J07022+1217sdB
SDSSJ070215.20+121753.4 · 07:02:15.22 12:17:53.45 · 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] | 25901 ± 173 |
| log g | 5.391 ± 0.027 |
| log n(He)/n(H) | -3.134 ± 0.085 |
| reduced χ² | 0.989 over 657 points |
| radial velocity | -240.0 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 18:28:01 |
Fit — Lei (TLUSTY)
| Teff [K] | 27110 ± 410 |
| log g | 5.410 ± 0.040 |
| log n(He)/n(H) | -3.180 ± 0.100 |
| 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) | 29.8 |
| source file | spec-57377-GAC104N11B1_sp09-130.fits.gz |
Gaia astrometry
| Gaia DR3 source | 3160836861727862400 |
| parallax [mas] | 0.9049 ± 0.0418 |
| G | 14.722 |
| Gabs | 4.577 |
| μα [mas/yr] | 2.337 |
| μδ [mas/yr] | -7.535 |
| l, b | 203.134, 7.941 |
Published (Culpan et al. 2022)
| class (Culpan) | sdB |
| class (SIMBAD) | sd |
| Teff [K] | 26933 ± 355 |
| log g | 5.27 ± 0.04 |
| log y | -3.52 ± 0.10 |
| reference | 2021ApJS..256...28L |
Classifier
AGREES
fitted Teff 26933 logg 5.27 logY -3.52 2021ApJS..256...28L
auto: contrast 0.17, within the 0.34 a subdwarf reaches at 25 kK, Mg I b suggests a companion but Ca II does not (0.2 sigma)
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -3.89 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -3.47 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -3.28 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -3.18 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -3.11 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -3.07 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -3.04 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -3.02 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| Hκ | 3750.15 | -3.00 | -10.0, 10.0 | 3.9 | -7.4, 8.7 |
| He II 4686 | 4685.70 | -3.75 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -3.58 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -3.22 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -3.94 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |