An absence of binary companions to Wolf-Rayet stars in the Small Magellanic Cloud - Implications for mass loss and black hole masses at low metallicities

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Volume 689 (September 2024)

A&A, 689 (2024) A157

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Table 3.

Initial masses and He core masses found for the SMC WR stars.

	M_core/M_⊙	M_ini/M_⊙	M_core/M_⊙	M_ini/M_⊙
Based on:	Potsdam	Potsdam	Martins	Martins
Single:
SMC AB1	31.6 $_{- 8.3}^{+ 11.4}$ $^{+11.4}_{-8.3}$	63.8 $_{- 14.1}^{+ 18.7}$ $^{+18.7}_{-14.1}$	21.7 $_{- 4.2}^{+ 5.1}$ $^{+5.1}_{-4.2}$	47.1 $_{- 7.1}^{+ 8.7}$ $^{+8.7}_{-7.1}$
SMC AB2 ^(a)	16.3 $_{- 2.1}^{+ 2.4}$ $^{+2.4}_{-2.1}$	37.9 $_{- 3.6}^{+ 4.1}$ $^{+4.1}_{-3.6}$	13.3 $_{- 1.7}^{+ 1.9}$ $^{+1.9}_{-1.7}$	32.6 $_{- 2.9}^{+ 3.3}$ $^{+3.3}_{-2.9}$
SMC AB4 ^(a)	18.4 $_{- 2.4}^{+ 2.8}$ $^{+2.8}_{-2.4}$	41.4 $_{- 4.2}^{+ 4.8}$ $^{+4.8}_{-4.2}$	21.3 $_{- 2.9}^{+ 3.4}$ $^{+3.4}_{-2.9}$	46.5 $_{- 5.0}^{+ 5.8}$ $^{+5.8}_{-5.0}$
SMC AB9	29.6 $_{- 7.8}^{+ 10.6}$ $^{+10.6}_{-7.8}$	60.5 $_{- 13.4}^{+ 17.5}$ $^{+17.5}_{-13.4}$	16.6 $_{- 3.1}^{+ 3.9}$ $^{+3.9}_{-3.1}$	38.4 $_{- 5.5}^{+ 6.7}$ $^{+6.7}_{-5.5}$
SMC AB10	19.5 $_{- 4.7}^{+ 6.2}$ $^{+6.2}_{-4.7}$	43.4 $_{- 8.2}^{+ 10.6}$ $^{+10.6}_{-8.2}$	12.9 $_{- 2.4}^{+ 2.9}$ $^{+2.9}_{-2.4}$	31.9 $_{- 4.1}^{+ 5.0}$ $^{+5.0}_{-4.1}$
SMC AB11	25.5 $_{- 6.4}^{+ 8.6}$ $^{+8.6}_{-6.4}$	53.6 $_{- 11.0}^{+ 14.4}$ $^{+14.4}_{-11.0}$	12.3 $_{- 2.2}^{+ 2.7}$ $^{+2.7}_{-2.2}$	30.9 $_{- 3.9}^{+ 4.8}$ $^{+4.8}_{-3.9}$
SMC AB12	26.5 $_{- 6.8}^{+ 9.1}$ $^{+9.1}_{-6.8}$	55.3 $_{- 11.5}^{+ 15.2}$ $^{+15.2}_{-11.5}$
Binary:
SMC AB3	24.7 $_{- 1.8}^{+ 1.9}$ $^{+1.9}_{-1.8}$	52.2 $_{- 3.0}^{+ 3.2}$ $^{+3.2}_{-3.0}$
SMC AB5 ^(a)	43.1 $_{- 6.8}^{+ 7.8}$ $^{+7.8}_{-6.8}$	82.8 $_{- 10.8}^{+ 12.6}$ $^{+12.6}_{-10.8}$
SMC AB6	22.9 $_{- 3.1}^{+ 3.6}$ $^{+3.6}_{-3.1}$	49.2 $_{- 5.3}^{+ 6.1}$ $^{+6.1}_{-5.3}$
SMC AB7	30.4 $_{- 4.4}^{+ 5.1}$ $^{+5.1}_{-4.4}$	61.8 $_{- 7.3}^{+ 8.5}$ $^{+8.5}_{-7.3}$
SMC AB8 ^(b)	35	80

Notes. The errors on M_core and M_ini are correlated. Potsdam refers to Hainich et al. (2015) for the single stars and Shenar et al. (2016) for the binaries. Martins refers to Martins et al. (2009) and Martins (2023). Notes have the following meaning.

^(a)

Object has a surface temperature that matches both H-core and He-core burning models.

^(b)

Values from Wang et al. (2019).

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