J02155+4925

LAMOSTJ021534.78+492537.7  ·  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]38867 ± 600
log g5.998 ± 0.093
log n(He)/n(H)-1.477 ± 0.087
reduced χ²1.004 over 639 points
radial velocity-52.0 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 18:25:50

Fit — Lei (TLUSTY)

Teff [K]37420 ± 470
log g5.910 ± 0.040
log n(He)/n(H)-1.470 ± 0.090
gridsLei et al. 2020, ApJ 889, 117
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

cosmic rays4 pixels cancelled
source filespec-58107-GACII033N47M1_sp11-098.fits.gz

Gaia astrometry

Gaia DR3 source355574058902192768
parallax [mas]0.4553 ± 0.0715
G16.782
Gabs5.094
μα [mas/yr]1.279
μδ [mas/yr]-0.623
l, b136.699, -11.182

Published (Culpan et al. 2022)

class (Culpan)sdOB
Teff [K]38672 ± 262
log g6.06 ± 0.04
log y-1.56 ± 0.04
reference2021ApJS..256...28L

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-0.84-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-0.75-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-0.71-40.0, 31.64.2-43.0, 43.0
Hε3970.07-0.69-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-0.67-20.0, 26.24.0-31.8, 32.0
Hη3835.38-0.67-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-0.66-16.0, 16.03.9-15.6, 16.7
Hι3770.63-0.65-13.0, 13.03.9-11.7, 11.6
He II 46864685.70-0.81-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-0.78-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-0.70-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-0.85-15.0, 15.05.1-15.0, 15.0