J00425+0047

SDSSJ004233.42+004717.6 · 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.

Line-profile fit — uli

Observed spectrum in black, model in red, offset by line. Balmer series left, helium right.

Results and provenance

Fit — Bamberg

T_eff [K]	29687 ± 247
log g	5.465 ± 0.033
log n(He)/n(H)	-6.195 ± 0.833 upper limit
reduced χ²	0.992 over 639 points
radial velocity	-121.0 km s⁻¹
resolution (FWHM)	2.00 Å
lines fitted	12
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 19:07:11

Fit — uli

T_eff [K]	30150 ± 215
log g	5.383 ± 0.034
log n(He)/n(H)	-3.391 ± 0.101 upper limit
reduced χ²	0.993 over 639 points
radial velocity	-121.0 km s⁻¹
resolution (FWHM)	2.00 Å
lines fitted	12
grids	h667.grid h909.grid h97.grid h99.grid +1 more
settled	outside the grid
fitted	04/09/2026 18:34:26

Observation

source file

spec-3588-55184-0872.fits

Gaia astrometry

Gaia DR3 source	2549323124676105472
parallax [mas]	0.0080 ± 0.1076
G	17.384
μ_α [mas/yr]	6.825
μ_δ [mas/yr]	-8.230
l, b	118.199, -62.002

Published (Culpan et al. 2022)

class (Culpan)	sdB
class (SIMBAD)	sdB

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-1.96	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-1.75	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-1.66	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-1.60	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-1.57	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-1.55	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-1.53	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-1.52	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-1.89	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	-1.80	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-1.63	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-1.99	-15.0, 15.0	5.1	-15.0, 15.0

Spectral energy distribution

T_eff 29687 K · log g 5.465 · E(44−55) 0.076 · χ²_r 0.30 over 27 bands

distance 125000 pc · parallax 0.0100 ± 0.1100 mas (1100%) · R 0.6205 +1.4218 −0.3214 R☉ · M 4.107 +40.422 −3.164 M☉ — above the 0.47 canonical mass · L 269.9 +2659.1 −207.4 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.