J22566+2945sdOB

SDSSJ225640.87+294546.70  ·  22:56:40.87 29:45:46.73  ·  Culpan knownhsd

χ²/N = 0.96

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]37964 ± 267
log g5.987 ± 0.036
log n(He)/n(H)-1.498 ± 0.034
reduced χ²0.957 over 634 points
radial velocity-3.0 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 19:11:00

Fit — uli

Teff [K]36210 ± 211
log g5.869 ± 0.040
log n(He)/n(H)-1.470 ± 0.037
reduced χ²0.950 over 634 points
radial velocity-3.0 km s−1
resolution (FWHM)2.00 Å
lines fitted12
gridsh667.grid
h909.grid
h97.grid
h99.grid
+1 more
fitted04/09/2026 18:37:35

Observation

telescopeSDSS 2.5-M
survey / programmeboss
date2013-09-26
exposure5401 s in 12
pipelinev5_13_2
S/N (classifier)62.4
source filespec-6293-56561-0704.fits

Gaia astrometry

Gaia DR3 source1886200725594365568
parallax [mas]0.3347 ± 0.0601
G16.322
Gabs3.945
μα [mas/yr]0.052
μδ [mas/yr]-5.032
l, b95.091, -26.833

Published (Culpan et al. 2022)

class (Culpan)sdOB
class (SIMBAD)sdO
Teff [K]37866 ± 190
log g5.92 ± 0.03
log y-1.38 ± 0.03
reference2021ApJS..256...28L

Classifier

AGREES

fitted Teff 37866 logg 5.92 logY -1.38 2021ApJS..256...28L

auto: He II 0.28 (2.6 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
Hβ4861.32-0.05-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-0.04-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-0.04-40.0, 31.64.2-43.0, 43.0
Hε3970.07-0.04-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-0.04-20.0, 26.24.0-31.8, 32.0
Hη3835.38-0.04-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-0.04-16.0, 16.03.9-15.6, 16.7
Hι3770.63-0.04-13.0, 13.03.9-11.7, 11.6
He II 46864685.70-0.05-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-0.04-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-0.04-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-0.05-15.0, 15.05.1-15.0, 15.0

Spectral energy distribution

Teff 37964 K · log g 5.987 · E(44−55) 0.076 · χ²r 0.10 over 34 bands

distance 2988 pc · parallax 0.3300 ± 0.0600 mas (18%) · R 0.1831 +0.0404 −0.0278 R☉ · M 1.190 +0.614 −0.353 M☉ — above the 0.47 canonical mass · L 62.8 +30.8 −17.8 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.