J08155+2452sdB
SDSSJ081531.20+245222.6 · 08:15:31.20 24:52:22.62 · Culpan knownhsd
χ²/N = 1.01
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] | 38264 ± 616 |
| log g | 5.686 ± 0.060 |
| log n(He)/n(H) | -3.406 ± 0.437 |
| reduced χ² | 1.014 over 639 points |
| radial velocity | -162.0 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 18:29:05 |
Fit — Lei (TLUSTY)
| Teff [K] | 35360 ± 670 |
| log g | 5.550 ± 0.100 |
| 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
| cosmic rays | 6 pixels cancelled |
| S/N (classifier) | 61.7 |
| source file | spec-57399-GAC122N25M1_sp06-240.fits.gz |
Gaia astrometry
| Gaia DR3 source | 682305655764689408 |
| parallax [mas] | 0.4464 ± 0.0673 |
| G | 16.329 |
| Gabs | 4.588 |
| μα [mas/yr] | -0.611 |
| μδ [mas/yr] | -0.343 |
| l, b | 197.993, 28.778 |
Published (Culpan et al. 2022)
| class (Culpan) | sdOB |
| class (SIMBAD) | sd |
| Teff [K] | 38848 ± 244 |
| log g | 5.85 ± 0.04 |
| log y | -3.28 ± 0.23 |
| reference | 2021ApJS..256...28L |
Classifier
DISPUTED
fitted Teff 38848 logg 5.85 logY -3.28 2021ApJS..256...28L
auto: contrast 0.06, within the 0.22 a subdwarf reaches at 34 kK, possible composite (3.1 sigma) -- worth an SED
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -2.63 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -2.35 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -2.22 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -2.15 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -2.10 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -2.07 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -2.05 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -2.04 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | -2.53 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -2.42 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -2.18 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -2.66 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |