J21286-0135sdB
21:28:36.41 -01:35:30.08 · Culpan hotsd
χ²/N = 0.97
Spectrum
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] | 29697 ± 188 |
| log g | 5.850 ± 0.031 |
| log n(He)/n(H) | -2.699 ± 0.077 |
| reduced χ² | 0.974 over 639 points |
| radial velocity | -90.0 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 19:10:44 |
Fit — uli
| Teff [K] | 30309 ± 143 |
| log g | 5.768 ± 0.033 |
| log n(He)/n(H) | -2.730 ± 0.070 |
| reduced χ² | 0.974 over 639 points |
| radial velocity | -90.0 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 18:37:24 |
Observation
| telescope | SDSS 2.5-M |
| survey / programme | MWM / mwm_cb |
| field · MJD | 104646 · 60605 |
| date | 2024-10-21 |
| catalogid | 63050395070543830 |
| exposure | 4500 s in 5 |
| airmass | 1.21 |
| seeing (50%) | 1.67″ |
| E(B−V) | 0.059 |
| pipeline | v6_2_1 |
| S/N (classifier) | 62.1 |
| source file | spec-104646-60605-63050395070543830.fits |
Gaia astrometry
| Gaia DR3 source | 2685246062067554816 |
| parallax [mas] | 0.5992 ± 0.0470 |
| G | 15.478 |
| BP − RP | -0.359 |
| Gabs | 4.366 |
| μα [mas/yr] | 5.413 |
| μδ [mas/yr] | -4.890 |
| RUWE | 0.956 |
| l, b | 51.770, -35.174 |
| selection | f_plx |
Classifier
NEW
auto: contrast 0.10, within the 0.28 a subdwarf reaches at 30 kK, Mg I b suggests a companion but Ca II does not (-1.3 sigma)
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -1.46 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -1.30 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -1.23 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -1.19 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -1.17 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -1.15 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -1.14 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -1.13 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | -1.41 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -1.34 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -1.21 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -1.48 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |
Spectral energy distribution
Teff 29697 K · log g 5.850 · E(44−55) 0.062 · χ²r 0.30 over 41 bands
distance 1669 pc · parallax 0.6000 ± 0.0500 mas (8%) · R 0.1849 +0.0159 −0.0135 R☉ · M 0.885 +0.198 −0.155 M☉ — above the 0.47 canonical mass · L 24.0 +4.4 −3.4 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.