J12533+3006sdOB

PG1250+303  ·  12:53:18.50 30:06:29.34  ·  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.

Line-profile fit — uli

profile fit on the uli grid
Observed spectrum in black, model in red, offset by line. Balmer series left, helium right.

Results and provenance

Fit — Bamberg

Teff [K]33910 ± 200
log g5.822 ± 0.025
log n(He)/n(H)-2.102 ± 0.061
reduced χ²0.982 over 639 points
radial velocity-4.0 km s−1
resolution (FWHM)2.00 Å
lines fitted12
gridsHE-0.041.fits
HE-0.125.fits
HE-0.300.fits
HE-0.550.fits
+9 more
fitted04/09/2026 19:08:53

Fit — uli

Teff [K]33336 ± 292
log g5.759 ± 0.031
log n(He)/n(H)-2.101 ± 0.065
reduced χ²0.979 over 639 points
radial velocity-4.0 km s−1
resolution (FWHM)2.00 Å
lines fitted12
gridsh667.grid
h909.grid
h97.grid
h99.grid
+1 more
fitted04/09/2026 18:35:50

Observation

telescopeSDSS 2.5-M
survey / programmeboss
date2013-03-07
exposure6306 s in 14
pipelinev5_13_2
cosmic rays3 pixels cancelled
S/N (classifier)71.0
source filespec-6484-56358-0480.fits

Gaia astrometry

Gaia DR3 source1465043619891174016
parallax [mas]0.5595 ± 0.0577
G15.833
Gabs4.601
μα [mas/yr]0.856
μδ [mas/yr]-8.010
l, b115.199, 86.992

Published (Culpan et al. 2022)

class (Culpan)sdB
class (SIMBAD)sdB
Teff [K]35541 ± 211
log g5.98 ± 0.04
log y-1.90 ± 0.03
reference2021ApJS..256...28L

Classifier

DISPUTED

fitted Teff 35541 logg 5.98 logY -1.9 2021ApJS..256...28L

auto: He II 0.31 (3.2 sigma), Mg I b suggests a companion but Ca II does not (0.8 sigma)

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-0.06-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-0.06-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-0.05-40.0, 31.64.2-43.0, 43.0
Hε3970.07-0.05-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-0.05-20.0, 26.24.0-31.8, 32.0
Hη3835.38-0.05-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-0.05-16.0, 16.03.9-15.6, 16.7
Hι3770.63-0.05-13.0, 13.03.9-11.7, 11.6
He II 46864685.70-0.06-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-0.06-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-0.05-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-0.07-15.0, 15.05.1-15.0, 15.0

Spectral energy distribution

Teff 33910 K · log g 5.822 · E(44−55) 0.006 · χ²r 0.26 over 39 bands

distance 1787 pc · parallax 0.5600 ± 0.0600 mas (11%) · R 0.1363 +0.0158 −0.0127 R☉ · M 0.450 +0.127 −0.093 M☉ · L 22.1 +5.4 −4.0 L☉

Photometry against the model, with the residual beneath it in units of the error. The horizontal bar on each point is the passband, not an error; a hollow point was not fitted and the tooltip says why. Drag a box to zoom, double-click or Esc to come back out.