Quantitative spectroscopy of multiple OB stars - I. The quadruple system HD 37061 at the centre of Messier 43

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Table 3

Stellar parameters of the stars in the HD 37061 system.

Object	T_eff	log 𝑔 ^(a)	y	$\frac{ξ v \sin ζ}{km s^{- 1}}$ ${{\xi \,\,\,\,\,\,v\sin \,\,\,\,\,\,\,\,\zeta } \over {{\rm{km}}{{\rm{s}}^{ - 1}}}}$			R_V	E (B – V)	B.C.	M_evol	R	log L/L_⊙	log τ_evol	d_spec	d_Gaia^(b)
	kK	(cgs)	by number					mag	mag	M_⊙	R_⊙		yr	pc	pc
HD 37061							4.75	0.51						415	416
	±						0.10	0.02						29	10
HD 37061 Aa	31.1	4.15	0.100	6	190	20			−2.94	16.4	5.7	4.43	6.5
	± 0.5	0.05	0.006	2	10	3			0.04	0.4	0.3	0.04	0.2
HD37061 Ab	15.7	4.28	0.114	1	8	2			−1.32	4.4	2.5	2.54	>6.0
	± 0.5	0.10	0.010	2	3	1			0.08	0.2	0.3	0.08
HD37061 C	22.3	4.25	0.101	2	104	20			−2.21	8.1	3.6	3.45	6.7
	± 0.5	0.10	0.011	2	10	5			0.06	0.4	0.4	0.08	1.0

HD37061 B	14.0	4.28	0.100	2	180	20			−1.02	3.8	2.3	2.27

Notes. The first row lists parameters for the whole system. Uncertainties are 1 σ values. ^(a)The values of log 𝑔 have not been corrected for centrifugal acceleration. ^(b)Gaia Collaboration (2016, 2023).

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