J08161+4803sdB

LAMOSTJ081607.81+480350.7 · 08:16:07.92 48:03:49.75 · Culpan hotsd

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]	24367 ± 200
log g	5.470 ± 0.028
log n(He)/n(H)	-3.071 ± 0.091
reduced χ²	0.997 over 656 points
radial velocity	-80.0 km s⁻¹
resolution (FWHM)	2.50 Å
lines fitted	13
grids	HE-0.041.fits HE-0.125.fits HE-0.300.fits HE-0.550.fits +9 more
fitted	04/09/2026 18:29:06

Fit — Lei (TLUSTY)

T_eff [K]	24740 ± 610
log g	5.500 ± 0.040
log n(He)/n(H)	-3.080 ± 0.110
grids	Lei et al. 2019, ApJ 881, 135 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

S/N (classifier)	73.8
source file	spec-56653-HD081205N465629B01_sp09-068.fits.gz

Gaia astrometry

Gaia DR3 source	931348922106072704
parallax [mas]	0.4596 ± 0.1353
G	15.157
BP − RP	-0.291
μ_α [mas/yr]	-3.908
μ_δ [mas/yr]	-4.549
RUWE	3.193
l, b	171.399, 33.644
selection	f_pm

Published (Culpan et al. 2022)

class (Culpan)

sdB

Classifier

AGREES

fitted Teff 24911 logg 5.3 logY -3.02 2021ApJS..256...28L

auto: contrast 0.18, within the 0.32 a subdwarf reaches at 27 kK, Ca II 8662/8542 = 6.9 -- the star's own Paschen lines, not a companion

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-1.30	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-1.16	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-1.09	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-1.06	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-1.04	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-1.02	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-1.01	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-1.01	-13.0, 13.0	3.9	-11.7, 11.6
H_κ	3750.15	-1.00	-10.0, 10.0	3.9	-7.4, 8.7
He II 4686	4685.70	-1.25	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	-1.19	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-1.07	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-1.31	-15.0, 15.0	5.1	-15.0, 15.0