J16117+5540sdO
SDSSJ161143.29+554044.39 · 16:11:43.30 55:40:44.40 · Culpan knownhsd
outside the grid 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] | 55670 ± 2087 |
| log g | 5.403 ± 0.102 |
| log n(He)/n(H) | -1.054 ± 0.105 |
| reduced χ² | 1.006 over 745 points |
| radial velocity | 356.0 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 |
| settled | outside the grid |
| fitted | 04/09/2026 19:09:36 |
Observation
| telescope | SDSS 2.5-M |
| survey / programme | boss |
| date | 2013-05-18 |
| exposure | 3603 s in 8 |
| pipeline | v5_13_2 |
| S/N (classifier) | 31.9 |
| source file | spec-6793-56430-0867.fits |
Gaia astrometry
| Gaia DR3 source | 1429687032498740992 |
| parallax [mas] | 0.1300 ± 0.0931 |
| G | 18.215 |
| μα [mas/yr] | -0.065 |
| μδ [mas/yr] | -0.893 |
| l, b | 85.751, 44.320 |
Published (Culpan et al. 2022)
| class (Culpan) | He-sdO |
| class (SIMBAD) | sdO |
| Teff [K] | 55800 ± 3900 |
| log g | 5.25 ± 0.14 |
| log y | -0.60 ± 0.10 |
| reference | Geierprep |
Classifier
DISPUTED
fitted Teff 55800 logg 5.25 logY -0.6 Geierprep
auto: He II/He I 9.0, EW 1.36, Ca II 8662/8542 = 11.1 -- the star's own Paschen lines, not a companion; contrast 0.07 over the 0.02 expected at 66 kK
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | 5.77 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | 5.15 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | 4.87 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | 4.71 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | 4.62 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | 4.55 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | 4.51 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | 4.48 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | 5.56 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He II 5412 | 5411.52 | 6.43 | -15.0, 15.0 | 5.6 | -15.0, 15.0 |
| He II 4542 | 4541.59 | 5.39 | -15.0, 20.0 | 4.7 | -20.0, 20.0 |
| He II 4200 | 4199.84 | 4.99 | -23.5, 33.8 | 4.3 | -20.0, 20.0 |
| He I 4472 | 4471.60 | 5.31 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | 4.78 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | 5.84 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |