J15261+0016

SDSSJ152607.88+001640.7 · Culpan knownhsd

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]	52880 ± 805
log g	5.814 ± 0.063
log n(He)/n(H)	-0.686 ± 0.051
reduced χ²	0.975 over 745 points
radial velocity	-130.0 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 19:09:23

Observation

source file

spec-4012-55327-0892.fits

Gaia astrometry

Gaia DR3 source	4417304530279961088
parallax [mas]	0.1903 ± 0.0682
G	16.819
μ_α [mas/yr]	-8.670
μ_δ [mas/yr]	-9.524
l, b	3.561, 44.190

Published (Culpan et al. 2022)

class (Culpan)	sdO
class (SIMBAD)	sdO
T_eff [K]	62093 ± 6000
log g	5.51 ± 0.20
log y	-0.45 ± 0.40
reference	2009PhDT.......273H

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-2.11	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-1.88	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-1.78	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-1.72	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-1.69	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-1.66	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-1.65	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-1.64	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-2.03	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	-2.35	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	-1.97	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	-1.82	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	-1.94	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-1.75	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-2.13	-15.0, 15.0	5.1	-15.0, 15.0

Spectral energy distribution

T_eff 52880 K · log g 5.814 · E(44−55) 0.046 · χ²_r 0.20 over 31 bands

distance 5255 pc · parallax 0.1900 ± 0.0700 mas (37%) · R 0.2004 +0.1113 −0.0526 R☉ · M 0.957 +1.381 −0.443 M☉ — above the 0.47 canonical mass · L 283.2 +401.2 −129.4 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.