J09474+2716sdB

PG0944+275 · 09:47:29.35 27:16:27.12 · Culpan knownhsd

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]	28647 ± 437
log g	5.713 ± 0.079
log n(He)/n(H)	-2.772 ± 0.158
reduced χ²	1.014 over 638 points
radial velocity	2.0 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 18:29:58

Fit — Lei (TLUSTY)

T_eff [K]	29550 ± 320
log g	5.570 ± 0.060
log n(He)/n(H)	-2.880 ± 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	26 pixels cancelled
S/N (classifier)	55.0
source file	spec-59937-HD094138N255446M02_sp12-003.fits.gz

Gaia astrometry

Gaia DR3 source	647193232966817280
parallax [mas]	0.4552 ± 0.0695
G	16.599
G_abs	4.879
μ_α [mas/yr]	1.484
μ_δ [mas/yr]	-12.488
l, b	201.761, 49.340

Published (Culpan et al. 2022)

class (Culpan)	sdB
class (SIMBAD)	sdB
T_eff [K]	32501 ± 205
log g	5.92 ± 0.05
log y	-2.63 ± 0.07
reference	2021ApJS..256...28L

Classifier

AGREES

fitted Teff 32501 logg 5.92 logY -2.63 2021ApJS..256...28L

auto: contrast 0.09, within the 0.28 a subdwarf reaches at 29 kK, Mg I b suggests a companion but Ca II does not (-0.3 sigma)

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	0.03	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	0.03	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	0.03	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	0.03	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	0.03	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	0.03	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	0.03	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	0.03	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	0.03	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	0.03	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	0.03	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	0.03	-15.0, 15.0	5.1	-15.0, 15.0