J23577+2426sdO
PG2355+242 · 23:57:45.41 24:26:22.49 · Culpan knownhsd
χ²/N = 1.00
Spectrum
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] | 53596 ± 885 |
| log g | 6.108 ± 0.049 |
| log n(He)/n(H) | -1.679 ± 0.064 |
| reduced χ² | 0.998 over 745 points |
| radial velocity | -96.0 km s−1 |
| resolution (FWHM) | 2.00 Å |
| lines fitted | 15 |
| grids | HE-0.041.fits HE-0.125.fits HE-0.300.fits HE-0.550.fits +9 more |
| fitted | 04/09/2026 19:11:07 |
Observation
| telescope | SDSS 2.5-M |
| survey / programme | boss |
| date | 2013-09-08 |
| exposure | 3600 s in 8 |
| pipeline | v5_13_2 |
| S/N (classifier) | 52.3 |
| source file | spec-6513-56543-0296.fits |
Gaia astrometry
| Gaia DR3 source | 2851511427281425536 |
| parallax [mas] | 0.4016 ± 0.0662 |
| G | 16.331 |
| Gabs | 4.385 |
| μα [mas/yr] | -1.730 |
| μδ [mas/yr] | -8.602 |
| l, b | 107.625, -36.831 |
Published (Culpan et al. 2022)
| class (Culpan) | sdOB |
| class (SIMBAD) | sdOB |
| Teff [K] | 58136 ± 1454 |
| log g | 5.74 ± 0.07 |
| log y | -1.76 ± 0.14 |
| reference | 2021ApJS..256...28L |
Classifier
DISPUTED
fitted Teff 58136 logg 5.74 logY -1.76 2021ApJS..256...28L
auto: He II/He I 7.9, EW 1.19, Mg I b suggests a companion but Ca II does not (0.1 sigma)
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -1.56 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -1.39 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -1.31 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -1.27 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -1.25 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -1.23 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -1.22 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -1.21 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | -1.50 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He II 5412 | 5411.52 | -1.73 | -15.0, 15.0 | 5.6 | -15.0, 15.0 |
| He II 4542 | 4541.59 | -1.45 | -15.0, 20.0 | 4.7 | -20.0, 20.0 |
| He II 4200 | 4199.84 | -1.34 | -23.5, 33.8 | 4.3 | -20.0, 20.0 |
| He I 4472 | 4471.60 | -1.43 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -1.29 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -1.58 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |
Spectral energy distribution
Teff 53596 K · log g 6.108 · E(44−55) 0.150 · χ²r 0.20 over 32 bands
distance 2490 pc · parallax 0.4000 ± 0.0700 mas (18%) · R 0.1364 +0.0271 −0.0193 R☉ · M 0.872 +0.405 −0.245 M☉ — above the 0.47 canonical mass · L 138.4 +60.5 −36.6 L☉
Photometry against the model, with the residual beneath it in units of the error. The horizontal bar on each point is the passband, not an error; a hollow point was not fitted and the tooltip says why. Drag a box to zoom, double-click or Esc to come back out.