J17290+1719sdB
LAMOSTJ172903.19+171937.0 · 17:29:03.19 17:19:37.02 · Culpan knownhsd
χ²/N = 1.01
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] | 38425 ± 1383 |
| log g | 5.327 ± 0.136 |
| log n(He)/n(H) | -2.503 ± 0.410 |
| reduced χ² | 1.013 over 639 points |
| radial velocity | -73.0 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 18:32:36 |
Fit — Lei (TLUSTY)
| Teff [K] | 37750 ± 660 |
| log g | 5.170 ± 0.080 |
| log n(He)/n(H) | -2.650 ± 0.190 |
| grids | Lei et al. 2020, ApJ 889, 117 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid |
Observation
| cosmic rays | 6 pixels cancelled |
| S/N (classifier) | 26.3 |
| source file | spec-58604-GACII261N16M1_sp09-223.fits.gz |
Gaia astrometry
| Gaia DR3 source | 4550175420961718528 |
| parallax [mas] | 0.3076 ± 0.0456 |
| G | 16.284 |
| Gabs | 3.699 |
| μα [mas/yr] | -0.673 |
| μδ [mas/yr] | -1.315 |
| l, b | 40.072, 25.765 |
Published (Culpan et al. 2022)
| class (Culpan) | sdOB |
| Teff [K] | 41110 ± 672 |
| log g | 5.76 ± 0.08 |
| log y | -2.70 ± 0.20 |
| reference | 2021ApJS..256...28L |
Classifier
DISPUTED
fitted Teff 41110 logg 5.76 logY -2.7 2021ApJS..256...28L
auto: contrast 0.06, within the 0.25 a subdwarf reaches at 32 kK, Mg I b suggests a companion but Ca II does not (0.6 sigma)
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -1.18 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -1.06 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -1.00 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -0.97 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -0.95 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -0.93 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -0.92 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -0.92 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | -1.14 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -1.09 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -0.98 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -1.20 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |