J18094+1646

LAMOSTJ180927.93+164611.8 · Culpan knownhsd

χ²/N = 0.97

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]	54193 ± 2621
log g	6.268 ± 0.146
log n(He)/n(H)	-2.189 ± 0.223
reduced χ²	0.975 over 745 points
radial velocity	-90.0 km s⁻¹
resolution (FWHM)	2.50 Å
lines fitted	15
grids	HE-0.041.fits HE-0.125.fits HE-0.300.fits HE-0.550.fits +9 more
fitted	04/09/2026 18:32:49

Fit — Lei (TLUSTY)

T_eff [K]	65660 ± 11140
log g	5.680 ± 0.060
log n(He)/n(H)	-1.790 ± 0.150
grids	Lei et al. 2020, ApJ 889, 117 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

source file

spec-58634-GACII273N16B1_sp03-210.fits.gz

Gaia astrometry

Gaia DR3 source	4502091509736932608
parallax [mas]	0.3557 ± 0.0962
G	17.729
μ_α [mas/yr]	0.580
μ_δ [mas/yr]	-6.853
l, b	43.596, 16.664

Published (Culpan et al. 2022)

class (Culpan)	sdO
T_eff [K]	58177 ± 1125
log g	6.10 ± 0.06
log y	-2.47 ± 0.24
reference	2021ApJS..256...28L

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-1.46	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-1.30	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-1.23	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-1.19	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-1.17	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-1.15	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-1.14	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-1.13	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-1.41	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	-1.62	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	-1.36	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	-1.26	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	-1.34	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-1.21	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-1.48	-15.0, 15.0	5.1	-15.0, 15.0