HIP 15429: A newborn Be star on an eccentric binary orbit

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Volume 701 (September 2025)

A&A, 701 (2025) A9

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Table 1.

Orbital and physical parameters and uncertainties of the binary system and its component stars.

Parameters of the binary system
Orbital period	P [d]	221 ± 1
Eccentricity	e	0.52 ± 0.03
Mass ratio	$q = \frac{M_{B}}{M_{Be}}$ $q = \nicefrac{M_{\mathrm{B}}}{M_{\mathrm{Be}}}$
– evolutionary	$q_{evol} = \frac{M_{B, evol}}{M_{Be, dyn}}$ $q_{\mathrm{evol}}= \nicefrac{M_{\mathrm{B, evol}}}{M_{\mathrm{Be, dyn}}}$	≤0.14
– spectroscopic	$q_{spec} = \frac{M_{B, spec}}{M_{Be, dyn}}$ $q_{\mathrm{spec}}=\nicefrac{M_{\mathrm{B, spec}}}{M_{\mathrm{Be, dyn}}}$	≤0.10
– dynamic	$q_{dyn} = \frac{K_{Be}}{K_{B}}$ $q_{\mathrm{dyn}}=\nicefrac{K_{\mathrm{Be}}}{K_{\mathrm{B}}}$	0.066 ± 0.053
Barycentric velocity	v₀ [km s⁻¹]	62.3 ± 1.0
Distance	d [pc]	1730 ± 260

Parameters of B star
Effective temperature	T_eff,B [kK]	13.5 ± 0.5
Surface gravity	log(g_B/cm s⁻²)	2.25 ± 0.25
Rotation velocity	v_rot, Bsini [km s⁻¹]	≤30
Macroturbulent velocity	v_mac,B [km s⁻¹]	≤50
Microturbulent velocity	v_mic,B [km s⁻¹]	10.0 (fixed)
Continuum flux ratio	f_B/f_tot(4300 Å)	0.60 ± 0.08
Radius	R_B [R_⊙]	$9 . 0_{- 1.7}^{+ 2.1}$ $9.0^{+2.1}_{-1.7}$
Bolometric luminosity	L_B [L_⊙]	$2300_{- 800}^{+ 1300}$ $2300^{+1300}_{-800}$
Spectroscopic mass	M_B, spec [M_⊙]	$0 . 69_{- 0.31}^{+ 0.63}$ $0.69^{+0.63}_{-0.31}$
Evolutionary mass	M_B, evol [M_⊙]	0.99 ± 0.11
RV semi-amplitude	K_B [km s⁻¹]
– orbit model		74.1 ± 2.2
– disentangling		76.0 ± 0.9

Parameters of the Be star
Effective temperature	T_eff,Be [kK]	$17_{- 1}^{+ 2}$ $17^{+2}_{-1}$
Surface gravity	log(g_Be/cm s⁻²)	4.0 ± 0.5
Rotation velocity	v_rot, Besini [km s⁻¹]	270 ± 70
Macroturbulent velocity	v_mac,Be [km s⁻¹]	50 (fixed)
Microturbulent velocity	v_mic,Be [km s⁻¹]	2 (fixed)
Continuum flux ratio	f_Be/f_tot(4300 Å)	0.40 ± 0.08
Radius	R_Be [R_⊙]	$6 . 0_{- 1.3}^{+ 1.6}$ $6.0^{+1.6}_{-1.3}$
Bolometric luminosity	L_Be [L_⊙]	$2700_{- 1100}^{+ 1600}$ $2700^{+1600}_{-1100}$
Spectroscopic mass	M_Be, spec [M_⊙]	$10 . 5_{- 7.1}^{+ 21.5}$ $10.5^{+21.5}_{-7.1}$
Evolutionary mass	M_Be, evol [M_⊙]	6.5 ± 0.9
Min. dynamic mass	M_Be, dyn [M_⊙]	≥7.0
RV semi-amplitude	K_Be [km s⁻¹]	5 ± 4

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