J15385+0308
SDSSJ153834.07+030812.9 · 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
Line-profile fit — uli
Results and provenance
Fit — Bamberg
| Teff [K] | 34876 ± 238 |
| log g | 5.962 ± 0.034 |
| log n(He)/n(H) | -1.764 ± 0.050 |
| reduced χ² | 0.981 over 637 points |
| radial velocity | -76.0 km s−1 |
| resolution (FWHM) | 2.00 Å |
| lines fitted | 12 |
| grids | HE-0.041.fits HE-0.125.fits HE-0.300.fits HE-0.550.fits +9 more |
| fitted | 04/09/2026 19:09:28 |
Fit — uli
| Teff [K] | 33440 ± 530 |
| log g | 5.912 ± 0.036 |
| log n(He)/n(H) | -1.721 ± 0.035 |
| reduced χ² | 0.978 over 637 points |
| radial velocity | -76.0 km s−1 |
| resolution (FWHM) | 2.00 Å |
| lines fitted | 12 |
| grids | h667.grid h909.grid h97.grid h99.grid +1 more |
| fitted | 04/09/2026 18:36:19 |
Observation
| source file | spec-4054-55358-0824.fits |
Gaia astrometry
| Gaia DR3 source | 4424182662707293184 |
| parallax [mas] | 0.2597 ± 0.0710 |
| G | 16.949 |
| μα [mas/yr] | -0.015 |
| μδ [mas/yr] | -7.884 |
| l, b | 9.322, 43.441 |
Published (Culpan et al. 2022)
| class (Culpan) | sdOB |
| class (SIMBAD) | DAO/sdO |
| Teff [K] | 34469 ± 849 |
| log g | 5.94 ± 0.11 |
| log y | -1.77 ± 0.28 |
| reference | 2019MNRAS.486.2169K |
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -1.23 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -1.10 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -1.04 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -1.01 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -0.99 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -0.97 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -0.96 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -0.96 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | -1.19 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -1.13 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -1.02 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -1.25 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |
Spectral energy distribution
Teff 34876 K · log g 5.962 · E(44−55) 0.060 · χ²r 0.17 over 29 bands
distance 3851 pc · parallax 0.2600 ± 0.0700 mas (27%) · R 0.1859 +0.0704 −0.0398 R☉ · M 1.154 +1.067 −0.451 M☉ — above the 0.47 canonical mass · L 46.1 +41.5 −17.7 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.