J18220+1044

LAMOSTJ182203.21+104420.4  ·  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]27754 ± 599
log g5.301 ± 0.088
log n(He)/n(H)-1.581 ± 0.103
reduced χ²1.004 over 637 points
radial velocity-81.0 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 18:32:56

Fit — Lei (TLUSTY)

Teff [K]28940 ± 390
log g5.050 ± 0.070
log n(He)/n(H)-1.440 ± 0.070
gridsLei et al. 2020, ApJ 889, 117
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

cosmic rays3 pixels cancelled
source filespec-58643-GACII277N10M1_sp14-189.fits.gz

Gaia astrometry

Gaia DR3 source4483659679067140992
parallax [mas]0.0239 ± 0.1016
G17.341
μα [mas/yr]-2.151
μδ [mas/yr]-3.741
l, b39.289, 11.348

Published (Culpan et al. 2022)

class (Culpan)sdB
Teff [K]31497 ± 318
log g5.38 ± 0.06
log y-1.46 ± 0.03
reference2021ApJS..256...28L

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-1.31-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-1.17-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-1.11-40.0, 31.64.2-43.0, 43.0
Hε3970.07-1.07-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-1.05-20.0, 26.24.0-31.8, 32.0
Hη3835.38-1.04-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-1.03-16.0, 16.03.9-15.6, 16.7
Hι3770.63-1.02-13.0, 13.03.9-11.7, 11.6
He II 46864685.70-1.27-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-1.21-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-1.09-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-1.33-15.0, 15.05.1-15.0, 15.0