J04007+1718

LAMOSTJ040047.29+171842.0  ·  Culpan knownhsd

χ²/N = 0.98

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]27152 ± 323
log g5.535 ± 0.057
log n(He)/n(H)-3.153 ± 0.174
reduced χ²0.978 over 659 points
radial velocity-90.0 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 18:26:30

Fit — Lei (TLUSTY)

Teff [K]28750 ± 290
log g5.570 ± 0.040
log n(He)/n(H)-3.150 ± 0.200
gridsLei et al. 2018, ApJ 868, 70
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

cosmic rays15 pixels cancelled
source filespec-57009-GAC058N16B1_sp13-233.fits.gz

Gaia astrometry

Gaia DR3 source46608061680943872
parallax [mas]0.7777 ± 0.0400
G15.430
Gabs5.004
μα [mas/yr]-0.778
μδ [mas/yr]7.871
l, b174.361, -26.111

Published (Culpan et al. 2022)

class (Culpan)sdB
Teff [K]29995 ± 221
log g5.62 ± 0.04
log y-2.90 ± 0.08
reference2021ApJS..256...28L

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-1.46-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-1.30-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-1.23-40.0, 31.64.2-43.0, 43.0
Hε3970.07-1.19-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-1.17-20.0, 26.24.0-31.8, 32.0
Hη3835.38-1.15-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-1.14-16.0, 16.03.9-15.6, 16.7
Hι3770.63-1.13-13.0, 13.03.9-11.7, 11.6
Hκ3750.15-1.13-10.0, 10.03.9-7.4, 8.7
He II 46864685.70-1.41-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-1.34-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-1.21-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-1.48-15.0, 15.05.1-15.0, 15.0