1304.4591. Bibcode:2013MNRAS.432L..26S. doi:10.1093/mnrasl/slt029. S2CID 119238483.
^ Roman-Duval, Julia; Jenkins, Edward B.; Tchernyshyov, Kirill; Williams, Benjamin; Clark, Christopher J. R.; Gordon, Karl D.; Meixner, Margaret; Hagen, Lea; Peek, Joshua; Sandstrom, Karin; Werk, Jessica; Yanchulova Merica-Jones, Petia (2021). "METAL: The Metal Evolution, Transport, and Abundance in the Large Magellanic Cloud Hubble Program. II. Variations of Interstellar Depletions and Dust-to-gas Ratio within the LMC". The Astrophysical Journal. 910 (2): 95. arXiv:2101.09399. Bibcode:2021ApJ...910...95R. doi:10.3847/1538-4357/abdeb6. S2CID 234355905.
^ Pietrzyński, G; D. Graczyk; W. Gieren; I. B. Thompson; B. Pilecki; A. Udalski; I. Soszyński; et al. (7 March 2013). "An eclipsing-binary distance to the Large Magellanic Cloud accurate to two per cent". Nature. 495 (7439): 76–79. arXiv:1303.2063. Bibcode:2013Natur.495...76P. doi:10.1038/nature11878. PMID 23467166. S2CID 4417699.
^ ^a ^b ^c ^d Hainich, R.; Rühling, U.; Todt, H.; Oskinova, L. M.; Liermann, A.; Gräfener, G.; Foellmi, C.; Schnurr, O.; Hamann, W. -R. (2014). "The Wolf-Rayet stars in the Large Magellanic Cloud: A comprehensive analysis of the WN class". arXiv:1401.5474v1 [astro-ph.SR].
^ Oh, Seungkyung; Kroupa, Pavel; Banerjee, Sambaran (2014). "R144: A very massive binary likely ejected from R136 through a binary-binary encounter". Monthly Notices of the Royal Astronomical Society. 437 (4): 4000. arXiv:1311.2934. Bibcode:2014MNRAS.437.4000O. doi:10.1093/mnras/stt2219. S2CID 118708404.
^ Van Gelder, M. L.; Kaper, L.; Japelj, J.; Ramírez-Tannus, M. C.; Ellerbroek, L. E.; Barbá, R. H.; Bestenlehner, J. M.; Bik, A.; Gräfener, G.; De Koter, A.; De Mink, S. E.; Sabbi, E.; Sana, H.; Sewiło, M.; Vink, J. S.; Walborn, N. R. (2020), "VLT/X-shooter spectroscopy of massive young stellar objects in the 30 Doradus region of the Large Magellanic Cloud", Astronomy & Astrophysics, 636: A54, arXiv:2002.02690, Bibcode:2020A&A...636A..54V, doi:10.1051/0004-6361/201936361, S2CID 211066451