J15561+2546sdO:

SDSSJ155610.40+254640.3 · 15:56:10.42 25:46:40.26 · Culpan hotsd

outside the grid 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]	58710 ± 750
log g	5.661 ± 0.209
log n(He)/n(H)	0.619 ± 0.209
reduced χ²	0.988 over 748 points
radial velocity	32.0 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 19:09:32

Observation

telescope	SDSS 2.5-M
survey / programme	boss
date	2010-05-11
exposure	4504 s in 10
pipeline	v5_13_2
S/N (classifier)	36.7
source file	spec-3940-55327-0570.fits

Gaia astrometry

Gaia DR3 source	1220049614357436544
parallax [mas]	0.0859 ± 0.0983
G	17.909
BP − RP	-0.425
μ_α [mas/yr]	-5.609
μ_δ [mas/yr]	-1.309
RUWE	0.981
l, b	41.919, 48.865
selection	f_pm

Published (Culpan et al. 2022)

class (Culpan)

PG1159

Classifier

DISPUTED

fitted Teff 100000 logg 5.3 logY - 2016A&A...587A.101R

auto: He II/He I 10.5, EW 1.57, C 4650 1.38 (7 sigma), Mg I b suggests a companion but Ca II does not (-0.3 sigma); contrast 0.03 over the 0.02 expected at 82 kK

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	0.52	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	0.46	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	0.44	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	0.42	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	0.42	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	0.41	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	0.41	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	0.40	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	0.50	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	0.58	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	0.48	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	0.45	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	0.48	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	0.43	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	0.53	-15.0, 15.0	5.1	-15.0, 15.0