J11372+1208sdOB

SDSSJ113715.31+120810.0 · 11:37:15.31 12:08:09.85 · Culpan knownhsd

χ²/N = 0.97

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.

Line-profile fit — uli

Observed spectrum in black, model in red, offset by line. Balmer series left, helium right.

Results and provenance

Fit — Bamberg

T_eff [K]	33980 ± 224
log g	5.940 ± 0.027
log n(He)/n(H)	-1.240 ± 0.037
reduced χ²	0.973 over 636 points
radial velocity	-186.0 km s⁻¹
resolution (FWHM)	2.00 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 19:08:37

Fit — uli

T_eff [K]	34026 ± 149
log g	5.926 ± 0.027
log n(He)/n(H)	-1.275 ± 0.041
reduced χ²	0.972 over 636 points
radial velocity	-186.0 km s⁻¹
resolution (FWHM)	2.00 Å
lines fitted	12
grids	h667.grid h909.grid h97.grid h99.grid +1 more
fitted	04/09/2026 18:35:35

Observation

telescope	SDSS 2.5-M
survey / programme	boss
date	2012-02-29
exposure	3603 s in 8
pipeline	v5_13_2
S/N (classifier)	52.7
source file	spec-5379-55986-0522.fits

Gaia astrometry

Gaia DR3 source	3917573295704299904
parallax [mas]	0.4364 ± 0.0650
G	16.128
G_abs	4.356
μ_α [mas/yr]	2.873
μ_δ [mas/yr]	4.944
l, b	250.075, 67.040

Published (Culpan et al. 2022)

class (Culpan)	sdB
class (SIMBAD)	DA4

Classifier

DISPUTED

auto: He II 0.57 (4.4 sigma), Mg I b suggests a companion but Ca II does not (-0.1 sigma)

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-3.02	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-2.69	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-2.54	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-2.46	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-2.41	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-2.38	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-2.36	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-2.34	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-2.91	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	-2.77	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-2.50	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-3.05	-15.0, 15.0	5.1	-15.0, 15.0

Spectral energy distribution

T_eff 33980 K · log g 5.940 · E(44−55) 0.016 · χ²_r 0.32 over 36 bands

distance 2291 pc · parallax 0.4400 ± 0.0700 mas (16%) · R 0.1554 +0.0274 −0.0201 R☉ · M 0.770 +0.316 −0.202 M☉ — above the 0.47 canonical mass · L 29.1 +11.1 −7.1 L☉

Photometry against the model, with the residual beneath it in units of the error. The horizontal bar on each point is the passband, not an error; a hollow point was not fitted and the tooltip says why. Drag a box to zoom, double-click or Esc to come back out.