50 Dra: Am-type twins with additional variability in a non-eclipsing system

Open Access

Table 1.

Basic characteristics of 50 Dra.

HD 175286, TIC 424391564,

Gaia DR3 2268467486545969792
ID	Value	Source
RA_J2000 (^hh:^mm:^ss)	18:46:22.24	1
Dec_J2000 (° : ′ : ″)	+75:26:02.24	1
Tycho V_T (mag)	5.358(1)	2
Tycho B_T (mag)	5.409(14)	2
TESS T (mag)	5.345 (7)	3
GaiaG (mag)	5.357(3)	4
μ_αcosδ (mas yr⁻¹)	17.06(14)	4
μ_δ (mas yr⁻¹)	70.39(15)	4
Parallax (mas)	11.42(11)	4
γ (km s⁻¹)	–8.79(49)	5
	–7.8	6
	–8.8(2.8)	7
T_eff (K)	9150(142)	3
	9572 $_{- 297}^{+ 128}$ $^{+128}_{-297}$	4
	9130 $_{- 262}^{+ 290}$ $^{+290}_{-262}$	SED
[Fe/H] (dex)	0.22 $_{- 0.14}^{+ 0.21}$ $^{+0.21}_{-0.14}$	4
	-0.07 $_{- 0.23}^{+ 0.21}$ $^{+0.21}_{-0.23}$	SED
log g (cm s⁻²)	3.97(67)	3
	3.935 $_{- 0.028}^{+ 0.024}$ $^{+0.024}_{-0.028}$	4
	3.90 $_{- 0.33}^{+ 0.33}$ $^{+0.33}_{-0.33}$	SED

Notes. Effective temperature T_eff and surface gravity log g corresponds with the assumption of a single star. References: 1 – Gaia Collaboration (2021), 2 – Høg et al. (2000), 3 – Paegert et al. (2021), 4 – Gaia Collaboration (2023), 5 – Harper (1919), 6 – Wilson (1953), 7 – Gontcharov (2006), SED – this work (spectra energy distribution fitting).

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