J20551+0252
PG2052+027 · Culpan knownhsd
χ²/N = 0.99
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
Results and provenance
Fit — Bamberg
| Teff [K] | 52509 ± 1445 |
| log g | 5.866 ± 0.171 |
| log n(He)/n(H) | 0.406 ± 0.163 |
| reduced χ² | 0.987 over 750 points |
| radial velocity | 248.0 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 19:10:37 |
Observation
| cosmic rays | 3 pixels cancelled |
| source file | spec-101061-59866-27021598874739386.fits |
Gaia astrometry
| Gaia DR3 source | 1730983351999762944 |
| parallax [mas] | 0.2401 ± 0.0599 |
| G | 16.121 |
| μα [mas/yr] | 0.760 |
| μδ [mas/yr] | -11.986 |
| l, b | 50.943, -25.720 |
Published (Culpan et al. 2022)
| class (Culpan) | sdOB |
| class (SIMBAD) | sdOHe |
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | 4.02 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | 3.59 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | 3.39 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | 3.28 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | 3.22 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | 3.17 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | 3.14 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | 3.12 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | 3.88 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He II 5412 | 5411.52 | 4.48 | -15.0, 15.0 | 5.6 | -15.0, 15.0 |
| He II 4542 | 4541.59 | 3.76 | -15.0, 20.0 | 4.7 | -20.0, 20.0 |
| He II 4200 | 4199.84 | 3.47 | -23.5, 33.8 | 4.3 | -20.0, 20.0 |
| He I 4472 | 4471.60 | 3.70 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | 3.33 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | 4.07 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |
Spectral energy distribution
Teff 52509 K · log g 5.866 · E(44−55) 0.118 · χ²r 0.10 over 36 bands
distance 4165 pc · parallax 0.2400 ± 0.0600 mas (25%) · R 0.2470 +0.0827 −0.0492 R☉ · M 1.636 +1.321 −0.603 M☉ — above the 0.47 canonical mass · L 418.3 +326.1 −150.6 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.