J09103+5930sdO

PG0906+597 · 09:10:21.46 59:30:33.88 · 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]	60313 ± 607
log g	7.224 ± 0.068
log n(He)/n(H)	-1.873 ± 0.132
reduced χ²	1.001 over 745 points
radial velocity	-60.0 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 19:08:05

Observation

telescope	SDSS 2.5-M
survey / programme	MWM / mwm_cb
field · MJD	102933 · 59923
date	2022-12-10
catalogid	27021597914572564
exposure	900 s in 1
airmass	1.12
seeing (50%)	1.12″
E(B−V)	0.043
pipeline	v6_2_1
cosmic rays	4 pixels cancelled
S/N (classifier)	29.6
source file	spec-102933-59923-27021597914572564.fits

Gaia astrometry

Gaia DR3 source	1039246845702047360
parallax [mas]	1.3210 ± 0.0490
G	15.327
BP − RP	-0.611
G_abs	5.940
μ_α [mas/yr]	15.096
μ_δ [mas/yr]	-3.712
l, b	156.220, 40.556

Published (Culpan et al. 2022)

class (Culpan)	sdO
class (SIMBAD)	sdO2VIIIHe1
T_eff [K]	69329 ± 2422
log g	6.50 ± 0.11
log y	-0.35 ± 0.07
reference	2021ApJS..256...28L

Classifier

AGREES

fitted Teff 69329 logg 6.5 logY -0.35 2021ApJS..256...28L

auto: He II/He I 6.4, EW 0.95, Mg I b suggests a companion but Ca II does not (-0.5 sigma)

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-0.97	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-0.87	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-0.82	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-0.79	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-0.78	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-0.77	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-0.76	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-0.75	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-0.94	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	-1.08	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	-0.91	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	-0.84	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	-0.89	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-0.81	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-0.99	-15.0, 15.0	5.1	-15.0, 15.0