J17427+4430

LAMOSTJ174242.39+443013.4 · Culpan knownhsd

χ²/N = 1.03

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]	38564 ± 1224
log g	5.708 ± 0.148
log n(He)/n(H)	-2.217 ± 0.250
reduced χ²	1.027 over 638 points
radial velocity	129.0 km s⁻¹
resolution (FWHM)	2.50 Å
lines fitted	12
grids	HE-0.041.fits HE-0.125.fits HE-0.300.fits HE-0.550.fits +9 more
fitted	04/09/2026 18:32:41

Fit — Lei (TLUSTY)

T_eff [K]	37500 ± 480
log g	5.560 ± 0.150
log n(He)/n(H)	-2.410 ± 0.230
grids	Lei et al. 2019, ApJ 881, 135 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

source file

spec-57875-HD175209N425125B02_sp16-221.fits.gz

Gaia astrometry

Gaia DR3 source	1350113181268869632
parallax [mas]	0.4101 ± 0.0464
G	16.002
G_abs	4.035
μ_α [mas/yr]	2.270
μ_δ [mas/yr]	-4.263
l, b	70.692, 30.474

Published (Culpan et al. 2022)

class (Culpan)	sdOB
T_eff [K]	40247 ± 401
log g	6.09 ± 0.05
log y	-2.17 ± 0.07
reference	2021ApJS..256...28L

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	2.09	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	1.87	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	1.76	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	1.71	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	1.67	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	1.65	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	1.63	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	1.62	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	2.02	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	1.92	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	1.73	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	2.12	-15.0, 15.0	5.1	-15.0, 15.0