J17026+3125

PG1700+315 · 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

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

Results and provenance

Fit — Bamberg

T_eff [K]	44967 ± 854
log g	4.624 ± 0.067
log n(He)/n(H)	-1.051 ± 0.064
reduced χ²	0.988 over 747 points
radial velocity	4.0 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 19:09:49

Observation

source file

spec-4992-55723-0093.fits

Gaia astrometry

Gaia DR3 source	1310316147447722112
parallax [mas]	0.1035 ± 0.0646
G	16.989
μ_α [mas/yr]	-1.568
μ_δ [mas/yr]	-0.711
l, b	53.590, 35.783

Published (Culpan et al. 2022)

class (Culpan)	sdOB
class (SIMBAD)	sdO
T_eff [K]	46418 ± 598
log g	5.32 ± 0.07
log y	-1.19 ± 0.06
reference	2021ApJS..256...28L

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	0.06	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	0.06	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	0.05	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	0.05	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	0.05	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	0.05	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	0.05	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	0.05	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	0.06	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	0.07	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	0.06	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	0.06	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	0.06	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	0.05	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	0.07	-15.0, 15.0	5.1	-15.0, 15.0

Spectral energy distribution

T_eff 44967 K · log g 4.624 · E(44−55) 0.042 · χ²_r 0.17 over 29 bands

distance 9662 pc · parallax 0.1000 ± 0.0600 mas (60%) · R 0.3533 +0.4028 −0.1291 R☉ · M 0.192 +0.692 −0.115 M☉ · L 459.8 +1644.8 −274.8 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.