J15030+0524sdO

SDSSJ150304.30+052436.6 · 15:03:04.30 05:24:36.65 · Culpan knownhsd

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]	57060 ± 2379
log g	6.271 ± 0.189
log n(He)/n(H)	-1.078 ± 0.176
reduced χ²	0.991 over 745 points
radial velocity	-262.0 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 19:09:20

Observation

telescope	SDSS 2.5-M
survey / programme	boss
date	2011-05-31
exposure	3603 s in 8
pipeline	v5_13_2
S/N (classifier)	21.0
source file	spec-4856-55712-0362.fits

Gaia astrometry

Gaia DR3 source	1156815699914792192
parallax [mas]	-0.2796 ± 0.2089
G	18.744
μ_α [mas/yr]	-2.190
μ_δ [mas/yr]	-0.936
l, b	4.144, 51.892

Published (Culpan et al. 2022)

class (Culpan)	sdO
class (SIMBAD)	sdO

Classifier

AGREES

auto: He II/He I 10.3, EW 1.54, red end too noisy for Ca II (S/N 8) -- a companion is neither seen nor excluded

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-4.25	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-3.79	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-3.58	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-3.47	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-3.40	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-3.35	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-3.32	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-3.30	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-4.10	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	-4.73	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	-3.97	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	-3.67	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	-3.91	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-3.52	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-4.30	-15.0, 15.0	5.1	-15.0, 15.0