J15338+3759

FBS1531+381  ·  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]28410 ± 212
log g5.653 ± 0.033
log n(He)/n(H)-2.349 ± 0.034
reduced χ²0.998 over 637 points
radial velocity-16.0 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 18:31:45

Fit — Lei (TLUSTY)

Teff [K]29300 ± 120
log g5.550 ± 0.010
log n(He)/n(H)-2.340 ± 0.030
gridsLei et al. 2018, ApJ 868, 70
SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

source filespec-58902-HD153027N364816V02_sp09-081.fits.gz

Gaia astrometry

Gaia DR3 source1375814952762454272
parallax [mas]1.9045 ± 0.0345
G12.941
Gabs4.369
μα [mas/yr]0.219
μδ [mas/yr]-17.108
l, b61.129, 54.416

Published (Culpan et al. 2022)

class (Culpan)sdB+dM
class (SIMBAD)sdB+dM
Teff [K]29230 ± 125
log g5.58 ± 0.03
log y-2.37 ± 0.05
reference2010ApJ...708..253F

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-0.26-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-0.23-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-0.22-40.0, 31.64.2-43.0, 43.0
Hε3970.07-0.21-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-0.21-20.0, 26.24.0-31.8, 32.0
Hη3835.38-0.20-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-0.20-16.0, 16.03.9-15.6, 16.7
Hι3770.63-0.20-13.0, 13.03.9-11.7, 11.6
He II 46864685.70-0.25-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-0.24-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-0.21-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-0.26-15.0, 15.05.1-15.0, 15.0