J16461+4017

PG1644+403  ·  Culpan knownhsd

χ²/N = 1.00

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]28935 ± 295
log g5.770 ± 0.051
log n(He)/n(H)-1.874 ± 0.068
reduced χ²0.996 over 638 points
radial velocity-102.0 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 18:32:14

Fit — Lei (TLUSTY)

Teff [K]29810 ± 130
log g5.690 ± 0.010
log n(He)/n(H)-1.930 ± 0.050
gridsLei et al. 2019, ApJ 881, 135
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

cosmic rays11 pixels cancelled
source filespec-56424-HD164719N421420M01_sp01-066.fits.gz

Gaia astrometry

Gaia DR3 source1355775219474985856
parallax [mas]1.2784 ± 0.0280
G14.080
Gabs4.625
μα [mas/yr]-17.226
μδ [mas/yr]7.070
l, b64.137, 40.373

Published (Culpan et al. 2022)

class (Culpan)sdB
class (SIMBAD)sdB1.5VIIHe2
Teff [K]31082 ± 278
log g5.85 ± 0.07
log y-2.07 ± 0.10
reference2021ApJS..256...28L

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-1.65-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-1.48-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-1.40-40.0, 31.64.2-43.0, 43.0
Hε3970.07-1.35-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-1.32-20.0, 26.24.0-31.8, 32.0
Hη3835.38-1.30-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-1.29-16.0, 16.03.9-15.6, 16.7
Hι3770.63-1.28-13.0, 13.03.9-11.7, 11.6
He II 46864685.70-1.59-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-1.52-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-1.37-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-1.67-15.0, 15.05.1-15.0, 15.0