J22559+3343

FBS2253+335  ·  Culpan knownhsd

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

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]27938 ± 577
log g5.512 ± 0.092
log n(He)/n(H)-2.772 ± 0.204
reduced χ²0.990 over 639 points
radial velocity-23.0 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 18:34:06

Fit — Lei (TLUSTY)

Teff [K]28650 ± 270
log g5.640 ± 0.070
log n(He)/n(H)-2.860 ± 0.170
gridsLei et al. 2018, ApJ 868, 70
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

source filespec-57310-HD230233N314653V01_sp16-040.fits.gz

Gaia astrometry

Gaia DR3 source1891098500140100352
parallax [mas]2.0683 ± 0.0383
G12.749
Gabs4.362
μα [mas/yr]11.477
μδ [mas/yr]-1.491
l, b97.011, -23.275

Published (Culpan et al. 2022)

class (Culpan)sdB
class (SIMBAD)sdB
Teff [K]30176 ± 194
log g5.79 ± 0.05
log y-2.73 ± 0.07
reference2021ApJS..256...28L

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-0.37-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-0.33-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-0.31-40.0, 31.64.2-43.0, 43.0
Hε3970.07-0.30-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-0.30-20.0, 26.24.0-31.8, 32.0
Hη3835.38-0.29-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-0.29-16.0, 16.03.9-15.6, 16.7
Hι3770.63-0.29-13.0, 13.03.9-11.7, 11.6
He II 46864685.70-0.36-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-0.34-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-0.31-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-0.38-15.0, 15.05.1-15.0, 15.0