J15403+2648

PG1538+269  ·  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

profile fit on the Bamberg grid
Observed spectrum in black, model in red, offset by line. Balmer series left, helium right.

Results and provenance

Fit — Bamberg

Teff [K]25078 ± 243
log g5.397 ± 0.035
log n(He)/n(H)-3.246 ± 0.145
reduced χ²0.977 over 656 points
radial velocity-85.0 km s−1
resolution (FWHM)2.50 Å
lines fitted13
gridsHE-0.041.fits
HE-0.125.fits
HE-0.300.fits
HE-0.550.fits
+9 more
fitted04/09/2026 18:31:48

Fit — Lei (TLUSTY)

Teff [K]26220 ± 120
log g5.410 ± 0.040
log n(He)/n(H)-3.230 ± 0.100
gridsLei et al. 2018, ApJ 868, 70
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

source filespec-57085-HD153816N243118V01_sp11-040.fits.gz

Gaia astrometry

Gaia DR3 source1223920926079402112
parallax [mas]1.2092 ± 0.0297
G13.797
Gabs4.239
μα [mas/yr]9.530
μδ [mas/yr]-7.306
l, b42.403, 52.536

Published (Culpan et al. 2022)

class (Culpan)sdB+WD
class (SIMBAD)sdB
Teff [K]26841 ± 352
log g5.49 ± 0.04
log y-3.33 ± 0.07
reference2021ApJS..256...28L

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-1.38-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-1.23-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-1.16-40.0, 31.64.2-43.0, 43.0
Hε3970.07-1.13-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-1.10-20.0, 26.24.0-31.8, 32.0
Hη3835.38-1.09-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-1.08-16.0, 16.03.9-15.6, 16.7
Hι3770.63-1.07-13.0, 13.03.9-11.7, 11.6
Hκ3750.15-1.06-10.0, 10.03.9-7.4, 8.7
He II 46864685.70-1.33-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-1.27-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-1.14-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-1.40-15.0, 15.05.1-15.0, 15.0