J13401+4751sdB
PG1338+481 · 13:40:08.83 47:51:51.84 · 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] | 27055 ± 261 |
| log g | 5.506 ± 0.041 |
| log n(He)/n(H) | -2.794 ± 0.074 |
| reduced χ² | 0.985 over 637 points |
| radial velocity | -86.0 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 18:31:03 |
Fit — Lei (TLUSTY)
| Teff [K] | 28480 ± 230 |
| log g | 5.400 ± 0.030 |
| log n(He)/n(H) | -2.700 ± 0.100 |
| grids | Lei et al. 2018, ApJ 868, 70 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid |
Observation
| S/N (classifier) | 31.7 |
| source file | spec-56394-HD132901N475049B01_sp13-093.fits.gz |
Gaia astrometry
| Gaia DR3 source | 1552221800914196480 |
| parallax [mas] | 1.2181 ± 0.0305 |
| G | 13.566 |
| Gabs | 4.018 |
| μα [mas/yr] | 8.308 |
| μδ [mas/yr] | -9.896 |
| l, b | 101.523, 67.189 |
Published (Culpan et al. 2022)
| class (Culpan) | sdB |
| class (SIMBAD) | sdB |
| Teff [K] | 29109 ± 205 |
| log g | 5.46 ± 0.03 |
| log y | -2.79 ± 0.04 |
| reference | 2021ApJS..256...28L |
Classifier
AGREES
fitted Teff 29109 logg 5.46 logY -2.79 2021ApJS..256...28L
auto: contrast 0.13, within the 0.35 a subdwarf reaches at 24 kK, Ca II 8662/8542 = 9.7 -- the star's own Paschen lines, not a companion
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -1.39 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -1.25 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -1.18 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -1.14 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -1.12 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -1.10 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -1.09 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -1.08 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | -1.34 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -1.28 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -1.16 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -1.41 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |