J07257+5243

LAMOSTJ072542.83+524325.6 · 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]	25663 ± 180
log g	5.481 ± 0.028
log n(He)/n(H)	-3.379 ± 0.107
reduced χ²	0.991 over 658 points
radial velocity	-166.0 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 18:28:27

Fit — Lei (TLUSTY)

T_eff [K]	25000 ± 170
log g	5.500 ± 0.020
log n(He)/n(H)	-3.000 ± 0.000
grids	Lei et al. 2019, ApJ 881, 135 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid
helium	published as a limit

Observation

cosmic rays	8 pixels cancelled
source file	spec-57477-GAC112N51B1_sp15-232.fits.gz

Gaia astrometry

Gaia DR3 source	986474685615378816
parallax [mas]	0.8336 ± 0.0453
G	15.289
G_abs	4.943
μ_α [mas/yr]	-1.612
μ_δ [mas/yr]	-7.105
l, b	164.851, 26.305

Published (Culpan et al. 2022)

class (Culpan)	sdB
T_eff [K]	23668 ± 250
log g	5.10 ± 0.03
log y	-3.50 ± 0.08
reference	2021ApJS..256...28L

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-2.69	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-2.40	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-2.27	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-2.20	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-2.15	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-2.12	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-2.10	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-2.09	-13.0, 13.0	3.9	-11.7, 11.6
H_κ	3750.15	-2.08	-10.0, 10.0	3.9	-7.4, 8.7
He II 4686	4685.70	-2.59	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	-2.48	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-2.23	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-2.73	-15.0, 15.0	5.1	-15.0, 15.0