J16345+2621sdO

SDSSJ163435.32+262101.7 · 16:34:35.33 26:21:01.80 · 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]	56583 ± 2318
log g	5.826 ± 0.120
log n(He)/n(H)	-2.206 ± 0.165
reduced χ²	0.997 over 742 points
radial velocity	-83.0 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 18:32:10

Fit — Lei (TLUSTY)

T_eff [K]	51420 ± 1060
log g	5.700 ± 0.110
log n(He)/n(H)	-2.310 ± 0.110
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)	47.1
source file	spec-57871-HD163226N274234M02_sp08-204.fits.gz

Gaia astrometry

Gaia DR3 source	1304379201270414592
parallax [mas]	0.3098 ± 0.0532
G	16.940
G_abs	4.370
μ_α [mas/yr]	-6.451
μ_δ [mas/yr]	-14.939
l, b	45.506, 40.602

Published (Culpan et al. 2022)

class (Culpan)	sdO
class (SIMBAD)	DAO/sdO
T_eff [K]	43490 ± 2624
log g	5.79 ± 0.17
log y	-1.77 ± 0.52
reference	2019MNRAS.486.2169K

Classifier

AGREES

fitted Teff 43490 logg 5.79 logY -1.77 2019MNRAS.486.2169K

auto: He II/He I 4.8, EW 0.72, possible composite (4.2 sigma) -- worth an SED

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-1.35	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-1.20	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-1.14	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-1.10	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-1.08	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-1.06	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-1.05	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-1.04	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-1.30	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	-1.50	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	-1.26	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	-1.16	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	-1.24	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-1.11	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-1.36	-15.0, 15.0	5.1	-15.0, 15.0