J18121+1807sdB
LAMOSTJ181209.99+180754.1 · 18:12:09.98 18:07:54.08 · 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] | 28444 ± 271 |
| log g | 5.411 ± 0.042 |
| log n(He)/n(H) | -2.968 ± 0.147 |
| reduced χ² | 0.982 over 636 points |
| radial velocity | -33.0 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 18:32:52 |
Fit — Lei (TLUSTY)
| Teff [K] | 30170 ± 50 |
| log g | 5.410 ± 0.010 |
| log n(He)/n(H) | -3.080 ± 0.840 |
| grids | Lei et al. 2020, ApJ 889, 117 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid |
Observation
| cosmic rays | 3 pixels cancelled |
| S/N (classifier) | 27.6 |
| source file | spec-58634-GACII273N16B1_sp11-012.fits.gz |
Gaia astrometry
| Gaia DR3 source | 4526347084141410432 |
| parallax [mas] | 0.5316 ± 0.0329 |
| G | 15.467 |
| Gabs | 4.209 |
| μα [mas/yr] | -2.503 |
| μδ [mas/yr] | -9.545 |
| l, b | 45.168, 16.626 |
Published (Culpan et al. 2022)
| class (Culpan) | sdB |
| Teff [K] | 29896 ± 314 |
| log g | 5.37 ± 0.05 |
| log y | -2.97 ± 0.08 |
| reference | 2021ApJS..256...28L |
Classifier
AGREES
fitted Teff 29896 logg 5.37 logY -2.97 2021ApJS..256...28L
auto: contrast 0.15, within the 0.31 a subdwarf reaches at 27 kK, possible composite (4.3 sigma) -- worth an SED
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -0.54 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -0.48 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -0.45 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -0.44 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -0.43 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -0.42 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -0.42 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -0.42 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | -0.52 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -0.49 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -0.44 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -0.54 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |