J23426+4354

SDSSJ234240.63+435439.8 · Culpan knownhsd

χ²/N = 1.00

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]	42897 ± 656
log g	5.561 ± 0.054
log n(He)/n(H)	-2.955 ± 0.177
reduced χ²	1.005 over 742 points
radial velocity	116.0 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 18:34:22

Fit — Lei (TLUSTY)

T_eff [K]	39780 ± 480
log g	5.290 ± 0.050
log n(He)/n(H)	-2.750 ± 0.140
grids	Lei et al. 2020, ApJ 889, 117 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

cosmic rays	3 pixels cancelled
source file	spec-58399-GACII355N46M1_sp01-017.fits.gz

Gaia astrometry

Gaia DR3 source	1925782766239946624
parallax [mas]	0.3200 ± 0.0453
G	16.125
G_abs	3.690
μ_α [mas/yr]	2.875
μ_δ [mas/yr]	-8.385
l, b	110.051, -17.234

Published (Culpan et al. 2022)

class (Culpan)	sdOB
class (SIMBAD)	sdB
T_eff [K]	38128 ± 1084
log g	5.46 ± 0.14
log y	-3.00 ± 0.20
reference	2017OAst...26..164G

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	1.88	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	1.68	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	1.59	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	1.54	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	1.50	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	1.48	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	1.47	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	1.46	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	1.81	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	2.09	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	1.76	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	1.63	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	1.73	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	1.56	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	1.90	-15.0, 15.0	5.1	-15.0, 15.0