J02020+5643

LAMOSTJ020201.84+564342.2  ·  Culpan knownhsd

χ²/N = 1.02

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]28278 ± 493
log g5.688 ± 0.084
log n(He)/n(H)-2.616 ± 0.145
reduced χ²1.017 over 639 points
radial velocity-127.0 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 18:25:43

Fit — Lei (TLUSTY)

Teff [K]28920 ± 590
log g5.620 ± 0.070
log n(He)/n(H)-2.470 ± 0.110
gridsLei et al. 2018, ApJ 868, 70
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

source filespec-55910-B91003_sp02-097.fits.gz

Gaia astrometry

Gaia DR3 source505063728541561344
parallax [mas]0.9573 ± 0.0313
G15.218
Gabs5.174
μα [mas/yr]-1.813
μδ [mas/yr]7.204
l, b132.540, -4.821

Published (Culpan et al. 2022)

class (Culpan)sdB
class (SIMBAD)sdB
Teff [K]31098 ± 205
log g5.77 ± 0.05
log y-2.86 ± 0.14
reference2021ApJS..256...28L

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-2.06-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-1.84-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-1.74-40.0, 31.64.2-43.0, 43.0
Hε3970.07-1.68-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-1.65-20.0, 26.24.0-31.8, 32.0
Hη3835.38-1.62-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-1.61-16.0, 16.03.9-15.6, 16.7
Hι3770.63-1.60-13.0, 13.03.9-11.7, 11.6
He II 46864685.70-1.99-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-1.89-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-1.71-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-2.09-15.0, 15.05.1-15.0, 15.0