J18053-5430
Culpan hotsd
χ²/N = 0.97
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] | 28347 ± 758 |
| log g | 5.490 ± 0.130 |
| log n(He)/n(H) | -3.112 ± 0.364 |
| reduced χ² | 0.971 over 575 points |
| radial velocity | -29.0 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 19:10:10 |
Observation
| source file | spec-025938-60169-27021599430919638.fits |
Gaia astrometry
| Gaia DR3 source | 6653263164553823232 |
| parallax [mas] | 0.3682 ± 0.0600 |
| G | 16.384 |
| BP − RP | 0.150 |
| Gabs | 4.215 |
| μα [mas/yr] | -7.682 |
| μδ [mas/yr] | -0.608 |
| RUWE | 1.223 |
| l, b | 339.133, -15.548 |
| selection | f_plx |
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -0.47 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -0.42 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -0.40 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -0.38 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -0.38 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -0.37 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| H\d10 3797.90 ---- | |||||
| H\d11 3770.63 ---- | |||||
| He II 4686 | 4685.70 | -0.45 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -0.43 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -0.39 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -0.48 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |
Spectral energy distribution
Component 1, the subdwarf: Teff 28347 K (held) · log g 5.490 (held) · R 0.1795 R☉ (fitted, with the companion) · χ²r 1.31 over 36 bands
E(44−55) 0.086 (held)
Component 2, the companion: Teff 5500 K (fitted, 3500–8750 K grid) · log g 4.50 (held) · R 0.8811 R☉ (fitted) · χ²r 0.39 for the two components together (Δχ² 819 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 2716 pc · parallax 0.3700 ± 0.0600 mas (16%) · M 1.194 +0.549 −0.334 M☉ — above the 0.47 canonical mass · (from the ONE-star scale -- not corrected for the companion's light) · L 61.6 +26.5 −16.2 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.