J17174+3207sdB
SDSSJ171729.94+320718.9 · 17:17:29.95 32:07:18.88 · Culpan knownhsd
χ²/N = 0.98
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] | 31972 ± 500 |
| log g | 5.798 ± 0.073 |
| log n(He)/n(H) | -2.209 ± 0.099 |
| reduced χ² | 0.978 over 638 points |
| radial velocity | -137.0 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 18:32:31 |
Fit — Lei (TLUSTY)
| Teff [K] | 32540 ± 410 |
| log g | 5.760 ± 0.070 |
| log n(He)/n(H) | -2.280 ± 0.160 |
| grids | Lei et al. 2019, ApJ 881, 135 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid |
Observation
| cosmic rays | 6 pixels cancelled |
| S/N (classifier) | 46.1 |
| source file | spec-57897-HD171048N321044M02_sp08-096.fits.gz |
Gaia astrometry
| Gaia DR3 source | 1333535634003198848 |
| parallax [mas] | 0.3088 ± 0.0585 |
| G | 17.207 |
| Gabs | 4.616 |
| μα [mas/yr] | -4.476 |
| μδ [mas/yr] | -0.809 |
| l, b | 55.280, 32.876 |
Published (Culpan et al. 2022)
| class (Culpan) | sdB |
| class (SIMBAD) | DAB |
| Teff [K] | 33295 ± 961 |
| log g | 5.67 ± 0.16 |
| log y | -2.40 ± 0.20 |
| reference | 2017OAst...26..164G |
Classifier
AGREES
fitted Teff 33295 logg 5.67 logY -2.4 2017OAst...26..164G
auto: contrast 0.09, within the 0.27 a subdwarf reaches at 30 kK
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -2.22 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -1.98 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -1.87 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -1.81 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -1.78 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -1.75 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -1.74 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -1.72 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | -2.14 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -2.04 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -1.84 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -2.25 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |