J17311+5305

SDSSJ173110.56+530512.5  ·  Culpan knownhsd

χ²/N = 0.85

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]27862 ± 1140
log g5.568 ± 0.213
log n(He)/n(H)-3.079 ± 0.754
reduced χ²0.851 over 636 points
radial velocity98.0 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 18:32:37

Fit — Lei (TLUSTY)

Teff [K]27550 ± 530
log g5.170 ± 0.060
log n(He)/n(H)-2.640 ± 0.210
gridsLei et al. 2019, ApJ 881, 135
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

cosmic rays21 pixels cancelled
source filespec-57900-HD173133N504043M02_sp11-209.fits.gz

Gaia astrometry

Gaia DR3 source1417526777492843136
parallax [mas]0.1931 ± 0.0517
G16.991
μα [mas/yr]-1.257
μδ [mas/yr]-2.272
l, b80.523, 33.228

Published (Culpan et al. 2022)

class (Culpan)sdB
Teff [K]29578 ± 356
log g5.55 ± 0.06
log y-2.66 ± 0.08
reference2021ApJS..256...28L

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.321.59-40.0, 40.05.0-45.0, 45.0
Hγ4340.461.42-40.0, 36.84.5-43.0, 43.0
Hδ4101.731.34-40.0, 31.64.2-43.0, 43.0
Hε3970.071.30-28.0, 30.04.1-30.0, 35.0
Hζ3889.051.27-20.0, 26.24.0-31.8, 32.0
Hη3835.381.25-20.0, 14.64.0-20.7, 21.8
Hθ3797.901.24-16.0, 16.03.9-15.6, 16.7
Hι3770.631.23-13.0, 13.03.9-11.7, 11.6
He II 46864685.701.53-11.9, 11.94.9-15.0, 13.8
He I 44724471.601.46-15.0, 15.04.6-15.0, 15.0
He I 40264026.291.32-24.2, 15.04.2-15.0, 15.0
He I 49224921.931.61-15.0, 15.05.1-15.0, 15.0