J07107+6655sdB
HS0705+6700 · 07:10:42.05 66:55:43.54 · Culpan knownhsd
χ²/N = 1.01
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] | 28009 ± 584 |
| log g | 5.570 ± 0.101 |
| log n(He)/n(H) | -2.427 ± 0.113 |
| reduced χ² | 1.011 over 639 points |
| radial velocity | -59.0 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 19:07:34 |
Fit — uli
| Teff [K] | 28575 ± 686 |
| log g | 5.473 ± 0.103 |
| log n(He)/n(H) | -2.425 ± 0.121 |
| reduced χ² | 1.010 over 639 points |
| radial velocity | -59.0 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 18:34:46 |
Observation
| telescope | SDSS 2.5-M |
| survey / programme | MWM / mwm_cb |
| field · MJD | 102983 · 59952 |
| date | 2023-01-08 |
| catalogid | 27021597913228689 |
| exposure | 900 s in 1 |
| airmass | 1.23 |
| seeing (50%) | 1.10″ |
| E(B−V) | 0.052 |
| pipeline | v6_2_1 |
| S/N (classifier) | 22.8 |
| source file | spec-102983-59952-27021597913228689.fits |
Gaia astrometry
| Gaia DR3 source | 1102107819544067456 |
| parallax [mas] | 0.7895 ± 0.0321 |
| G | 14.616 |
| BP − RP | -0.344 |
| Gabs | 4.143 |
| μα [mas/yr] | -0.454 |
| μδ [mas/yr] | -7.705 |
| l, b | 148.843, 26.666 |
Published (Culpan et al. 2022)
| class (Culpan) | sdB+dM |
| class (SIMBAD) | sdB+dM |
| Teff [K] | 30200 ± 1000 |
| log g | 5.70 ± 0.20 |
| log y | -2.60 ± 0.30 |
| reference | 2003A&A...400..939E |
Classifier
AGREES
fitted Teff 30200 logg 5.7 logY -2.6 2003A&A...400..939E
auto: contrast 0.17, within the 0.34 a subdwarf reaches at 25 kK, Ca II 8662/8542 = 6.2 -- the star's own Paschen lines, not a companion; CONTINUUM WAVY (0.030, typical 0.008) -- Balmer jump and continuum shape unreliable
Fitted lines
| line | λ [Å] | shift [Å] | continuum at | ±avg | fitted over |
| Hβ | 4861.32 | -0.96 | -40.0, 40.0 | 5.0 | -45.0, 45.0 |
| Hγ | 4340.46 | -0.85 | -40.0, 36.8 | 4.5 | -43.0, 43.0 |
| Hδ | 4101.73 | -0.81 | -40.0, 31.6 | 4.2 | -43.0, 43.0 |
| Hε | 3970.07 | -0.78 | -28.0, 30.0 | 4.1 | -30.0, 35.0 |
| Hζ | 3889.05 | -0.77 | -20.0, 26.2 | 4.0 | -31.8, 32.0 |
| Hη | 3835.38 | -0.75 | -20.0, 14.6 | 4.0 | -20.7, 21.8 |
| Hθ | 3797.90 | -0.75 | -16.0, 16.0 | 3.9 | -15.6, 16.7 |
| Hι | 3770.63 | -0.74 | -13.0, 13.0 | 3.9 | -11.7, 11.6 |
| He II 4686 | 4685.70 | -0.92 | -11.9, 11.9 | 4.9 | -15.0, 13.8 |
| He I 4472 | 4471.60 | -0.88 | -15.0, 15.0 | 4.6 | -15.0, 15.0 |
| He I 4026 | 4026.29 | -0.79 | -24.2, 15.0 | 4.2 | -15.0, 15.0 |
| He I 4922 | 4921.93 | -0.97 | -15.0, 15.0 | 5.1 | -15.0, 15.0 |
Spectral energy distribution
Teff 28009 K · log g 5.570 · E(44−55) 0.090 · χ²r 0.28 over 37 bands
distance 1267 pc · parallax 0.7900 ± 0.0300 mas (4%) · R 0.2319 +0.0103 −0.0095 R☉ · M 0.729 +0.113 −0.098 M☉ — above the 0.47 canonical mass · L 29.8 +2.9 −2.5 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.