J15332+4435

PG1531+447  ·  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]29072 ± 181
log g5.790 ± 0.029
log n(He)/n(H)-1.869 ± 0.044
reduced χ²0.994 over 638 points
radial velocity-172.0 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 18:31:44

Fit — Lei (TLUSTY)

Teff [K]30400 ± 150
log g5.800 ± 0.030
log n(He)/n(H)-1.910 ± 0.030
gridsLei et al. 2018, ApJ 868, 70
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

cosmic rays3 pixels cancelled
source filespec-57821-HD153447N440403B01_sp04-042.fits.gz

Gaia astrometry

Gaia DR3 source1394581623383963264
parallax [mas]0.7213 ± 0.0361
G15.524
Gabs4.821
μα [mas/yr]-9.371
μδ [mas/yr]5.041
l, b72.189, 53.357

Published (Culpan et al. 2022)

class (Culpan)sdB
class (SIMBAD)sdB
Teff [K]30963 ± 155
log g5.69 ± 0.03
log y-1.77 ± 0.02
reference2021ApJS..256...28L

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-2.79-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-2.49-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-2.35-40.0, 31.64.2-43.0, 43.0
Hε3970.07-2.28-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-2.23-20.0, 26.24.0-31.8, 32.0
Hη3835.38-2.20-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-2.18-16.0, 16.03.9-15.6, 16.7
Hι3770.63-2.16-13.0, 13.03.9-11.7, 11.6
He II 46864685.70-2.69-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-2.57-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-2.31-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-2.82-15.0, 15.05.1-15.0, 15.0