J09472+0531sdO
SDSSJ094712.33+053158.0 · 09:47:12.34 05:31:58.12 · Culpan knownhsd
χ²/N = 1.01
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
Results and provenance
Fit — Bamberg
| Teff [K] | 52436 ± 2081 |
| log g | 6.059 ± 0.184 |
| log n(He)/n(H) | -0.938 ± 0.160 |
| reduced χ² | 1.005 over 745 points |
| radial velocity | -68.0 km s−1 |
| resolution (FWHM) | 2.00 Å |
| lines fitted | 15 |
| grids | HE-0.041.fits HE-0.125.fits HE-0.300.fits HE-0.550.fits +9 more |
| fitted | 04/09/2026 19:08:11 |
Observation
| telescope | SDSS 2.5-M |
| survey / programme | boss |
| date | 2011-04-21 |
| exposure | 3603 s in 8 |
| pipeline | v5_13_2 |
| S/N (classifier) | 21.7 |
| source file | spec-4798-55672-0869.fits |
Gaia astrometry
| Gaia DR3 source | 3852976094219128448 |
| parallax [mas] | -0.0429 ± 0.2219 |
| G | 18.870 |
| μα [mas/yr] | -1.902 |
| μδ [mas/yr] | -3.029 |
| l, b | 230.662, 41.199 |
Published (Culpan et al. 2022)
| class (Culpan) | He-sdO |
| class (SIMBAD) | sdO |
| Teff [K] | 72900 ± 7500 |
| log g | 5.75 ± 0.27 |
| log y | -0.60 ± 0.30 |
| reference | Geierprep |
Classifier
DISPUTED
fitted Teff 72900 logg 5.75 logY -0.6 Geierprep
auto: He II/He I 7.8, EW 1.18, Ca II 8662/8542 = 14.1 -- the star's own Paschen lines, not a companion; contrast 0.08 over the 0.02 expected at 61 kK
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -1.10 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -0.98 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -0.93 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -0.90 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -0.88 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -0.87 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -0.86 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -0.86 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | -1.06 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He II 5412 | 5411.52 | -1.23 | -15.0, 15.0 | 5.6 | -15.0, 15.0 |
| He II 4542 | 4541.59 | -1.03 | -15.0, 20.0 | 4.7 | -20.0, 20.0 |
| He II 4200 | 4199.84 | -0.95 | -23.5, 33.8 | 4.3 | -20.0, 20.0 |
| He I 4472 | 4471.60 | -1.01 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -0.91 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -1.12 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |