J18121+1755

LAMOSTJ181211.25+175540.6  ·  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]23564 ± 548
log g5.024 ± 0.072
log n(He)/n(H)-2.347 ± 0.118
reduced χ²0.998 over 659 points
radial velocity15.0 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 18:32:51

Fit — Lei (TLUSTY)

Teff [K]23640 ± 420
log g5.030 ± 0.070
log n(He)/n(H)-2.300 ± 0.150
gridsLei et al. 2020, ApJ 889, 117
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

cosmic rays14 pixels cancelled
source filespec-58634-GACII273N16B1_sp11-078.fits.gz

Gaia astrometry

Gaia DR3 source4526236102186660352
parallax [mas]0.1450 ± 0.0747
G17.372
μα [mas/yr]-6.083
μδ [mas/yr]-8.800
l, b44.975, 16.539

Published (Culpan et al. 2022)

class (Culpan)sdB
Teff [K]25500 ± 604
log g5.21 ± 0.06
log y-2.32 ± 0.05
reference2021ApJS..256...28L

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.320.24-40.0, 40.05.0-45.0, 45.0
Hγ4340.460.22-40.0, 36.84.5-43.0, 43.0
Hδ4101.730.21-40.0, 31.64.2-43.0, 43.0
Hε3970.070.20-28.0, 30.04.1-30.0, 35.0
Hζ3889.050.19-20.0, 26.24.0-31.8, 32.0
Hη3835.380.19-20.0, 14.64.0-20.7, 21.8
Hθ3797.900.19-16.0, 16.03.9-15.6, 16.7
Hι3770.630.19-13.0, 13.03.9-11.7, 11.6
Hκ3750.150.19-10.0, 10.03.9-7.4, 8.7
He II 46864685.700.23-11.9, 11.94.9-15.0, 13.8
He I 44724471.600.22-15.0, 15.04.6-15.0, 15.0
He I 40264026.290.20-24.2, 15.04.2-15.0, 15.0
He I 49224921.930.25-15.0, 15.05.1-15.0, 15.0