HD 38282

HD 38282
Observation data
Epoch J2000      Equinox J2000
Constellation Dorado
Right ascension 05h 38m 53.3783s[1]
Declination −69° 02′ 00.896″[1]
Apparent magnitude (V) 11.11[2]
Characteristics
Evolutionary stage Wolf Rayet
Spectral type WN5-6h + WN6-7h[3]
B−V color index −0.13[2]
Astrometry
Radial velocity (Rv)267.5±52.5[4] km/s
Proper motion (μ) RA: 2.033[1] mas/yr
Dec.: 0.926[1] mas/yr
Parallax (π)0.0107 ± 0.0226 mas[1]
Distance163,000 ly
(49,970[5] pc)
Absolute magnitude (MV)−7.96[6]
Details
Mass80-170 + 95-205[3] M☉
Luminosity4,500,000[6] – 6,300,000[3] L☉
Temperature47,000[6] K
Age<2[3] Myr
Other designations
Brey 89, BAT99 118, RMC 144, R144, CPD−69°462, 2MASS J05385338-6902007, HD 38282, GSC 09163-00992,
Database references
SIMBADdata

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]

  1. ^ 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.
  2. ^ a b Cite error: The named reference ucac was invoked but never defined (see the help page).
  3. ^ a b c d e f g Cite error: The named reference sana was invoked but never defined (see the help page).
  4. ^ 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.
  5. ^ Cite error: The named reference nature was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference hainich was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference oh was invoked but never defined (see the help page).
  8. ^ 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