Spectral analysis of HD 49798, a bright, hydrogen-deficient sdO-type donor star in an accreting X-ray binary

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Table 4

Parameters of HD 49798.

	This work	Krtička et al. (2019)
	T_eff/K	45 000 ± 1000		45 900 ± 800
	log (g/cm/s²)	4.46 ± 0.10		4.56 ± 0.08
	L/L_☉	$4360_{- 456}^{+ 509}$ $4360_{-456}^{+509}$
	M/M_☉	$1 . 14_{- 0.24}^{+ 0.30}$ $1.14_{-0.24}^{+0.30}$		1.46 ± 0.32
	R/R_☉	$1 . 09_{- 0.10}^{+ 0.11}$ $1.09_{-0.10}^{+0.11}$		1.05 ± 0.06
	d^a/pc	$496_{- 0.83}^{+ 0.82}$ $496_{-0.83}^{+0.82}$		508 ± 17
	v_rot/km/s	37.5 ± 5.0		40 ± 5

Abundances

This work			Krtička et al. (2019)

	num	mass	num	mass

H	−0.30 ± 0.03	−0.70 ± 0.03	−0.24	−0.60
He	−0.31 ± 0.03	−0.11 ± 0.03	−0.37 ± 0.04	−0.13 ± 0.02
C	−4.92 ± 0.1	−4.25 ± 0.1	−4.44^b	−3.72^b
N	−3.10 ± 0.1	−2.36 ± 0.1	−3.34 ± 0.2	−2.56 ± 0.2
O	−4.90 ± 0.1	−4.10 ± 0.1	−4.84 ± 0.2	−4.00 ± 0.2
Ne	−3.26 ± 0.1	−2.36 ± 0.1	−	−
Mg	−4.24 ± 0.1	−3.26 ± 0.1	−4.44	−3.42
Al	−5.21 ± 0.1	−4.18 ± 0.1	−5.14 ± 0.4	−4.07 ± 0.4
Si	−3.72 ± 0.1	−2.68 ± 0.1	−4.34 ± 0.4	−3.25 ± 0.4
P	−5.58 ± 0.1	−4.50 ± 0.1	−	−
S	−3.61 ± 0.1	−2.51 ± 0.1	−	−
Cr	−5.42 ± 0.2	−4.11 ± 0.2	−	−
Mn	−5.52 ± 0.2	−4.18 ± 0.2	−	−
Fe	−3.57 ± 0.1	−2.23 ± 0.1	−4.14 ± 0.2	−2.75 ± 0.2
Ni	−4.58 ± 0.1	−3.22 ± 0.1	−5.24 ± 0.1	−3.83 ± 0.1

Notes. Our values are compared to the analysis of Krtička et al. (2019). “<” denotes an upper limit, “–” indicates that no abundance was determined. The abundances are given as log number fraction (num) and log mass fraction (mass). ^(a) Spectroscopic distance. ^(b) Upper limit.

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