J11282-0546sdO

PG1125-055 · 11:28:12.24 -05:46:15.20 · Culpan knownhsd

outside the grid χ²/N = 0.98

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]	57603 ± 717
log g	6.013 ± 0.119
log n(He)/n(H)	0.336 ± 0.148
reduced χ²	0.980 over 742 points
radial velocity	-390.0 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 19:08:36

Observation

telescope	LCO Du Pont
survey / programme	MWM / mwm_cb
field · MJD	026382 · 60103
date	2023-06-08
catalogid	27021598131637383
exposure	3600 s in 4
airmass	1.16
seeing (50%)	1.18″
E(B−V)	0.060
pipeline	v6_2_1
S/N (classifier)	43.6
source file	spec-026382-60103-27021598131637383.fits

Gaia astrometry

Gaia DR3 source	3785540507762764416
parallax [mas]	0.4065 ± 0.1035
G	16.787
BP − RP	-0.529
μ_α [mas/yr]	-14.250
μ_δ [mas/yr]	-13.023
l, b	268.396, 51.432

Published (Culpan et al. 2022)

class (Culpan)	He-sdO
class (SIMBAD)	sdOC
T_eff [K]	62695 ± 2720
log g	5.69 ± 0.23
log y	0.66 ± 0.26
reference	2021ApJS..256...28L

Classifier

DISPUTED

fitted Teff 62695 logg 5.69 logY 0.66 2021ApJS..256...28L

auto: He II/He I 12.1, EW 1.82, Mg I b suggests a companion but Ca II does not (-0.0 sigma)

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-6.32	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-5.65	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-5.34	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-5.16	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-5.06	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-4.99	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-4.94	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-4.91	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-6.10	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	-7.04	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	-5.91	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	-5.46	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	-5.82	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-5.24	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-6.40	-15.0, 15.0	5.1	-15.0, 15.0