J11053+4934sdO

PG1102+499 · 11:05:23.16 49:34:59.70 · 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]	57857 ± 560
log g	5.830 ± 0.067
log n(He)/n(H)	-0.905 ± 0.052
reduced χ²	0.987 over 746 points
radial velocity	-35.0 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 19:08:29

Observation

telescope	SDSS 2.5-M
survey / programme	OPEN_FIBER / open_fiber
field · MJD	103111 · 60056
date	2023-04-22
catalogid	27021597919255975
exposure	900 s in 1
airmass	1.11
seeing (50%)	1.66″
E(B−V)	0.020
pipeline	v6_2_1
cosmic rays	7 pixels cancelled
S/N (classifier)	31.0
source file	spec-103111-60056-27021597919255975.fits

Gaia astrometry

Gaia DR3 source	832788184395879424
parallax [mas]	0.5270 ± 0.0458
G	14.237
BP − RP	-0.590
G_abs	2.892
μ_α [mas/yr]	-4.061
μ_δ [mas/yr]	-5.775
l, b	157.951, 59.712

Published (Culpan et al. 2022)

class (Culpan)	He-sdO
class (SIMBAD)	sdOB
T_eff [K]	67647 ± 891
log g	5.38 ± 0.03
log y	-0.83 ± 0.02
reference	2021ApJS..256...28L

Classifier

DISPUTED

fitted Teff 67647 logg 5.38 logY -0.83 2021ApJS..256...28L

auto: He II/He I 10.7, EW 1.61, Mg I b suggests a companion but Ca II does not (-0.0 sigma); contrast 0.02 over the 0.02 expected at 73 kK

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-0.57	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-0.51	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-0.48	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-0.46	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-0.45	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-0.45	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-0.44	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-0.44	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-0.55	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	-0.63	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	-0.53	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	-0.49	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	-0.52	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-0.47	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-0.57	-15.0, 15.0	5.1	-15.0, 15.0