J08434+0824sdB
SDSSJ084328.87+082438.2 · 08:43:28.87 08:24:38.38 · Culpan knownhsd
χ²/N = 0.98
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] | 23982 ± 190 |
| log g | 5.630 ± 0.023 |
| log n(He)/n(H) | -3.970 ± 0.331 |
| reduced χ² | 0.983 over 659 points |
| radial velocity | -59.0 km s−1 |
| resolution (FWHM) | 2.00 Å |
| lines fitted | 13 |
| grids | HE-0.041.fits HE-0.125.fits HE-0.300.fits HE-0.550.fits +9 more |
| fitted | 04/09/2026 19:08:00 |
Fit — uli
| Teff [K] | 23851 ± 217 |
| log g | 5.532 ± 0.025 |
| log n(He)/n(H) | -3.317 ± 0.060 upper limit |
| reduced χ² | 0.984 over 659 points |
| radial velocity | -59.0 km s−1 |
| resolution (FWHM) | 2.00 Å |
| lines fitted | 13 |
| grids | h909.grid h97.grid h99.grid h999.grid |
| settled | outside the grid |
| fitted | 04/09/2026 18:35:03 |
Observation
| telescope | SDSS 2.5-M |
| survey / programme | boss |
| date | 2011-11-28 |
| exposure | 7207 s in 16 |
| pipeline | v5_13_2 |
| S/N (classifier) | 69.1 |
| source file | spec-5289-55893-0570.fits |
Gaia astrometry
| Gaia DR3 source | 597102541222525056 |
| parallax [mas] | 0.5130 ± 0.0612 |
| G | 16.422 |
| Gabs | 5.008 |
| μα [mas/yr] | 4.866 |
| μδ [mas/yr] | -9.668 |
| l, b | 218.274, 28.697 |
Published (Culpan et al. 2022)
| class (Culpan) | sdB |
| class (SIMBAD) | DAZ |
| Teff [K] | 26928 ± 350 |
| log g | 5.77 ± 0.04 |
| log y | -3.70 ± 0.15 |
| reference | 2021ApJS..256...28L |
Classifier
AGREES
fitted Teff 26928 logg 5.77 logY -3.7 2021ApJS..256...28L
auto: contrast 0.15, within the 0.35 a subdwarf reaches at 24 kK, Ca II 8662/8542 = 6.7 -- the star's own Paschen lines, not a companion
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -0.96 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -0.85 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -0.81 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -0.78 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -0.77 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -0.75 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -0.75 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -0.74 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| Hκ | 3750.15 | -0.74 | -10.0, 10.0 | 3.9 | -7.4, 8.7 |
| He II 4686 | 4685.70 | -0.92 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -0.88 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -0.79 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -0.97 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |
Spectral energy distribution
Teff 23982 K · log g 5.630 · E(44−55) 0.038 · χ²r 0.15 over 41 bands
distance 1949 pc · parallax 0.5100 ± 0.0600 mas (12%) · R 0.1666 +0.0227 −0.0177 R☉ · M 0.432 +0.141 −0.098 M☉ · L 8.3 +2.4 −1.7 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.