J17080+8205sdO

GALEXJ17080+8205 · 17:08:01.58 82:05:53.30 · Culpan knownhsd

outside the grid χ²/N = 0.96

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]	58477 ± 472
log g	5.812 ± 0.127
log n(He)/n(H)	0.303 ± 0.110
reduced χ²	0.962 over 747 points
radial velocity	103.0 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
settled	outside the grid
fitted	04/09/2026 19:09:52

Observation

telescope	SDSS 2.5-M
survey / programme	MWM / mwm_cb
field · MJD	102102 · 59658
date	2022-03-20
catalogid	27021597906895735
exposure	3600 s in 4
airmass	1.77
seeing (50%)	1.89″
E(B−V)	0.101
pipeline	v6_2_1
cosmic rays	12 pixels cancelled
S/N (classifier)	57.1
source file	spec-102102-59658-27021597906895735.fits

Gaia astrometry

Gaia DR3 source	1710904418546053632
parallax [mas]	0.3684 ± 0.0268
G	14.804
BP − RP	-0.383
G_abs	2.659
μ_α [mas/yr]	-8.243
μ_δ [mas/yr]	-2.209
l, b	114.691, 30.332

Published (Culpan et al. 2022)

class (Culpan)	He-sdO
class (SIMBAD)	sdOHe

Classifier

DISPUTED

auto: He II/He I 14.3, EW 2.14, Mg I b suggests a companion but Ca II does not (-0.9 sigma)

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	1.67	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	1.49	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	1.41	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	1.36	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	1.34	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	1.32	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	1.30	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	1.30	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	1.61	-11.9, 11.9	4.9	-15.0, 13.8
He II 5412	5411.52	1.86	-15.0, 15.0	5.6	-15.0, 15.0
He II 4542	4541.59	1.56	-15.0, 20.0	4.7	-20.0, 20.0
He II 4200	4199.84	1.44	-23.5, 33.8	4.3	-20.0, 20.0
He I 4472	4471.60	1.54	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	1.38	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	1.69	-15.0, 15.0	5.1	-15.0, 15.0