J09104+1208

Culpan hotsd

χ²/N = 0.96

Spectrum

shaded: the intervals the fit used · │ a cancelled pixeldrag on either panel to zoom · dbl-click or Esc to reset · arrows to pan

The whole reduced spectrum above, the region marked on it below. Shaded bands are the intervals the fit used; a tick under the axis marks a pixel the rejection mask cancelled.

Line-profile fit — Bamberg

Observed spectrum in black, model in red, offset by line. Balmer series left, helium right.

Results and provenance

Fit — Bamberg

T_eff [K]	26292 ± 105
log g	5.383 ± 0.016
log n(He)/n(H)	-2.769 ± 0.037
reduced χ²	0.962 over 656 points
radial velocity	-85.0 km s⁻¹
resolution (FWHM)	2.50 Å
lines fitted	13
grids	HE-0.041.fits HE-0.125.fits HE-0.300.fits HE-0.550.fits +9 more
fitted	04/09/2026 18:29:33

Fit — Lei (TLUSTY)

T_eff [K]	27430 ± 110
log g	5.360 ± 0.010
log n(He)/n(H)	-2.820 ± 0.050
grids	Lei et al. 2018, ApJ 868, 70 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

cosmic rays	3 pixels cancelled
source file	spec-57790-HD090744N104005B01_sp09-080.fits.gz

Gaia astrometry

Gaia DR3 source	604238612204857088
parallax [mas]	1.1204 ± 0.0350
G	13.912
BP − RP	-0.377
G_abs	4.159
μ_α [mas/yr]	-5.888
μ_δ [mas/yr]	0.072
RUWE	1.008
l, b	217.692, 36.285
selection	f_plx

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-1.38	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-1.23	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-1.16	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-1.13	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-1.10	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-1.09	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-1.08	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-1.07	-13.0, 13.0	3.9	-11.7, 11.6
H_κ	3750.15	-1.06	-10.0, 10.0	3.9	-7.4, 8.7
He II 4686	4685.70	-1.33	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	-1.27	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-1.14	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-1.40	-15.0, 15.0	5.1	-15.0, 15.0