J12596-0039

SDSSJ125941.88-003928.7 · Culpan knownhsd

χ²/N = 0.97

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]	37115 ± 422
log g	5.691 ± 0.046
log n(He)/n(H)	-1.904 ± 0.100
reduced χ²	0.970 over 746 points
radial velocity	-105.0 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 19:08:55

Observation

source file

spec-3794-55241-0954.fits

Gaia astrometry

Gaia DR3 source	3689100350025605888
parallax [mas]	0.3275 ± 0.0932
G	16.823
μ_α [mas/yr]	-9.397
μ_δ [mas/yr]	-2.123
l, b	307.354, 62.143

Published (Culpan et al. 2022)

class (Culpan)	sdOB
class (SIMBAD)	sdO

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-1.70	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-1.52	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-1.44	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-1.39	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-1.36	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-1.34	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-1.33	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-1.32	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-1.64	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	-1.90	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	-1.59	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	-1.47	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	-1.57	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-1.41	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-1.72	-15.0, 15.0	5.1	-15.0, 15.0

Spectral energy distribution

Component 1, the subdwarf: T_eff 37115 K (held) · log g 5.691 (held) · R 0.0986 R☉ (fitted, with the companion) · χ²_r 2.65 over 36 bands

E(44−55) 0.018 (held)

Component 2, the companion: T_eff 6250 K (fitted, 3500–8750 K grid) · log g 4.50 (held) · R 0.7020 R☉ (fitted) · χ²_r 0.17 for the two components together (Δχ² 1396 over one star, same bands)

The dashed curves beneath the model are the two components of this fit: the subdwarf alone and the cool companion.

distance 3053 pc · parallax 0.3300 ± 0.0900 mas (27%) · M 1.262 +1.240 −0.507 M☉ — above the 0.47 canonical mass · (from the ONE-star scale -- not corrected for the companion's light) · L 120.6 +115.7 −47.6 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.