J08375+0302sdB

SDSSJ083733.14+030209.1 · 08:37:33.14 03:02:09.28 · Culpan knownhsd

χ²/N = 0.99

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]	28506 ± 186
log g	5.582 ± 0.028
log n(He)/n(H)	-2.983 ± 0.115
reduced χ²	0.989 over 639 points
radial velocity	-70.0 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 19:07:57

Fit — uli

T_eff [K]	29140 ± 215
log g	5.490 ± 0.030
log n(He)/n(H)	-2.949 ± 0.076
reduced χ²	0.989 over 639 points
radial velocity	-70.0 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 18:35:01

Observation

telescope	SDSS 2.5-M
survey / programme	boss
date	2011-12-28
exposure	5405 s in 12
pipeline	v5_13_2
cosmic rays	3 pixels cancelled
S/N (classifier)	64.1
source file	spec-4789-55923-0028.fits

Gaia astrometry

Gaia DR3 source	3080005199256969984
parallax [mas]	0.3144 ± 0.0527
G	16.053
G_abs	3.628
μ_α [mas/yr]	2.406
μ_δ [mas/yr]	-6.425
l, b	222.851, 24.904

Published (Culpan et al. 2022)

class (Culpan)	sdB
class (SIMBAD)	sdB

Classifier

AGREES

auto: contrast 0.10, within the 0.30 a subdwarf reaches at 28 kK, Mg I b suggests a companion but Ca II does not (-2.2 sigma)

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-1.14	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-1.01	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-0.96	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-0.93	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-0.91	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-0.90	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-0.89	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-0.88	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-1.09	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	-1.04	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-0.94	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-1.15	-15.0, 15.0	5.1	-15.0, 15.0

Spectral energy distribution

T_eff 28506 K · log g 5.582 · E(44−55) 0.034 · χ²_r 0.36 over 39 bands

distance 3181 pc · parallax 0.3100 ± 0.0500 mas (16%) · R 0.2685 +0.0544 −0.0384 R☉ · M 1.008 +0.475 −0.286 M☉ — above the 0.47 canonical mass · L 42.9 +19.2 −11.5 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.