J17039+3415sdB
SDSSJ170356.68+341505.0 · 17:03:56.66 34:15:05.11 · 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] | 27485 ± 518 |
| log g | 5.351 ± 0.085 |
| log n(He)/n(H) | -2.604 ± 0.172 |
| reduced χ² | 0.985 over 660 points |
| radial velocity | -32.0 km s−1 |
| resolution (FWHM) | 2.50 Å |
| lines fitted | 13 |
| grids | HE-0.041.fits HE-0.125.fits HE-0.300.fits HE-0.550.fits +9 more |
| fitted | 04/09/2026 18:32:23 |
Fit — Lei (TLUSTY)
| Teff [K] | 28360 ± 180 |
| log g | 5.340 ± 0.030 |
| log n(He)/n(H) | -2.540 ± 0.120 |
| 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) | 47.2 |
| source file | spec-57869-HD165712N321400M02_sp12-178.fits.gz |
Gaia astrometry
| Gaia DR3 source | 1337803736279119616 |
| parallax [mas] | 0.2838 ± 0.0453 |
| G | 16.698 |
| Gabs | 3.975 |
| μα [mas/yr] | -0.926 |
| μδ [mas/yr] | -6.553 |
| l, b | 57.079, 36.098 |
Published (Culpan et al. 2022)
| class (Culpan) | sdB |
| class (SIMBAD) | sdB |
| Teff [K] | 26652 ± 1254 |
| log g | 5.26 ± 0.18 |
| log y | -2.20 ± 0.20 |
| reference | 2017OAst...26..164G |
Classifier
AGREES
fitted Teff 26652 logg 5.26 logY -2.2 2017OAst...26..164G
auto: contrast 0.19, within the 0.29 a subdwarf reaches at 28 kK, Ca II 8662/8542 = 5.2 -- the star's own Paschen lines, not a companion
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -0.52 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -0.46 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -0.44 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -0.42 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -0.42 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -0.41 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -0.41 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -0.40 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| Hκ | 3750.15 | -0.40 | -10.0, 10.0 | 3.9 | -7.4, 8.7 |
| He II 4686 | 4685.70 | -0.50 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -0.48 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -0.43 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -0.53 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |