J04472+2039

SDSSJ044715.48+203958.2  ·  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]30541 ± 559
log g5.793 ± 0.074
log n(He)/n(H)-1.857 ± 0.093
reduced χ²0.984 over 637 points
radial velocity-43.0 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 18:26:43

Fit — Lei (TLUSTY)

Teff [K]30250 ± 700
log g5.510 ± 0.120
log n(He)/n(H)-1.880 ± 0.240
gridsLei et al. 2018, ApJ 868, 70
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

cosmic rays9 pixels cancelled
source filespec-57014-GAC073N19B2_sp16-013.fits.gz

Gaia astrometry

Gaia DR3 source3411847601045302144
parallax [mas]1.2096 ± 0.0390
G15.530
Gabs6.020
μα [mas/yr]-2.079
μδ [mas/yr]-9.118
l, b179.257, -15.576

Published (Culpan et al. 2022)

class (Culpan)sdB
class (SIMBAD)sd
Teff [K]31862 ± 202
log g5.86 ± 0.05
log y-2.06 ± 0.04
reference2021ApJS..256...28L

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-0.70-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-0.62-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-0.59-40.0, 31.64.2-43.0, 43.0
Hε3970.07-0.57-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-0.56-20.0, 26.24.0-31.8, 32.0
Hη3835.38-0.55-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-0.54-16.0, 16.03.9-15.6, 16.7
Hι3770.63-0.54-13.0, 13.03.9-11.7, 11.6
He II 46864685.70-0.67-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-0.64-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-0.58-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-0.71-15.0, 15.05.1-15.0, 15.0