J17083+3001sdOB

PG1706+301 · 17:08:22.68 30:01:36.34 · 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

Observed spectrum in black, model in red, offset by line. Balmer series left, helium right.

Line-profile fit — uli

Observed spectrum in black, model in red, offset by line. Balmer series left, helium right.

Results and provenance

Fit — Bamberg

T_eff [K]	36776 ± 192
log g	6.158 ± 0.027
log n(He)/n(H)	-1.652 ± 0.039
reduced χ²	1.004 over 640 points
radial velocity	36.0 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 19:09:52

Fit — uli

T_eff [K]	35905 ± 164
log g	6.075 ± 0.029
log n(He)/n(H)	-1.602 ± 0.042
reduced χ²	0.994 over 640 points
radial velocity	36.0 km s⁻¹
resolution (FWHM)	2.00 Å
lines fitted	12
grids	h667.grid h909.grid h97.grid h99.grid +1 more
settled	outside the grid
fitted	04/09/2026 18:36:37

Observation

telescope	SDSS 2.5-M
survey / programme	boss
date	2011-06-26
exposure	7206 s in 16
pipeline	v5_13_2
S/N (classifier)	77.3
source file	spec-4997-55738-0252.fits

Gaia astrometry

Gaia DR3 source	1309190183117130240
parallax [mas]	0.6490 ± 0.0370
G	15.913
G_abs	4.983
μ_α [mas/yr]	-2.766
μ_δ [mas/yr]	-10.260
l, b	52.277, 34.272

Published (Culpan et al. 2022)

class (Culpan)	sdOB
class (SIMBAD)	sdBO
T_eff [K]	36453 ± 833
log g	6.07 ± 0.10
log y	-1.92 ± 0.31
reference	2019MNRAS.486.2169K

Classifier

AGREES

fitted Teff 36453 logg 6.07 logY -1.92 2019MNRAS.486.2169K

auto: He II 0.39 (4.7 sigma), 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
H_β	4861.32	0.58	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	0.52	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	0.49	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	0.48	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	0.47	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	0.46	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	0.46	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	0.45	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	0.56	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	0.54	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	0.48	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	0.59	-15.0, 15.0	5.1	-15.0, 15.0

Spectral energy distribution

T_eff 36776 K · log g 6.158 · E(44−55) 0.068 · χ²_r 0.26 over 38 bands

distance 1541 pc · parallax 0.6500 ± 0.0400 mas (6%) · R 0.1158 +0.0072 −0.0064 R☉ · M 0.705 +0.127 −0.106 M☉ — above the 0.47 canonical mass · L 22.1 +2.9 −2.4 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.