J02043+2927
LAMOSTJ020420.23+292734.8 · Culpan knownhsd
outside the grid 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] | 27968 ± 573 |
| log g | 5.847 ± 0.082 |
| log n(He)/n(H) | -6.229 ± 1.099 upper limit |
| reduced χ² | 0.988 over 636 points |
| radial velocity | -78.0 km s−1 |
| resolution (FWHM) | 2.50 Å |
| lines fitted | 12 |
| grids | HE-0.041.fits HE-0.125.fits HE-0.300.fits HE-0.550.fits +9 more |
| settled | outside the grid |
| fitted | 04/09/2026 18:25:44 |
Fit — Lei (TLUSTY)
| Teff [K] | 29590 ± 60 |
| log g | 5.650 ± 0.020 |
| log n(He)/n(H) | -3.000 ± 0.000 |
| grids | Lei et al. 2019, ApJ 881, 135 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid |
| helium | published as a limit |
Observation
| source file | spec-57030-M31028N29B2_sp13-054.fits.gz |
Gaia astrometry
| Gaia DR3 source | 300019923940638336 |
| parallax [mas] | 0.6621 ± 0.0662 |
| G | 16.169 |
| Gabs | 5.306 |
| μα [mas/yr] | 4.450 |
| μδ [mas/yr] | -3.201 |
| l, b | 141.411, -30.783 |
Published (Culpan et al. 2022)
| class (Culpan) | sdOB |
| Teff [K] | 30083 ± 149 |
| log g | 5.95 ± 0.04 |
| log y | -3.87 ± 0.26 |
| reference | 2021ApJS..256...28L |
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -1.26 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -1.13 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -1.07 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -1.03 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -1.01 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -1.00 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -0.99 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -0.98 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | -1.22 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -1.16 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -1.05 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -1.28 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |