Astronomy:MACHO*05:34:41.3−69:31:39

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MACHO*05:34:41.3−69:31:39 is an eclipsing binary star system located in the Large Magellanic Cloud (LMC), within the LH 54 OB association. Comprising two massive early-type O stars, an O3 If* supergiant and an O6 V main-sequence star. It is a rare example of an overcontact binary with a short orbital period. The system is notable for its high stellar masses and strong binary interactions, providing valuable insights into massive star evolution in a low-metallicity environment.[1][2]

Properties

MACHO*05:34:41.3−69:31:39 is an overcontact eclipsing binary with a circular orbit, analyzed using photometric data from the MACHO project and spectroscopic observations. The stars are in an overcontact configuration, filling or exceeding their Roche lobes, which leads to significant interaction and possible mass transfer. The observed masses are lower than those expected for single O3 stars (~100 M⊙), likely due to binary evolution processes.[1][3]

The system exhibits an O'Connell effect in its light curve, with asymmetric maxima and slight variations in eclipse depths, possibly indicating non-equilibrium atmospheres or circumstellar material. Its short orbital period and high masses make it a key target for studying massive binary evolution. The system has been referenced in studies of contact binaries and spectroscopic classifications of early O stars in the LMC.[1]

Significance

As one of the most massive known binaries in the LMC, MACHO*05:34:41.3−69:31:39 offers a unique opportunity to study the evolution of massive stars in a low-metallicity environment, similar to that of the early universe. Its overcontact nature and strong interactions provide constraints for evolutionary models of massive binaries. Further high-resolution spectroscopy and ultraviolet observations have been suggested to refine its parameters and investigate stellar winds or emission features.[4][5][6]

References

  1. ↑ 1.0 1.1 1.2 Cite error: Invalid <ref> tag; no text was provided for refs named ostrov2001
  2. ↑ Ostrov, Pablo G. (2002). "A very massive spectroscopic binary in the LH 54 OB association in the Large Magellanic Cloud". Monthly Notices of the Royal Astronomical Society 336 (1): 309. doi:10.1046/j.1365-8711.2002.05754.x. Bibcode: 2002MNRAS.336..309O. 
  3. ↑ Alcock, C.; Allsman, R. A.; Alves, D.; Axelrod, T. S.; Becker, A. C.; Bennett, D. P.; Cook, K. H.; Freeman, K. C. et al. (1997). "The MACHO Project LMC Variable Star Inventory.V.Classification and Orbits of 611 Eclipsing Binary Stars". The Astronomical Journal 114: 326. doi:10.1086/118477. Bibcode: 1997AJ....114..326A. 
  4. ↑ Menon, Athira; Langer, Norbert; de Mink, Selma E; Justham, Stephen; Sen, Koushik; Szécsi, Dorottya; de Koter, Alex; Abdul-Masih, Michael et al. (2021-09-15). "Detailed evolutionary models of massive contact binaries – I. Model grids and synthetic populations for the Magellanic Clouds" (in en). Monthly Notices of the Royal Astronomical Society 507 (4): 5013–5033. doi:10.1093/mnras/stab2276. ISSN 0035-8711. 
  5. ↑ Neßlinger, Stefan Rainer (2007). Photometric and spectroscopic analysis of extragalactic early-type eclipsing binaries (Thesis). Bibcode:2007PhDT.......133N.
  6. ↑ Walborn, Nolan R.; Howarth, Ian D.; Lennon, Daniel J.; Massey, Philip; Oey, M. S.; Moffat, Anthony F. J.; Skalkowski, Gwen; Morrell, Nidia I. et al. (2002). "A New Spectral Classification System for the Earliest O Stars: Definition of Type O2". The Astronomical Journal 123 (5): 2754. doi:10.1086/339831. Bibcode: 2002AJ....123.2754W. 



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