J04241+0833

LAMOSTJ042409.66+083317.2 · Culpan knownhsd

χ²/N = 0.93

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]	25905 ± 183
log g	5.252 ± 0.027
log n(He)/n(H)	-1.287 ± 0.025
reduced χ²	0.935 over 658 points
radial velocity	-108.0 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 18:26:38

Fit — Lei (TLUSTY)

T_eff [K]	27210 ± 190
log g	5.270 ± 0.010
log n(He)/n(H)	-1.320 ± 0.020
grids	Lei et al. 2018, ApJ 868, 70 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

cosmic rays	3 pixels cancelled
source file	spec-57437-HD042621N083524V01_sp04-162.fits.gz

Gaia astrometry

Gaia DR3 source	3299455110137611776
parallax [mas]	1.8560 ± 0.0324
G	12.513
G_abs	3.906
μ_α [mas/yr]	16.559
μ_δ [mas/yr]	-19.050
l, b	185.974, -27.361

Published (Culpan et al. 2022)

class (Culpan)	sdB
class (SIMBAD)	B4pk
T_eff [K]	25344 ± 253
log g	5.04 ± 0.02
log y	-1.14 ± 0.00
reference	2021ApJS..256...28L

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-1.75	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-1.56	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-1.48	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-1.43	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-1.40	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-1.38	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-1.37	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-1.36	-13.0, 13.0	3.9	-11.7, 11.6
H_κ	3750.15	-1.35	-10.0, 10.0	3.9	-7.4, 8.7
He II 4686	4685.70	-1.69	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	-1.61	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-1.45	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-1.77	-15.0, 15.0	5.1	-15.0, 15.0