J08251+4840sdB
SDSSJ082508.55+484031.1 · 08:25:08.54 48:40:31.19 · Culpan knownhsd
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
Results and provenance
Fit — Bamberg
| Teff [K] | 29715 ± 520 |
| log g | 5.523 ± 0.073 |
| log n(He)/n(H) | -2.865 ± 0.096 |
| reduced χ² | 0.999 over 637 points |
| radial velocity | -185.0 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 |
| fitted | 04/09/2026 18:29:12 |
Fit — Lei (TLUSTY)
| Teff [K] | 29760 ± 300 |
| log g | 5.620 ± 0.070 |
| log n(He)/n(H) | -2.960 ± 0.330 |
| grids | Lei et al. 2020, ApJ 889, 117 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid |
Observation
| S/N (classifier) | 43.9 |
| source file | spec-58099-HD082820N494114M02_sp05-036.fits.gz |
Gaia astrometry
| Gaia DR3 source | 930960515328049536 |
| parallax [mas] | 0.1570 ± 0.0843 |
| G | 16.949 |
| μα [mas/yr] | 0.257 |
| μδ [mas/yr] | 0.620 |
| l, b | 170.770, 35.175 |
Published (Culpan et al. 2022)
| class (Culpan) | sdB |
| class (SIMBAD) | DAB |
| Teff [K] | 30588 ± 232 |
| log g | 5.53 ± 0.04 |
| log y | -2.76 ± 0.06 |
| reference | 2021ApJS..256...28L |
Classifier
AGREES
fitted Teff 30588 logg 5.53 logY -2.76 2021ApJS..256...28L
auto: contrast 0.13, within the 0.30 a subdwarf reaches at 28 kK, Ca II 8662/8542 = 9.6 -- the star's own Paschen lines, not a companion
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -3.00 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -2.68 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -2.53 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -2.45 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -2.40 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -2.37 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -2.34 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -2.33 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | -2.89 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -2.76 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -2.48 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -3.04 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |