J20015+4434

LAMOSTJ200134.43+443427.5  ·  Culpan knownhsd

χ²/N = 1.01

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]37974 ± 434
log g5.545 ± 0.045
log n(He)/n(H)-3.297 ± 0.473
reduced χ²1.008 over 639 points
radial velocity-69.0 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 18:33:11

Fit — Lei (TLUSTY)

Teff [K]34260 ± 1220
log g5.290 ± 0.160
log n(He)/n(H)-2.750 ± 0.000
gridsLei et al. 2018, ApJ 868, 70
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

source filespec-57284-KP195920N454621B02_sp08-177.fits.gz

Gaia astrometry

Gaia DR3 source2076135724307679872
parallax [mas]0.6079 ± 0.0265
G15.435
Gabs4.390
μα [mas/yr]-0.316
μδ [mas/yr]-6.306
l, b79.699, 7.413

Published (Culpan et al. 2022)

class (Culpan)sdOB
class (SIMBAD)sdB
Teff [K]36457 ± 198
log g5.58 ± 0.04
log y-3.07 ± 0.11
reference2021ApJS..256...28L

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-1.12-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-1.00-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-0.94-40.0, 31.64.2-43.0, 43.0
Hε3970.07-0.91-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-0.90-20.0, 26.24.0-31.8, 32.0
Hη3835.38-0.88-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-0.87-16.0, 16.03.9-15.6, 16.7
Hι3770.63-0.87-13.0, 13.03.9-11.7, 11.6
He II 46864685.70-1.08-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-1.03-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-0.93-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-1.13-15.0, 15.05.1-15.0, 15.0