J14580+0439sdO

SDSSJ145803.55+043922.0 · 14:58:03.55 04:39:21.92 · Culpan knownhsd

outside the grid χ²/N = 0.96

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]	56864 ± 2269
log g	4.762 ± 0.187
log n(He)/n(H)	0.210 ± 0.144
reduced χ²	0.964 over 745 points
radial velocity	42.0 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 19:09:19

Observation

telescope	SDSS 2.5-M
survey / programme	boss
date	2011-05-26
exposure	4504 s in 10
pipeline	v5_13_2
S/N (classifier)	32.3
source file	spec-4777-55707-0652.fits

Gaia astrometry

Gaia DR3 source	1158169989002659200
parallax [mas]	0.0252 ± 0.1917
G	18.242
μ_α [mas/yr]	-0.607
μ_δ [mas/yr]	-0.228
l, b	1.906, 52.381

Published (Culpan et al. 2022)

class (Culpan)	He-sdO
class (SIMBAD)	sdO
T_eff [K]	51497 ± 1301
log g	4.82 ± 0.16
log y	0.65 ± 0.20
reference	2021ApJS..256...28L

Classifier

DISPUTED

fitted Teff 51497 logg 4.82 logY 0.65 2021ApJS..256...28L

auto: He II/He I 6.4, EW 0.97, Ca II 8662/8542 = 19.2 -- the star's own Paschen lines, not a companion

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	0.68	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	0.61	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	0.57	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	0.56	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	0.54	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	0.54	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	0.53	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	0.53	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	0.66	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	0.76	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	0.64	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	0.59	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	0.63	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	0.56	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	0.69	-15.0, 15.0	5.1	-15.0, 15.0