J11397+4643sdB

PG1137+470 · 11:39:42.02 46:43:49.51 · Culpan knownhsd

outside the grid χ²/N = 1.01

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]	29606 ± 228
log g	5.557 ± 0.032
log n(He)/n(H)	-5.850 ± 1.445 upper limit
reduced χ²	1.008 over 639 points
radial velocity	-33.0 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 18:30:30

Fit — Lei (TLUSTY)

T_eff [K]	30760 ± 170
log g	5.550 ± 0.050
log n(He)/n(H)	-3.000 ± 0.000
grids	Lei et al. 2019, ApJ 881, 135 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid
helium	published as a limit

Observation

cosmic rays	9 pixels cancelled
S/N (classifier)	26.4
source file	spec-58845-HD113736N444258M02_sp11-118.fits.gz

Gaia astrometry

Gaia DR3 source	786220877662239488
parallax [mas]	0.5132 ± 0.0457
G	15.552
G_abs	4.143
μ_α [mas/yr]	-3.394
μ_δ [mas/yr]	-13.927
l, b	153.975, 65.840

Published (Culpan et al. 2022)

class (Culpan)	sdB
class (SIMBAD)	sdB
T_eff [K]	33402 ± 182
log g	5.98 ± 0.04
log y	-3.77 ± 0.46
reference	2021ApJS..256...28L

Classifier

AGREES

fitted Teff 33402 logg 5.98 logY -3.77 2021ApJS..256...28L

auto: contrast 0.11, within the 0.27 a subdwarf reaches at 30 kK, Mg I b suggests a companion but Ca II does not (0.6 sigma)

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-0.54	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-0.48	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-0.45	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-0.44	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-0.43	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-0.42	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-0.42	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-0.42	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-0.52	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	-0.49	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-0.44	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-0.54	-15.0, 15.0	5.1	-15.0, 15.0