J00239+4209

FBS0021+418  ·  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]29682 ± 513
log g5.442 ± 0.071
log n(He)/n(H)-2.472 ± 0.159
reduced χ²1.002 over 639 points
radial velocity42.0 km s−1
resolution (FWHM)2.50 Å
lines fitted12
gridsHE-0.041.fits
HE-0.125.fits
HE-0.300.fits
HE-0.550.fits
+9 more
fitted04/09/2026 18:25:05

Fit — Lei (TLUSTY)

Teff [K]30320 ± 220
log g5.550 ± 0.060
log n(He)/n(H)-2.410 ± 0.090
gridsLei et al. 2019, ApJ 881, 135
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

cosmic rays3 pixels cancelled
source filespec-56266-M31007N41B1_sp03-101.fits.gz

Gaia astrometry

Gaia DR3 source382086995098288896
parallax [mas]0.3875 ± 0.0475
G15.772
Gabs3.780
μα [mas/yr]6.771
μδ [mas/yr]9.176
l, b117.494, -20.430

Published (Culpan et al. 2022)

class (Culpan)sdB
class (SIMBAD)sdB
Teff [K]29032 ± 477
log g5.12 ± 0.06
log y-2.76 ± 0.07
reference2021ApJS..256...28L

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.320.68-40.0, 40.05.0-45.0, 45.0
Hγ4340.460.61-40.0, 36.84.5-43.0, 43.0
Hδ4101.730.57-40.0, 31.64.2-43.0, 43.0
Hε3970.070.56-28.0, 30.04.1-30.0, 35.0
Hζ3889.050.54-20.0, 26.24.0-31.8, 32.0
Hη3835.380.54-20.0, 14.64.0-20.7, 21.8
Hθ3797.900.53-16.0, 16.03.9-15.6, 16.7
Hι3770.630.53-13.0, 13.03.9-11.7, 11.6
He II 46864685.700.66-11.9, 11.94.9-15.0, 13.8
He I 44724471.600.63-15.0, 15.04.6-15.0, 15.0
He I 40264026.290.56-24.2, 15.04.2-15.0, 15.0
He I 49224921.930.69-15.0, 15.05.1-15.0, 15.0