J08189+3954

PG0815+405  ·  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]21339 ± 199
log g5.468 ± 0.026
log n(He)/n(H)-3.421 ± 0.193
reduced χ²0.996 over 659 points
radial velocity-1.0 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 18:29:07

Fit — Lei (TLUSTY)

Teff [K]22910 ± 210
log g5.440 ± 0.070
log n(He)/n(H)-3.480 ± 0.290
gridsLei et al. 2020, ApJ 889, 117
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

source filespec-58155-HD083110N401329B01_sp10-128.fits.gz

Gaia astrometry

Gaia DR3 source909317797165729024
parallax [mas]0.8714 ± 0.0410
G14.918
Gabs4.679
μα [mas/yr]10.398
μδ [mas/yr]-5.800
l, b181.181, 33.154

Published (Culpan et al. 2022)

class (Culpan)sdB
class (SIMBAD)B1
Teff [K]23067 ± 172
log g5.55 ± 0.03
log y-3.54 ± 0.10
reference2021ApJS..256...28L

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-0.02-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-0.01-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-0.01-40.0, 31.64.2-43.0, 43.0
Hε3970.07-0.01-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-0.01-20.0, 26.24.0-31.8, 32.0
Hη3835.38-0.01-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-0.01-16.0, 16.03.9-15.6, 16.7
Hι3770.63-0.01-13.0, 13.03.9-11.7, 11.6
Hκ3750.15-0.01-10.0, 10.03.9-7.4, 8.7
He II 46864685.70-0.02-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-0.01-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-0.01-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-0.02-15.0, 15.05.1-15.0, 15.0