J16284+3532sdO

SDSSJ162825.87+353205.1 · 16:28:25.87 35:32:05.14 · Culpan knownhsd

outside the grid χ²/N = 0.99

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]	58608 ± 1212
log g	6.060 ± 0.174
log n(He)/n(H)	-0.708 ± 0.167
reduced χ²	0.989 over 745 points
radial velocity	184.0 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 19:09:41

Observation

telescope	SDSS 2.5-M
survey / programme	boss
date	2012-05-01
exposure	2702 s in 6
pipeline	v5_13_2
S/N (classifier)	20.7
source file	spec-5195-56048-0444.fits

Gaia astrometry

Gaia DR3 source	1329306225086842112
parallax [mas]	0.0895 ± 0.1540
G	18.680
μ_α [mas/yr]	-2.877
μ_δ [mas/yr]	-6.300
l, b	57.395, 43.485

Published (Culpan et al. 2022)

class (Culpan)	sdO
class (SIMBAD)	sdO
T_eff [K]	67580 ± 7000
log g	5.36 ± 0.20
log y	-0.50 ± 0.40
reference	2009PhDT.......273H

Classifier

AGREES

fitted Teff 67580 logg 5.36 logY -0.5 2009PhDT.......273H

auto: He II/He I 8.5, EW 1.27, red end too noisy for Ca II (S/N 8) -- a companion is neither seen nor excluded

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	2.98	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	2.66	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	2.52	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	2.44	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	2.39	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	2.35	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	2.33	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	2.31	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	2.88	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	3.32	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	2.79	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	2.58	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	2.74	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	2.47	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	3.02	-15.0, 15.0	5.1	-15.0, 15.0