J20523+1232sdO

20:52:20.35 12:32:39.70 · Culpan hotsd

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]	63838 ± 529
log g	7.483 ± 0.045
log n(He)/n(H)	-2.357 ± 0.059
reduced χ²	0.983 over 747 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 19:10:35

Observation

telescope	SDSS 2.5-M
survey / programme	MWM / mwm_cb
field · MJD	101035 · 60233
date	2023-10-16
catalogid	63050394859540799
exposure	900 s in 1
airmass	1.07
seeing (50%)	1.52″
E(B−V)	0.109
pipeline	v6_2_1
cosmic rays	3 pixels cancelled
S/N (classifier)	26.9
source file	spec-101035-60233-63050394859540799.fits

Gaia astrometry

Gaia DR3 source	1758040756907717504
parallax [mas]	0.8768 ± 0.0512
G	16.060
BP − RP	-0.411
G_abs	5.775
μ_α [mas/yr]	6.328
μ_δ [mas/yr]	-11.841
RUWE	1.023
l, b	59.260, -19.773
selection	f_plx

Classifier

NEW

auto: He II/He I 7.0, EW 1.04, Mg I b suggests a companion but Ca II does not (-0.3 sigma); contrast 0.03 over the 0.02 expected at 74 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