J12428+1336sdB

SDSSJ124248.89+133632.6 · 12:42:48.91 13:36:32.62 · Culpan knownhsd

χ²/N = 0.98

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]	38578 ± 1100
log g	5.159 ± 0.110
log n(He)/n(H)	-3.150 ± 0.377
reduced χ²	0.982 over 640 points
radial velocity	70.0 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 18:30:43

Fit — Lei (TLUSTY)

T_eff [K]	34320 ± 510
log g	5.050 ± 0.080
log n(He)/n(H)	-3.150 ± 0.790
grids	Lei et al. 2019, ApJ 881, 135 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

S/N (classifier)	36.3
source file	spec-57458-HD124814N133310M01_sp03-053.fits.gz

Gaia astrometry

Gaia DR3 source	3929230528435328640
parallax [mas]	0.1500 ± 0.1176
G	17.559
μ_α [mas/yr]	-7.372
μ_δ [mas/yr]	-8.569
l, b	294.032, 76.332

Published (Culpan et al. 2022)

class (Culpan)	sdOB
class (SIMBAD)	sdB
T_eff [K]	36300 ± 600
log g	5.41 ± 0.10
log y	-3.00 ± 0.00
reference	Geierprep

Classifier

DISPUTED

fitted Teff 36300 logg 5.41 logY -3.0 Geierprep

auto: contrast 0.08, within the 0.19 a subdwarf reaches at 36 kK, Mg I b suggests a companion but Ca II does not (0.9 sigma)

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	1.14	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	1.01	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	0.96	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	0.93	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	0.91	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	0.90	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	0.89	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	0.88	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	1.09	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	1.04	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	0.94	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	1.15	-15.0, 15.0	5.1	-15.0, 15.0