J01236+3002
SDSSJ012340.69+300232.16 · Culpan knownhsd
χ²/N = 1.01
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] | 27163 ± 192 |
| log g | 5.386 ± 0.033 |
| log n(He)/n(H) | -1.991 ± 0.054 |
| reduced χ² | 1.007 over 639 points |
| radial velocity | 117.0 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 19:07:19 |
Fit — uli
| Teff [K] | 27501 ± 242 |
| log g | 5.293 ± 0.035 |
| log n(He)/n(H) | -1.958 ± 0.061 |
| reduced χ² | 1.007 over 639 points |
| radial velocity | 117.0 km s−1 |
| resolution (FWHM) | 2.00 Å |
| lines fitted | 12 |
| grids | h909.grid h97.grid h99.grid h999.grid |
| fitted | 04/09/2026 18:34:34 |
Observation
| cosmic rays | 3 pixels cancelled |
| source file | spec-6596-56331-0285.fits |
Gaia astrometry
| Gaia DR3 source | 309391787394140288 |
| parallax [mas] | 0.3716 ± 0.0692 |
| G | 16.474 |
| Gabs | 4.423 |
| μα [mas/yr] | 5.988 |
| μδ [mas/yr] | -5.003 |
| l, b | 131.189, -32.312 |
Published (Culpan et al. 2022)
| class (Culpan) | sdB |
| class (SIMBAD) | sdB |
| Teff [K] | 31386 ± 257 |
| log g | 5.56 ± 0.06 |
| log y | -2.14 ± 0.06 |
| reference | 2021ApJS..256...28L |
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | 1.90 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | 1.69 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | 1.60 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | 1.55 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | 1.52 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | 1.50 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | 1.48 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | 1.47 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | 1.83 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | 1.75 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | 1.57 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | 1.92 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |
Spectral energy distribution
Component 1, the subdwarf: Teff 27163 K (held) · log g 5.386 (held) · R 0.1792 R☉ (fitted, with the companion) · χ²r 1.03 over 34 bands
E(44−55) 0.053 (held)
Component 2, the companion: Teff 5375 K (fitted, 3500–8750 K grid) · log g 4.50 (held) · R 0.6741 R☉ (fitted) · χ²r 0.57 for the two components together (Δχ² 288 over one star, same bands)
The dashed curves beneath the model are the two components of this fit: the subdwarf alone and the cool companion.
distance 2691 pc · parallax 0.3700 ± 0.0700 mas (19%) · M 0.613 +0.332 −0.187 M☉ · (from the ONE-star scale -- not corrected for the companion's light) · L 33.9 +17.4 −9.9 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.