J22566+2945sdOB

SDSSJ225640.87+294546.70 · 22:56:40.87 29:45:46.73 · Culpan knownhsd

χ²/N = 0.98

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]	37733 ± 335
log g	5.971 ± 0.052
log n(He)/n(H)	-1.419 ± 0.043
reduced χ²	0.983 over 639 points
radial velocity	12.0 km s⁻¹
resolution (FWHM)	2.50 Å
lines fitted	12
grids	HE-0.041.fits HE-0.125.fits HE-0.300.fits HE-0.550.fits +9 more
fitted	04/09/2026 18:34:08

Fit — Lei (TLUSTY)

T_eff [K]	36060 ± 1050
log g	6.010 ± 0.070
log n(He)/n(H)	-1.480 ± 0.080
grids	Lei et al. 2020, ApJ 889, 117 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

cosmic rays	4 pixels cancelled
S/N (classifier)	62.4
source file	spec-58076-GACII346N28M1_sp14-218.fits.gz

Gaia astrometry

Gaia DR3 source	1886200725594365568
parallax [mas]	0.3347 ± 0.0601
G	16.322
G_abs	3.945
μ_α [mas/yr]	0.052
μ_δ [mas/yr]	-5.032
l, b	95.091, -26.833

Published (Culpan et al. 2022)

class (Culpan)	sdOB
class (SIMBAD)	sdO
T_eff [K]	37866 ± 190
log g	5.92 ± 0.03
log y	-1.38 ± 0.03
reference	2021ApJS..256...28L

Classifier

AGREES

fitted Teff 37866 logg 5.92 logY -1.38 2021ApJS..256...28L

auto: He II 0.28 (2.6 sigma), Mg I b suggests a companion but Ca II does not (0.8 sigma)

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	0.19	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	0.17	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	0.16	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	0.16	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	0.16	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	0.15	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	0.15	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	0.15	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	0.19	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	0.18	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	0.16	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	0.20	-15.0, 15.0	5.1	-15.0, 15.0