J22275+2236sdB
HS2225+2220 · 22:27:32.69 22:36:10.22 · Culpan knownhsd
χ²/N = 0.99
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] | 31549 ± 157 |
| log g | 5.903 ± 0.024 |
| log n(He)/n(H) | -2.015 ± 0.079 |
| reduced χ² | 0.986 over 637 points |
| radial velocity | -43.0 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 19:10:54 |
Fit — uli
| Teff [K] | 31181 ± 217 |
| log g | 5.818 ± 0.029 |
| log n(He)/n(H) | -1.991 ± 0.077 |
| reduced χ² | 0.985 over 637 points |
| radial velocity | -43.0 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 18:37:31 |
Observation
| telescope | SDSS 2.5-M |
| survey / programme | boss |
| date | 2013-07-05 |
| exposure | 9008 s in 20 |
| pipeline | v5_13_2 |
| cosmic rays | 7 pixels cancelled |
| S/N (classifier) | 81.4 |
| source file | spec-6299-56478-0216.fits |
Gaia astrometry
| Gaia DR3 source | 1875278658119889408 |
| parallax [mas] | 0.6305 ± 0.0587 |
| G | 15.940 |
| Gabs | 4.975 |
| μα [mas/yr] | -12.563 |
| μδ [mas/yr] | -4.949 |
| l, b | 84.472, -29.320 |
Published (Culpan et al. 2022)
| class (Culpan) | sdB |
| class (SIMBAD) | sdB |
| Teff [K] | 31500 ± 800 |
| log g | 5.85 ± 0.10 |
| log y | -1.60 ± 0.20 |
| reference | 2003A&A...400..939E |
Classifier
AGREES
fitted Teff 31500 logg 5.85 logY -1.6 2003A&A...400..939E
auto: contrast 0.05, within the 0.29 a subdwarf reaches at 29 kK, Mg I b suggests a companion but Ca II does not (0.5 sigma)
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -0.70 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -0.62 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -0.59 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -0.57 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -0.56 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -0.55 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -0.54 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -0.54 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | -0.67 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -0.64 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -0.58 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -0.71 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |
Spectral energy distribution
Teff 31549 K · log g 5.903 · E(44−55) 0.052 · χ²r 0.24 over 38 bands
distance 1586 pc · parallax 0.6300 ± 0.0600 mas (10%) · R 0.1318 +0.0137 −0.0113 R☉ · M 0.507 +0.131 −0.098 M☉ · L 15.5 +3.4 −2.6 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.