J16160+1012sdO

SDSSJ161603.28+101210.6 · 16:16:03.29 10:12:10.58 · Culpan knownhsd

outside the grid χ²/N = 1.02

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]	56851 ± 1090
log g	6.083 ± 0.089
log n(He)/n(H)	-0.653 ± 0.075
reduced χ²	1.018 over 748 points
radial velocity	-2.0 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 19:09:39

Observation

telescope	SDSS 2.5-M
survey / programme	boss
date	2012-04-23
exposure	4504 s in 10
pipeline	v5_13_2
S/N (classifier)	37.1
source file	spec-5205-56040-0830.fits

Gaia astrometry

Gaia DR3 source	4453590853539680896
parallax [mas]	0.1567 ± 0.1081
G	17.850
μ_α [mas/yr]	0.334
μ_δ [mas/yr]	-0.187
l, b	23.755, 39.062

Published (Culpan et al. 2022)

class (Culpan)	He-sdO
class (SIMBAD)	sdOHe

Classifier

DISPUTED

auto: He II/He I 12.0, EW 1.80, Mg I b suggests a companion but Ca II does not (-1.0 sigma); contrast 0.04 over the 0.02 expected at 78 kK

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-0.03	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-0.03	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-0.03	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-0.03	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-0.03	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-0.03	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-0.03	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-0.03	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-0.03	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	-0.04	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	-0.03	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	-0.03	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	-0.03	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-0.03	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-0.03	-15.0, 15.0	5.1	-15.0, 15.0