J07004+2307

LAMOSTJ070027.78+230755.6 · 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]	28473 ± 550
log g	5.592 ± 0.088
log n(He)/n(H)	-2.419 ± 0.121
reduced χ²	0.990 over 637 points
radial velocity	-155.0 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 18:27:58

Fit — Lei (TLUSTY)

T_eff [K]	29250 ± 200
log g	5.480 ± 0.060
log n(He)/n(H)	-2.600 ± 0.100
grids	Lei et al. 2019, ApJ 881, 135 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

source file

spec-57039-GAC105N24M1_sp05-046.fits.gz

Gaia astrometry

Gaia DR3 source	3380129503787793920
parallax [mas]	0.3263 ± 0.0825
G	17.023
μ_α [mas/yr]	-1.528
μ_δ [mas/yr]	-1.041
l, b	193.005, 12.202

Published (Culpan et al. 2022)

class (Culpan)	sdB
T_eff [K]	31002 ± 194
log g	5.56 ± 0.05
log y	-2.39 ± 0.05
reference	2021ApJS..256...28L

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-2.51	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-2.24	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-2.12	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-2.05	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-2.01	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-1.98	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-1.96	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-1.95	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-2.42	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	-2.31	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-2.08	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-2.54	-15.0, 15.0	5.1	-15.0, 15.0