J18193+1810

LAMOSTJ181920.24+181042.4  ·  Culpan knownhsd

χ²/N = 0.97

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]26874 ± 659
log g5.465 ± 0.107
log n(He)/n(H)-2.954 ± 0.323
reduced χ²0.967 over 655 points
radial velocity-194.0 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 18:32:54

Fit — Lei (TLUSTY)

Teff [K]27630 ± 220
log g5.140 ± 0.030
log n(He)/n(H)-2.950 ± 0.210
gridsLei et al. 2020, ApJ 889, 117
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

cosmic rays10 pixels cancelled
source filespec-58997-GACII277N17M1_sp14-044.fits.gz

Gaia astrometry

Gaia DR3 source4523666131196149632
parallax [mas]0.3878 ± 0.0525
G16.413
Gabs4.426
μα [mas/yr]-3.354
μδ [mas/yr]-11.427
l, b45.931, 15.088

Published (Culpan et al. 2022)

class (Culpan)sdB
Teff [K]30606 ± 276
log g5.62 ± 0.06
log y-3.02 ± 0.12
reference2021ApJS..256...28L

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-3.15-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-2.81-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-2.65-40.0, 31.64.2-43.0, 43.0
Hε3970.07-2.57-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-2.52-20.0, 26.24.0-31.8, 32.0
Hη3835.38-2.48-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-2.46-16.0, 16.03.9-15.6, 16.7
Hι3770.63-2.44-13.0, 13.03.9-11.7, 11.6
Hκ3750.15-2.43-10.0, 10.03.9-7.4, 8.7
He II 46864685.70-3.03-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-2.89-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-2.61-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-3.19-15.0, 15.05.1-15.0, 15.0