J20535-0136sdO

20:53:30.53 -01:36:53.75 · Culpan hotsd

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]	47239 ± 1094
log g	5.888 ± 0.089
log n(He)/n(H)	-2.895 ± 0.244
reduced χ²	0.976 over 746 points
radial velocity	-104.0 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
fitted	04/09/2026 19:10:36

Observation

telescope	SDSS 2.5-M
survey / programme	MWM / mwm_cb
field · MJD	101059 · 59797
date	2022-08-06
catalogid	27021598726365831
exposure	1800 s in 2
airmass	1.21
seeing (50%)	1.93″
E(B−V)	0.119
pipeline	v6_2_1
S/N (classifier)	34.8
source file	spec-101059-59797-27021598726365831.fits

Gaia astrometry

Gaia DR3 source	6916925361398340096
parallax [mas]	0.5458 ± 0.0478
G	15.866
BP − RP	-0.344
G_abs	4.551
μ_α [mas/yr]	-0.112
μ_δ [mas/yr]	-5.650
RUWE	0.982
l, b	46.409, -27.685
selection	f_plx

Classifier

NEW

auto: He II/He I 2.6, EW 0.39, Mg I b suggests a companion but Ca II does not (-0.1 sigma)

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-1.69	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-1.51	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-1.42	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-1.38	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-1.35	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-1.33	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-1.32	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-1.31	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-1.63	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	-1.88	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	-1.58	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	-1.46	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	-1.55	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-1.40	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-1.71	-15.0, 15.0	5.1	-15.0, 15.0

Spectral energy distribution

T_eff 47239 K · log g 5.888 · E(44−55) 0.112 · χ²_r 0.13 over 37 bands

distance 1832 pc · parallax 0.5500 ± 0.0500 mas (9%) · R 0.1264 +0.0123 −0.0103 R☉ · M 0.451 +0.111 −0.084 M☉ · L 71.7 +14.6 −11.3 L☉

Photometry against the model, with the residual beneath it in units of the error. The horizontal bar on each point is the passband, not an error; a hollow point was not fitted and the tooltip says why. Drag a box to zoom, double-click or Esc to come back out.