J16295+0031sdB
PG1627+006 · 16:29:35.90 00:31:49.12 · Culpan knownhsd
χ²/N = 0.99
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
Line-profile fit — uli
Results and provenance
Fit — Bamberg
| Teff [K] | 24637 ± 234 |
| log g | 5.613 ± 0.030 |
| log n(He)/n(H) | -2.891 ± 0.092 |
| reduced χ² | 0.985 over 659 points |
| radial velocity | -131.0 km s−1 |
| resolution (FWHM) | 2.00 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 19:09:43 |
Fit — uli
| Teff [K] | 24456 ± 256 |
| log g | 5.508 ± 0.032 |
| log n(He)/n(H) | -2.892 ± 0.068 |
| reduced χ² | 0.984 over 659 points |
| radial velocity | -131.0 km s−1 |
| resolution (FWHM) | 2.00 Å |
| lines fitted | 13 |
| grids | h909.grid h97.grid h99.grid h999.grid |
| fitted | 04/09/2026 18:36:30 |
Observation
| telescope | SDSS 2.5-M |
| survey / programme | MWM / MWM3 |
| field · MJD | 015275 · 59391 |
| date | 2021-06-20 |
| catalogid | 5172748701 |
| exposure | 4500 s in 5 |
| airmass | 1.23 |
| seeing (50%) | 1.90″ |
| E(B−V) | 0.076 |
| pipeline | v6_2_1 |
| cosmic rays | 7 pixels cancelled |
| S/N (classifier) | 61.3 |
| source file | spec-015275-59391-5172748701.fits |
Gaia astrometry
| Gaia DR3 source | 4431621992740777088 |
| parallax [mas] | 0.9048 ± 0.0401 |
| G | 14.957 |
| BP − RP | -0.306 |
| Gabs | 4.794 |
| μα [mas/yr] | -1.783 |
| μδ [mas/yr] | -3.366 |
| l, b | 15.465, 31.366 |
Published (Culpan et al. 2022)
| class (Culpan) | sdB |
| class (SIMBAD) | sdB2.5VIIeHe3 |
| Teff [K] | 24696 ± 698 |
| log g | 5.28 ± 0.08 |
| log y | -3.46 ± 0.40 |
| reference | 2021ApJS..256...28L |
Classifier
AGREES
fitted Teff 24696 logg 5.28 logY -3.46 2021ApJS..256...28L
auto: contrast 0.16, within the 0.33 a subdwarf reaches at 26 kK, Mg I b suggests a companion but Ca II does not (0.7 sigma)
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -2.12 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -1.90 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -1.79 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -1.73 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -1.70 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -1.68 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -1.66 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -1.65 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| Hκ | 3750.15 | -1.64 | -10.0, 10.0 | 3.9 | -7.4, 8.7 |
| He II 4686 | 4685.70 | -2.05 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -1.95 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -1.76 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -2.15 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |
Spectral energy distribution
Teff 24637 K · log g 5.613 · E(44−55) 0.090 · χ²r 0.35 over 41 bands
distance 1105 pc · parallax 0.9000 ± 0.0400 mas (4%) · R 0.1947 +0.0093 −0.0086 R☉ · M 0.568 +0.090 −0.078 M☉ — above the 0.47 canonical mass · L 12.6 +1.3 −1.2 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.