J00257+3135

LAMOSTJ002545.50+313529.4  ·  Culpan knownhsd

χ²/N = 1.00

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]25423 ± 233
log g5.370 ± 0.036
log n(He)/n(H)-2.237 ± 0.053
reduced χ²1.003 over 656 points
radial velocity-82.0 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 18:25:07

Fit — Lei (TLUSTY)

Teff [K]26180 ± 340
log g5.390 ± 0.030
log n(He)/n(H)-2.270 ± 0.050
gridsLei et al. 2019, ApJ 881, 135
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

cosmic rays7 pixels cancelled
source filespec-57015-M31007N33B1_sp01-234.fits.gz

Gaia astrometry

Gaia DR3 source2862287843823854848
parallax [mas]0.4923 ± 0.0447
G15.507
Gabs4.052
μα [mas/yr]0.424
μδ [mas/yr]-10.134
l, b116.555, -30.962

Published (Culpan et al. 2022)

class (Culpan)sdB
Teff [K]27087 ± 322
log g5.39 ± 0.03
log y-2.20 ± 0.03
reference2021ApJS..256...28L

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-1.33-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-1.19-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-1.12-40.0, 31.64.2-43.0, 43.0
Hε3970.07-1.09-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-1.06-20.0, 26.24.0-31.8, 32.0
Hη3835.38-1.05-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-1.04-16.0, 16.03.9-15.6, 16.7
Hι3770.63-1.03-13.0, 13.03.9-11.7, 11.6
Hκ3750.15-1.03-10.0, 10.03.9-7.4, 8.7
He II 46864685.70-1.28-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-1.22-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-1.10-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-1.35-15.0, 15.05.1-15.0, 15.0