J07370+2256
SDSSJ073701.45+225637.6 · 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
Line-profile fit — uli
Results and provenance
Fit — Bamberg
| Teff [K] | 27242 ± 156 |
| log g | 5.600 ± 0.027 |
| log n(He)/n(H) | -2.917 ± 0.154 |
| reduced χ² | 0.990 over 639 points |
| radial velocity | -105.0 km s−1 |
| resolution (FWHM) | 2.00 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 19:07:37 |
Fit — uli
| Teff [K] | 27611 ± 222 |
| log g | 5.506 ± 0.029 |
| log n(He)/n(H) | -2.925 ± 0.115 |
| reduced χ² | 0.991 over 639 points |
| radial velocity | -105.0 km s−1 |
| resolution (FWHM) | 2.00 Å |
| lines fitted | 12 |
| grids | h667.grid h909.grid h97.grid h99.grid +1 more |
| fitted | 04/09/2026 18:34:48 |
Observation
| source file | spec-4470-55587-0464.fits |
Gaia astrometry
| Gaia DR3 source | 865746217238417792 |
| parallax [mas] | 0.2829 ± 0.0721 |
| G | 16.738 |
| μα [mas/yr] | -0.127 |
| μδ [mas/yr] | -1.005 |
| l, b | 196.632, 19.859 |
Published (Culpan et al. 2022)
| class (Culpan) | sdB |
| class (SIMBAD) | sdB |
| Teff [K] | 28100 ± 300 |
| log g | 5.45 ± 0.04 |
| log y | -3.00 ± 0.00 |
| reference | 2015A&A...577A..26G |
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -1.70 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -1.52 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -1.44 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -1.39 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -1.36 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -1.34 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -1.33 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -1.32 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | -1.64 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -1.57 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -1.41 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -1.72 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |
Spectral energy distribution
Teff 27242 K · log g 5.600 · E(44−55) 0.042 · χ²r 0.21 over 34 bands
distance 3535 pc · parallax 0.2800 ± 0.0700 mas (25%) · R 0.2313 +0.0797 −0.0468 R☉ · M 0.778 +0.647 −0.291 M☉ — above the 0.47 canonical mass · L 26.6 +21.5 −9.7 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.