J17041+2935sdB
SDSSJ170411.22+293546.7 · 17:04:11.21 29:35:46.72 · 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] | 29169 ± 395 |
| log g | 5.609 ± 0.061 |
| log n(He)/n(H) | -2.738 ± 0.172 |
| reduced χ² | 0.991 over 637 points |
| radial velocity | 28.0 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 18:32:25 |
Fit — Lei (TLUSTY)
| Teff [K] | 30660 ± 350 |
| log g | 5.530 ± 0.050 |
| log n(He)/n(H) | -2.630 ± 0.140 |
| grids | Lei et al. 2019, ApJ 881, 135 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid |
Observation
| cosmic rays | 3 pixels cancelled |
| S/N (classifier) | 46.0 |
| source file | spec-57162-HD170537N293723M01_sp04-165.fits.gz |
Gaia astrometry
| Gaia DR3 source | 1308836793208539264 |
| parallax [mas] | 0.1895 ± 0.0587 |
| G | 17.133 |
| μα [mas/yr] | -4.615 |
| μδ [mas/yr] | -11.747 |
| l, b | 51.501, 35.049 |
Published (Culpan et al. 2022)
| class (Culpan) | sdB |
| class (SIMBAD) | DAB |
| Teff [K] | 29506 ± 1050 |
| log g | 5.54 ± 0.16 |
| log y | -2.50 ± 0.20 |
| reference | 2017OAst...26..164G |
Classifier
AGREES
fitted Teff 29506 logg 5.54 logY -2.5 2017OAst...26..164G
auto: contrast 0.12, within the 0.29 a subdwarf reaches at 29 kK, Mg I b suggests a companion but Ca II does not (0.3 sigma)
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | 0.45 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | 0.41 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | 0.38 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | 0.37 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | 0.36 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | 0.36 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | 0.35 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | 0.35 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | 0.44 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | 0.42 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | 0.38 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | 0.46 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |