J22059+0557

SDSSJ220555.60+055735.8 · Culpan knownhsd

outside the grid χ²/N = 0.97

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]	60750 ± 2165
log g	7.261 ± 0.152
log n(He)/n(H)	-3.365 ± 0.124
reduced χ²	0.968 over 733 points
radial velocity	-438.0 km s⁻¹
resolution (FWHM)	2.50 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 18:33:46

Fit — Lei (TLUSTY)

T_eff [K]	73690 ± 4430
log g	6.150 ± 0.110
log n(He)/n(H)	-1.800 ± 0.280
grids	Lei et al. 2019, ApJ 881, 135 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

source file

spec-57279-EG220007N064302M01_sp06-228.fits.gz

Gaia astrometry

Gaia DR3 source	2720511213901083264
parallax [mas]	0.1507 ± 0.1447
G	18.083
μ_α [mas/yr]	-4.003
μ_δ [mas/yr]	-6.327
l, b	66.284, -38.087

Published (Culpan et al. 2022)

class (Culpan)	sdO
class (SIMBAD)	sdO
T_eff [K]	59260 ± 6000
log g	6.15 ± 0.20
log y	-1.94 ± 0.40
reference	2009PhDT.......273H

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-7.10	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-6.34	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-5.99	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-5.80	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-5.68	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-5.60	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-5.55	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-5.51	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-6.85	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	-7.91	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	-6.64	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	-6.14	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	-6.53	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-5.88	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-7.19	-15.0, 15.0	5.1	-15.0, 15.0