J16237+1229sdB
PG1621+126 · 16:23:44.86 12:29:13.13 · Culpan knownhsd
χ²/N = 1.00
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] | 28252 ± 174 |
| log g | 5.651 ± 0.028 |
| log n(He)/n(H) | -3.030 ± 0.089 |
| reduced χ² | 0.997 over 639 points |
| radial velocity | -93.0 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 19:09:40 |
Fit — uli
| Teff [K] | 28898 ± 196 |
| log g | 5.565 ± 0.029 |
| log n(He)/n(H) | -2.995 ± 0.056 |
| reduced χ² | 0.993 over 639 points |
| radial velocity | -93.0 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 18:36:29 |
Observation
| telescope | SDSS 2.5-M |
| survey / programme | boss |
| date | 2010-06-14 |
| exposure | 8108 s in 18 |
| pipeline | v5_13_2 |
| S/N (classifier) | 78.5 |
| source file | spec-4067-55361-0224.fits |
Gaia astrometry
| Gaia DR3 source | 4460144011560675584 |
| parallax [mas] | 0.5768 ± 0.0494 |
| G | 15.784 |
| Gabs | 4.645 |
| μα [mas/yr] | -0.584 |
| μδ [mas/yr] | -2.324 |
| l, b | 27.442, 38.359 |
Published (Culpan et al. 2022)
| class (Culpan) | sdB |
| class (SIMBAD) | sdB |
Classifier
AGREES
auto: contrast 0.12, within the 0.31 a subdwarf reaches at 27 kK, Mg I b suggests a companion but Ca II does not (0.2 sigma)
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -1.51 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -1.35 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -1.27 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -1.23 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -1.21 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -1.19 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -1.18 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -1.17 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | -1.45 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -1.39 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -1.25 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -1.53 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |
Spectral energy distribution
Teff 28252 K · log g 5.651 · E(44−55) 0.090 · χ²r 0.26 over 37 bands
distance 1734 pc · parallax 0.5800 ± 0.0500 mas (9%) · R 0.1827 +0.0174 −0.0145 R☉ · M 0.547 +0.132 −0.101 M☉ · L 19.2 +3.9 −3.0 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.