J21312+1129

PG2128+112  ·  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]38918 ± 336
log g5.987 ± 0.036
log n(He)/n(H)-1.651 ± 0.053
reduced χ²0.994 over 637 points
radial velocity-82.0 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 18:33:34

Fit — Lei (TLUSTY)

Teff [K]37210 ± 290
log g5.890 ± 0.020
log n(He)/n(H)-1.660 ± 0.040
gridsLei et al. 2020, ApJ 889, 117
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

source filespec-58403-GACII324N11B2_sp03-086.fits.gz

Gaia astrometry

Gaia DR3 source1745849337621677184
parallax [mas]0.6883 ± 0.0469
G15.921
Gabs5.153
μα [mas/yr]-7.340
μδ [mas/yr]-6.273
l, b64.642, -27.973

Published (Culpan et al. 2022)

class (Culpan)sdOB
class (SIMBAD)sdO
Teff [K]37868 ± 933
log g6.02 ± 0.13
log y-1.80 ± 0.20
reference2017OAst...26..164G

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
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