J10544+0105
SDSSJ105428.85+010514.7 · 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] | 29897 ± 275 |
| log g | 5.604 ± 0.038 |
| log n(He)/n(H) | -2.950 ± 0.160 |
| reduced χ² | 0.983 over 639 points |
| radial velocity | -237.0 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 19:08:27 |
Fit — uli
| Teff [K] | 30429 ± 239 |
| log g | 5.522 ± 0.039 |
| log n(He)/n(H) | -2.917 ± 0.120 |
| reduced χ² | 0.983 over 639 points |
| radial velocity | -237.0 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 18:35:26 |
Observation
| source file | spec-3835-55570-0944.fits |
Gaia astrometry
| Gaia DR3 source | 3808013730864971392 |
| parallax [mas] | 0.4740 ± 0.1004 |
| G | 17.021 |
| μα [mas/yr] | -7.197 |
| μδ [mas/yr] | -4.622 |
| l, b | 250.886, 51.730 |
Published (Culpan et al. 2022)
| class (Culpan) | sdB |
| class (SIMBAD) | sdB |
| Teff [K] | 33682 ± 213 |
| log g | 5.99 ± 0.06 |
| log y | -2.12 ± 0.07 |
| reference | 2021ApJS..256...28L |
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -3.84 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -3.43 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -3.24 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -3.14 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -3.07 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -3.03 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -3.00 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -2.98 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | -3.70 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -3.54 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -3.18 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -3.89 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |
Spectral energy distribution
Teff 29897 K · log g 5.604 · E(44−55) 0.048 · χ²r 0.91 over 15 bands
distance 2110 pc · parallax 0.4700 ± 0.1000 mas (21%) · R 0.1115 +0.0302 −0.0194 R☉ · M 0.183 +0.117 −0.061 M☉ — below the 0.47 canonical mass · L 9.0 +5.5 −2.9 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.