Study of eclipsing binary and multiple systems in OB associations V: MQ Cen in Crux OB1
Abstract
The early-type massive binary MQ Cen (P_{orb}=3.7 d) has been investigated by means of high-resolution (R∼ 48 000) spectral analysis and multi-band (Johnson BVRI and Strömgren vby) light curve modeling. The physical parameters of the components have been found to be M1= 4.26± 0.10 M_{⊙}, R1= 3.72± 0.05 R_{⊙}, T_{eff1}=16 600± 520 K, and M2= 5.14± 0.09 M_{⊙}, R2= 7.32± 0.03 R_{⊙}, T_{eff2}=15 000± 500 K for the primary and secondary, respectively. The orbital inclination is i=87.0± 0.2 deg. The distance to MQ Cen has been derived to be d=2460± 310 pc which locates it in the Crux OB1 association. However, the age of MQ Cen (∼70 Myr) is higher than the one reported for the Crux OB1 association (∼6 Myr). The derived masses are implying a spectral type of B5 for the primary and B4 for the secondary component. Nevertheless, the secondary component, which is more massive, appears to be cooler than the primary component: It has completed its lifetime on the main-sequence and it is now positioned at the turn-off point of the giant branch, meanwhile the less massive primary component is still staying on the main-sequence.
- Publication:
-
Astrophysics and Space Science
- Pub Date:
- September 2019
- DOI:
- 10.1007/s10509-019-3650-9
- arXiv:
- arXiv:1906.01913
- Bibcode:
- 2019Ap&SS.364..162B
- Keywords:
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- Stars: individual MQ Cen;
- Stars: fundamental parameters;
- Binaries: eclipsing;
- Techniques: photometry;
- Techniques: spectroscopy;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 14 pages, 7 figures and 4 tables, accepted for publication in Astrophysics and Space Science