J08080+1208sdB

SDSSJ080801.40+120826.9 · 08:08:01.42 12:08:27.10 · 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]	36068 ± 254
log g	5.996 ± 0.031
log n(He)/n(H)	-1.859 ± 0.057
reduced χ²	0.998 over 639 points
radial velocity	-176.0 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 19:07:48

Fit — uli

T_eff [K]	33640 ± 327
log g	5.975 ± 0.029
log n(He)/n(H)	-1.861 ± 0.040
reduced χ²	1.002 over 639 points
radial velocity	-176.0 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 18:34:55

Observation

telescope	SDSS 2.5-M
survey / programme	boss
date	2011-02-11
exposure	7207 s in 16
pipeline	v5_13_2
S/N (classifier)	72.9
source file	spec-4505-55603-0168.fits

Gaia astrometry

Gaia DR3 source	649989153600135680
parallax [mas]	0.5030 ± 0.0680
G	16.288
G_abs	4.819
μ_α [mas/yr]	-0.332
μ_δ [mas/yr]	-5.745
l, b	210.392, 22.413

Published (Culpan et al. 2022)

class (Culpan)	sdOB
class (SIMBAD)	DAO/sdO

Classifier

DISPUTED

auto: contrast 0.04, within the 0.25 a subdwarf reaches at 32 kK

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-2.85	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-2.55	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-2.41	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-2.33	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-2.28	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-2.25	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-2.23	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-2.21	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-2.75	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	-2.63	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-2.36	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-2.89	-15.0, 15.0	5.1	-15.0, 15.0

Spectral energy distribution

T_eff 36068 K · log g 5.996 · E(44−55) 0.038 · χ²_r 0.12 over 34 bands

distance 1988 pc · parallax 0.5000 ± 0.0700 mas (14%) · R 0.1228 +0.0193 −0.0147 R☉ · M 0.546 +0.203 −0.135 M☉ · L 23.0 +7.8 −5.2 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.