J08268+5428sdO

PG0823+546 · 08:26:49.61 54:28:00.34 · Culpan knownhsd

outside the grid χ²/N = 0.95

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]	58521 ± 464
log g	6.188 ± 0.086
log n(He)/n(H)	0.175 ± 0.082
reduced χ²	0.949 over 744 points
radial velocity	88.0 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
settled	outside the grid
fitted	04/09/2026 19:07:54

Observation

telescope	SDSS 2.5-M
survey / programme	OPEN_FIBER / open_fiber
field · MJD	102914 · 59974
date	2023-01-30
catalogid	27021597917644912
exposure	900 s in 1
airmass	1.08
seeing (50%)	1.58″
E(B−V)	0.043
pipeline	v6_2_1
S/N (classifier)	31.3
source file	spec-102914-59974-27021597917644912.fits

Gaia astrometry

Gaia DR3 source	1032088994940884224
parallax [mas]	0.7901 ± 0.0398
G	14.190
BP − RP	-0.443
G_abs	3.721
μ_α [mas/yr]	32.145
μ_δ [mas/yr]	-25.212
l, b	163.673, 35.464

Published (Culpan et al. 2022)

class (Culpan)	He-sdO
class (SIMBAD)	sdOC

Classifier

DISPUTED

auto: He II/He I 13.4, EW 2.01, Mg I b suggests a companion but Ca II does not (-0.3 sigma)

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	1.43	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	1.27	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	1.20	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	1.17	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	1.14	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	1.13	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	1.11	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	1.11	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	1.38	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	1.59	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	1.33	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	1.23	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	1.31	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	1.18	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	1.44	-15.0, 15.0	5.1	-15.0, 15.0