J04559+4619sdB
LAMOSTJ045557.69+461907.9 · 04:55:57.69 46:19:07.90 · Culpan knownhsd
χ²/N = 1.00
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] | 26939 ± 518 |
| log g | 5.583 ± 0.089 |
| log n(He)/n(H) | -2.576 ± 0.185 |
| reduced χ² | 1.001 over 658 points |
| radial velocity | -236.0 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 18:26:45 |
Fit — Lei (TLUSTY)
| Teff [K] | 27250 ± 430 |
| log g | 5.450 ± 0.040 |
| log n(He)/n(H) | -2.730 ± 0.230 |
| grids | Lei et al. 2018, ApJ 868, 70 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid |
Observation
| S/N (classifier) | 24.5 |
| source file | spec-57300-GAC073N44B1_sp11-218.fits.gz |
Gaia astrometry
| Gaia DR3 source | 254631847728048384 |
| parallax [mas] | 0.8931 ± 0.0358 |
| G | 15.693 |
| Gabs | 5.536 |
| μα [mas/yr] | 4.507 |
| μδ [mas/yr] | -0.692 |
| l, b | 160.171, 1.891 |
Published (Culpan et al. 2022)
| class (Culpan) | sdB |
| Teff [K] | 30041 ± 243 |
| log g | 5.78 ± 0.05 |
| log y | -2.75 ± 0.08 |
| reference | 2021ApJS..256...28L |
Classifier
AGREES
fitted Teff 30041 logg 5.78 logY -2.75 2021ApJS..256...28L
auto: contrast 0.14, within the 0.34 a subdwarf reaches at 25 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 | -3.83 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -3.42 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -3.23 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -3.13 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -3.06 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -3.02 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -2.99 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -2.97 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| Hκ | 3750.15 | -2.95 | -10.0, 10.0 | 3.9 | -7.4, 8.7 |
| He II 4686 | 4685.70 | -3.69 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -3.52 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -3.17 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -3.87 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |