J02057+4036

LAMOSTJ020547.47+403639.6 · Culpan knownhsd

χ²/N = 0.99

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]	34875 ± 814
log g	5.418 ± 0.098
log n(He)/n(H)	-2.268 ± 0.208
reduced χ²	0.994 over 640 points
radial velocity	32.0 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 18:25:45

Fit — Lei (TLUSTY)

T_eff [K]	33200 ± 420
log g	5.500 ± 0.100
log n(He)/n(H)	-2.440 ± 0.180
grids	Lei et al. 2020, ApJ 889, 117 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

source file

spec-58135-GACII029N40B1_sp06-045.fits.gz

Gaia astrometry

Gaia DR3 source	344794339527216000
parallax [mas]	0.2779 ± 0.1075
G	17.630
μ_α [mas/yr]	1.064
μ_δ [mas/yr]	-0.645
l, b	137.864, -20.095

Published (Culpan et al. 2022)

class (Culpan)	sdB
T_eff [K]	34993 ± 390
log g	5.45 ± 0.07
log y	-2.33 ± 0.08
reference	2021ApJS..256...28L

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	0.52	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	0.46	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	0.44	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	0.42	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	0.42	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	0.41	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	0.41	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	0.40	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	0.50	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	0.48	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	0.43	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	0.53	-15.0, 15.0	5.1	-15.0, 15.0