J08449-0558
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
Results and provenance
Fit — Bamberg
| Teff [K] | 53475 ± 2237 |
| log g | 6.155 ± 0.128 |
| log n(He)/n(H) | -2.076 ± 0.133 |
| reduced χ² | 0.983 over 745 points |
| radial velocity | -195.0 km s−1 |
| resolution (FWHM) | 2.00 Å |
| lines fitted | 15 |
| grids | HE-0.041.fits HE-0.125.fits HE-0.300.fits HE-0.550.fits +9 more |
| fitted | 04/09/2026 19:08:03 |
Observation
| source file | spec-111386-60351-63050396004585863.fits |
Gaia astrometry
| Gaia DR3 source | 5760469888980571648 |
| parallax [mas] | 0.4501 ± 0.0841 |
| G | 16.983 |
| BP − RP | -0.290 |
| Gabs | 5.250 |
| μα [mas/yr] | -2.629 |
| μδ [mas/yr] | -5.425 |
| RUWE | 1.006 |
| l, b | 232.331, 21.922 |
| selection | f_plx |
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -3.16 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -2.82 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -2.67 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -2.58 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -2.53 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -2.49 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -2.47 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -2.45 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | -3.05 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He II 5412 | 5411.52 | -3.52 | -15.0, 15.0 | 5.6 | -15.0, 15.0 |
| He II 4542 | 4541.59 | -2.95 | -15.0, 20.0 | 4.7 | -20.0, 20.0 |
| He II 4200 | 4199.84 | -2.73 | -23.5, 33.8 | 4.3 | -20.0, 20.0 |
| He I 4472 | 4471.60 | -2.91 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -2.62 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -3.20 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |
Spectral energy distribution
Component 1, the subdwarf: Teff 53475 K (held) · log g 6.155 (held) · R 0.0704 R☉ (fitted, with the companion) · χ²r 1.63 over 35 bands
E(44−55) 0.017 (held)
Component 2, the companion: Teff 4500 K (fitted, 3500–8750 K grid) · log g 4.50 (held) · R 0.4624 R☉ (fitted) · χ²r 0.09 for the two components together (Δχ² 180 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 2222 pc · parallax 0.4500 ± 0.0800 mas (18%) · M 0.466 +0.253 −0.143 M☉ · (from the ONE-star scale -- not corrected for the companion's light) · L 65.9 +33.9 −19.3 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.