J07020+1340

SDSSJ070205.53+134025.0 · 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.

Results and provenance

Fit — Bamberg

T_eff [K]	30496 ± 528
log g	5.914 ± 0.087
log n(He)/n(H)	-1.733 ± 0.115
reduced χ²	1.001 over 637 points
radial velocity	-183.0 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 18:28:01

Fit — Lei (TLUSTY)

T_eff [K]	31610 ± 160
log g	5.760 ± 0.050
log n(He)/n(H)	-1.810 ± 0.070
grids	Lei et al. 2019, ApJ 881, 135 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

source file

spec-57428-GAC105N15M1_sp01-101.fits.gz

Gaia astrometry

Gaia DR3 source	3353521803431070464
parallax [mas]	0.3752 ± 0.0880
G	17.098
μ_α [mas/yr]	1.252
μ_δ [mas/yr]	-0.285
l, b	201.868, 8.510

Published (Culpan et al. 2022)

class (Culpan)	sdB
T_eff [K]	31884 ± 151
log g	5.63 ± 0.04
log y	-1.85 ± 0.03
reference	2021ApJS..256...28L

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-2.97	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-2.65	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-2.50	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-2.42	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-2.37	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-2.34	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-2.32	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-2.30	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-2.86	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	-2.73	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-2.46	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-3.00	-15.0, 15.0	5.1	-15.0, 15.0