J01028+0004sdO

SDSSJ010251.88+000435.8 · 01:02:51.89 00:04:35.87 · 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]	36852 ± 1285
log g	5.157 ± 0.124
log n(He)/n(H)	-2.542 ± 0.416
reduced χ²	0.994 over 745 points
radial velocity	87.0 km s⁻¹
resolution (FWHM)	2.00 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 19:07:17

Observation

telescope	SDSS 2.5-M
survey / programme	boss
date	2010-09-16
exposure	5405 s in 12
pipeline	v5_13_2
S/N (classifier)	29.0
source file	spec-4225-55455-0856.fits

Gaia astrometry

Gaia DR3 source	2536325557206313728
parallax [mas]	-0.1240 ± 0.1937
G	18.381
μ_α [mas/yr]	-0.684
μ_δ [mas/yr]	-2.463
l, b	129.161, -62.657

Published (Culpan et al. 2022)

class (Culpan)	sdO
class (SIMBAD)	sdB
T_eff [K]	36772 ± 2000
log g	4.82 ± 0.20
log y	-0.93 ± 0.40
reference	2009PhDT.......273H

Classifier

AGREES

fitted Teff 36772 logg 4.82 logY -0.93 2009PhDT.......273H

auto: He II/He I 7.0, EW 1.10, Mg I b suggests a companion but Ca II does not (0.5 sigma); contrast 0.09 over the 0.06 expected at 51 kK

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	1.41	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	1.26	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	1.19	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	1.15	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	1.13	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	1.11	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	1.10	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	1.09	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	1.36	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	1.57	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	1.32	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	1.22	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	1.30	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	1.17	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	1.43	-15.0, 15.0	5.1	-15.0, 15.0