J14430+5144

SDSSJ144301.69+514410.3 · 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.

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]	20853 ± 212
log g	4.782 ± 0.027
log n(He)/n(H)	-2.017 ± 0.064
reduced χ²	0.985 over 659 points
radial velocity	81.0 km s⁻¹
resolution (FWHM)	2.00 Å
lines fitted	13
grids	HE-0.041.fits HE-0.125.fits HE-0.300.fits HE-0.550.fits +9 more
fitted	04/09/2026 19:09:13

Fit — uli

T_eff [K]	20756 ± 179
log g	4.689 ± 0.026
log n(He)/n(H)	-1.919 ± 0.079
reduced χ²	0.974 over 659 points
radial velocity	81.0 km s⁻¹
resolution (FWHM)	2.00 Å
lines fitted	13
grids	h909.grid h97.grid h99.grid h999.grid
settled	outside the grid
fitted	04/09/2026 18:36:05

Observation

source file

spec-6725-56390-0788.fits

Gaia astrometry

Gaia DR3 source	1604107479750791552
parallax [mas]	0.2213 ± 0.0379
G	16.095
G_abs	2.874
μ_α [mas/yr]	-8.175
μ_δ [mas/yr]	-12.955
l, b	90.109, 57.686

Published (Culpan et al. 2022)

class (Culpan)	sdB
class (SIMBAD)	DA
T_eff [K]	21148 ± 893
log g	4.78 ± 0.11
log y	-2.00 ± 0.22
reference	2019MNRAS.486.2169K

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	1.31	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	1.17	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	1.11	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	1.07	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	1.05	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	1.04	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	1.03	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	1.02	-13.0, 13.0	3.9	-11.7, 11.6
H_κ	3750.15	1.01	-10.0, 10.0	3.9	-7.4, 8.7
He II 4686	4685.70	1.27	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	1.21	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	1.09	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	1.33	-15.0, 15.0	5.1	-15.0, 15.0

Spectral energy distribution

T_eff 20853 K · log g 4.782 · E(44−55) 0.072 · χ²_r 0.14 over 37 bands

distance 4519 pc · parallax 0.2200 ± 0.0400 mas (18%) · R 0.5264 +0.1096 −0.0767 R☉ · M 0.614 +0.297 −0.177 M☉ · L 47.3 +21.8 −12.9 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.