J20227+0717

SDSSJ202242.30+071715.2 · 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]	28150 ± 423
log g	5.474 ± 0.065
log n(He)/n(H)	-3.101 ± 0.341
reduced χ²	0.992 over 641 points
radial velocity	-64.0 km s⁻¹
resolution (FWHM)	2.50 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 18:33:15

Fit — Lei (TLUSTY)

T_eff [K]	29270 ± 130
log g	5.420 ± 0.030
log n(He)/n(H)	-3.100 ± 0.140
grids	Lei et al. 2020, ApJ 889, 117 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

source file

spec-58017-GACII305N07M1_sp04-110.fits.gz

Gaia astrometry

Gaia DR3 source	4249937660575808000
parallax [mas]	0.0364 ± 0.0781
G	17.041
μ_α [mas/yr]	-0.989
μ_δ [mas/yr]	-2.431
l, b	50.433, -16.529

Published (Culpan et al. 2022)

class (Culpan)	sdB
T_eff [K]	29088 ± 372
log g	5.42 ± 0.06
log y	-3.13 ± 0.14
reference	2021ApJS..256...28L

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-1.04	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-0.93	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-0.88	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-0.85	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-0.83	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-0.82	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-0.81	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-0.80	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-1.00	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	-0.95	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-0.86	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-1.05	-15.0, 15.0	5.1	-15.0, 15.0