J16557+1301

PG1653+131  ·  Culpan knownhsd

χ²/N = 0.99

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]25744 ± 289
log g5.405 ± 0.045
log n(He)/n(H)-2.488 ± 0.068
reduced χ²0.993 over 659 points
radial velocity-89.0 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 18:32:20

Fit — Lei (TLUSTY)

Teff [K]26230 ± 550
log g5.340 ± 0.060
log n(He)/n(H)-2.500 ± 0.100
gridsLei et al. 2018, ApJ 868, 70
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

source filespec-56395-HD165204N145827M01_sp07-163.fits.gz

Gaia astrometry

Gaia DR3 source4449162845336419840
parallax [mas]0.9366 ± 0.0347
G14.357
Gabs4.255
μα [mas/yr]-1.083
μδ [mas/yr]-12.424
l, b31.975, 31.484

Published (Culpan et al. 2022)

class (Culpan)sdB
class (SIMBAD)sdB
Teff [K]25600 ± 900
log g5.40 ± 0.10
log y-2.70 ± 0.10
reference2001MNRAS.326.1391M

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-1.44-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-1.29-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-1.22-40.0, 31.64.2-43.0, 43.0
Hε3970.07-1.18-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-1.15-20.0, 26.24.0-31.8, 32.0
Hη3835.38-1.14-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-1.13-16.0, 16.03.9-15.6, 16.7
Hι3770.63-1.12-13.0, 13.03.9-11.7, 11.6
Hκ3750.15-1.11-10.0, 10.03.9-7.4, 8.7
He II 46864685.70-1.39-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-1.33-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-1.20-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-1.46-15.0, 15.05.1-15.0, 15.0