J15387+0934iHe-sdOB+cool
PG1536+097 · 15:38:42.86 09:34:42.35 · 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] | 37564 ± 496 |
| log g | 5.736 ± 0.088 |
| log n(He)/n(H) | -0.900 ± 0.074 |
| reduced χ² | 1.001 over 639 points |
| radial velocity | 42.0 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 18:31:48 |
Fit — Lei (TLUSTY)
| Teff [K] | 35840 ± 110 |
| log g | 5.620 ± 0.030 |
| log n(He)/n(H) | -0.930 ± 0.040 |
| grids | Lei et al. 2020, ApJ 889, 117 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid |
Observation
| S/N (classifier) | 50.6 |
| source file | spec-57869-HD153553N111556M01_sp07-040.fits.gz |
Gaia astrometry
| Gaia DR3 source | 1165071009310870912 |
| parallax [mas] | 0.4199 ± 0.0405 |
| G | 15.708 |
| Gabs | 3.972 |
| μα [mas/yr] | -32.626 |
| μδ [mas/yr] | -32.685 |
| l, b | 17.055, 46.878 |
Published (Culpan et al. 2022)
| class (Culpan) | He-sdOB+MS |
| class (SIMBAD) | sdB+K0 |
| Teff [K] | 35114 ± 0 |
| log g | 5.83 ± 0.00 |
| log y | -0.82 ± 0.00 |
| reference | 2005A&A...430..223L |
Classifier
DISPUTED
fitted Teff 35114 logg 5.83 logY -0.82 2005A&A...430..223L
auto: helium intermediate, He I/H-beta depth 0.67 -> log(He/H) about -0.9, He II/He I 0.67, cool companion 7.8 sigma
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | 0.68 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | 0.61 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | 0.57 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | 0.56 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | 0.54 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | 0.54 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | 0.53 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | 0.53 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | 0.66 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | 0.63 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | 0.56 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | 0.69 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |