J21278+0029sdO

SDSSJ212749.34+002924.1 · 21:27:49.34 00:29:24.22 · Culpan knownhsd

outside the grid χ²/N = 1.00

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]	59557 ± 1103
log g	6.516 ± 0.165
log n(He)/n(H)	-1.107 ± 0.224
reduced χ²	1.001 over 745 points
radial velocity	-22.0 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 18:33:33

Fit — Lei (TLUSTY)

T_eff [K]	58450 ± 10450
log g	6.360 ± 0.100
log n(He)/n(H)	-1.800 ± 0.190
grids	Lei et al. 2019, ApJ 881, 135 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

cosmic rays	3 pixels cancelled
S/N (classifier)	38.3
source file	spec-56948-EG212551N003203M01_sp04-227.fits.gz

Gaia astrometry

Gaia DR3 source	2687977931850851584
parallax [mas]	0.3623 ± 0.1298
G	17.937
μ_α [mas/yr]	1.810
μ_δ [mas/yr]	-9.450
l, b	53.755, -33.871

Published (Culpan et al. 2022)

class (Culpan)	sdO
class (SIMBAD)	DAO/sdO
T_eff [K]	73371 ± 3025
log g	5.96 ± 0.08
log y	-0.60 ± 0.07
reference	2021ApJS..256...28L

Classifier

AGREES

fitted Teff 73371 logg 5.96 logY -0.6 2021ApJS..256...28L

auto: He II/He I 13.0, EW 1.95, red end too noisy for Ca II (S/N 14) -- a companion is neither seen nor excluded

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-0.36	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-0.32	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-0.30	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-0.29	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-0.29	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-0.28	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-0.28	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-0.28	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-0.34	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	-0.40	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	-0.33	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	-0.31	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	-0.33	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-0.30	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-0.36	-15.0, 15.0	5.1	-15.0, 15.0