J22408+5437
Culpan hotsd
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] | 38808 ± 509 |
| log g | 5.535 ± 0.069 |
| log n(He)/n(H) | -1.309 ± 0.075 |
| reduced χ² | 0.977 over 638 points |
| radial velocity | -247.0 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 19:10:56 |
Fit — uli
| Teff [K] | 36290 ± 331 |
| log g | 5.349 ± 0.070 |
| log n(He)/n(H) | -1.267 ± 0.070 |
| reduced χ² | 0.990 over 638 points |
| radial velocity | -247.0 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 18:37:32 |
Observation
| source file | spec-100601-60310-63050394943960848.fits |
Gaia astrometry
| Gaia DR3 source | 2003241230122936064 |
| parallax [mas] | 0.7010 ± 0.0229 |
| G | 14.980 |
| BP − RP | 0.011 |
| Gabs | 4.208 |
| μα [mas/yr] | -1.087 |
| μδ [mas/yr] | 2.028 |
| RUWE | 0.950 |
| l, b | 104.700, -3.552 |
| selection | f_plx |
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -4.01 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -3.58 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -3.38 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -3.27 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -3.20 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -3.16 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -3.13 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -3.11 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | -3.86 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -3.68 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -3.32 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -4.06 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |
Spectral energy distribution
Component 1, the subdwarf: Teff 38808 K (held) · log g 5.535 (held) · R 0.2185 R☉ (fitted, with the companion) · χ²r 1.80 over 32 bands
E(44−55) 0.302 (held)
Component 2, the companion: Teff 4250 K (fitted, 3500–8750 K grid) · log g 4.50 (held) · R 0.5454 R☉ (fitted) · χ²r 0.65 for the two components together (Δχ² 69 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 1427 pc · parallax 0.7000 ± 0.0200 mas (3%) · M 0.756 +0.113 −0.098 M☉ — above the 0.47 canonical mass · (from the ONE-star scale -- not corrected for the companion's light) · L 123.6 +10.6 −9.6 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.