J21180+1440

PG2115+145 · Culpan knownhsd

outside the grid 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]	27675 ± 131
log g	5.666 ± 0.020
log n(He)/n(H)	-6.170 ± 0.520 upper limit
reduced χ²	0.999 over 640 points
radial velocity	-63.0 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
settled	outside the grid
fitted	04/09/2026 18:33:26

Fit — Lei (TLUSTY)

T_eff [K]	28960 ± 70
log g	5.600 ± 0.020
log n(He)/n(H)	-3.000 ± 0.000
grids	Lei et al. 2020, ApJ 889, 117 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

cosmic rays	15 pixels cancelled
source file	spec-58040-GACII320N14M1_sp14-174.fits.gz

Gaia astrometry

Gaia DR3 source	1759463868550744576
parallax [mas]	0.8928 ± 0.0417
G	15.046
G_abs	4.848
μ_α [mas/yr]	5.111
μ_δ [mas/yr]	-8.144
l, b	65.142, -23.478

Published (Culpan et al. 2022)

class (Culpan)	sdB
class (SIMBAD)	sdB
T_eff [K]	28306 ± 201
log g	5.42 ± 0.03
log y	-3.89 ± 0.16
reference	2021ApJS..256...28L

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-1.02	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-0.91	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-0.86	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-0.83	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-0.82	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-0.81	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-0.80	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-0.79	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-0.98	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	-0.94	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-0.85	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-1.03	-15.0, 15.0	5.1	-15.0, 15.0