J09056+1212

PG0902+124  ·  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]27153 ± 177
log g5.540 ± 0.029
log n(He)/n(H)-2.674 ± 0.081
reduced χ²0.978 over 659 points
radial velocity-105.0 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 18:29:32

Fit — Lei (TLUSTY)

Teff [K]28570 ± 110
log g5.470 ± 0.030
log n(He)/n(H)-2.620 ± 0.070
gridsLei et al. 2018, ApJ 868, 70
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

cosmic rays4 pixels cancelled
source filespec-57790-HD090744N104005B01_sp16-109.fits.gz

Gaia astrometry

Gaia DR3 source604474251290699776
parallax [mas]0.8616 ± 0.0392
G14.598
Gabs4.338
μα [mas/yr]7.590
μδ [mas/yr]1.572
l, b217.018, 35.261

Published (Culpan et al. 2022)

class (Culpan)sdB
class (SIMBAD)sdB
Teff [K]28050 ± 840
log g5.50 ± 0.15
log y-2.79 ± 0.76
reference2012MNRAS.427.2180N

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-1.70-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-1.52-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-1.44-40.0, 31.64.2-43.0, 43.0
Hε3970.07-1.39-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-1.36-20.0, 26.24.0-31.8, 32.0
Hη3835.38-1.34-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-1.33-16.0, 16.03.9-15.6, 16.7
Hι3770.63-1.32-13.0, 13.03.9-11.7, 11.6
Hκ3750.15-1.31-10.0, 10.03.9-7.4, 8.7
He II 46864685.70-1.64-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-1.57-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-1.41-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-1.72-15.0, 15.05.1-15.0, 15.0