J18549-7042
Culpan hotsd
χ²/N = 1.00
Spectrum
shaded: the intervals the fit used · │ a cancelled pixeldrag on either panel to zoom · dbl-click or Esc to reset · arrows to pan
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] | 20213 ± 686 |
| log g | 5.387 ± 0.106 |
| log n(He)/n(H) | -3.323 ± 0.289 |
| reduced χ² | 0.998 over 660 points |
| radial velocity | -101.0 km s−1 |
| resolution (FWHM) | 2.00 Å |
| lines fitted | 13 |
| grids | HE-0.041.fits HE-0.125.fits HE-0.300.fits HE-0.550.fits +9 more |
| fitted | 04/09/2026 19:10:20 |
Fit — uli
| Teff [K] | 21418 ± 980 |
| log g | 5.376 ± 0.095 |
| log n(He)/n(H) | -3.161 ± 0.140 upper limit |
| reduced χ² | 1.003 over 660 points |
| radial velocity | -101.0 km s−1 |
| resolution (FWHM) | 2.00 Å |
| lines fitted | 13 |
| grids | h667.grid h909.grid h97.grid h99.grid +1 more |
| settled | outside the grid |
| fitted | 04/09/2026 18:37:03 |
Observation
| source file | spec-025573-60113-27021599441836796.fits |
Gaia astrometry
| Gaia DR3 source | 6421024765209782400 |
| parallax [mas] | 0.4048 ± 0.0749 |
| G | 17.369 |
| BP − RP | -0.288 |
| Gabs | 5.405 |
| μα [mas/yr] | -0.135 |
| μδ [mas/yr] | -2.843 |
| RUWE | 0.949 |
| l, b | 324.453, -25.777 |
| selection | f_plx |
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -1.64 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -1.46 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -1.38 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -1.34 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -1.31 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -1.29 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -1.28 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -1.27 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| Hκ | 3750.15 | -1.26 | -10.0, 10.0 | 3.9 | -7.4, 8.7 |
| He II 4686 | 4685.70 | -1.58 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -1.51 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -1.36 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -1.66 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |
Spectral energy distribution
Teff 20213 K · log g 5.387 · E(44−55) 0.022 · χ²r 0.17 over 30 bands
distance 2470 pc · parallax 0.4000 ± 0.0700 mas (18%) · R 0.1544 +0.0352 −0.0242 R☉ · M 0.212 +0.114 −0.064 M☉ — below the 0.47 canonical mass · L 3.6 +1.8 −1.0 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.