J22226+0051sdO

PG2220+006 · 22:22:38.69 00:51:25.02 · Culpan knownhsd

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]	49196 ± 780
log g	5.792 ± 0.050
log n(He)/n(H)	-3.191 ± 0.095
reduced χ²	0.975 over 745 points
radial velocity	13.0 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
fitted	04/09/2026 19:10:52

Observation

telescope	SDSS 2.5-M
survey / programme	boss
date	2010-09-04
exposure	4504 s in 10
pipeline	v5_13_2
S/N (classifier)	60.3
source file	spec-4201-55443-0910.fits

Gaia astrometry

Gaia DR3 source	2679230771390593024
parallax [mas]	0.3135 ± 0.0611
G	16.287
G_abs	3.794
μ_α [mas/yr]	1.191
μ_δ [mas/yr]	-6.342
l, b	64.846, -44.589

Published (Culpan et al. 2022)

class (Culpan)	sdO
class (SIMBAD)	sdO
T_eff [K]	52261 ± 5000
log g	5.32 ± 0.20
log y	-2.84 ± 0.40
reference	2009PhDT.......273H

Classifier

AGREES

fitted Teff 52261 logg 5.32 logY -2.84 2009PhDT.......273H

auto: He II/He I 2.1, EW 0.32, Mg I b suggests a companion but Ca II does not (-0.7 sigma)

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	0.21	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	0.19	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	0.18	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	0.17	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	0.17	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	0.17	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	0.16	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	0.16	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	0.20	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	0.23	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	0.20	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	0.18	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	0.19	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	0.17	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	0.21	-15.0, 15.0	5.1	-15.0, 15.0

Spectral energy distribution

T_eff 49196 K · log g 5.792 · E(44−55) 0.088 · χ²_r 0.13 over 34 bands

distance 3190 pc · parallax 0.3100 ± 0.0600 mas (19%) · R 0.1706 +0.0416 −0.0277 R☉ · M 0.659 +0.377 −0.207 M☉ · L 153.7 +84.1 −46.2 L☉

Photometry against the model, with the residual beneath it in units of the error. The horizontal bar on each point is the passband, not an error; a hollow point was not fitted and the tooltip says why. Drag a box to zoom, double-click or Esc to come back out.