J03289+5035sdB

UVEXJ032855.25+503529.8 · 03:28:55.26 50:35:29.69 · 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]	27659 ± 226
log g	5.711 ± 0.039
log n(He)/n(H)	-2.327 ± 0.080
reduced χ²	0.986 over 636 points
radial velocity	-85.0 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 19:07:26

Fit — uli

T_eff [K]	28139 ± 268
log g	5.621 ± 0.041
log n(He)/n(H)	-2.315 ± 0.086
reduced χ²	0.991 over 636 points
radial velocity	-85.0 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 18:34:40

Observation

telescope	SDSS 2.5-M
survey / programme	MWM / mwm_cb
field · MJD	103753 · 60327
date	2024-01-18
catalogid	63050394789593413
exposure	900 s in 1
airmass	1.07
seeing (50%)	1.67″
E(B−V)	0.179
pipeline	v6_2_1
cosmic rays	13 pixels cancelled
S/N (classifier)	31.2
source file	spec-103753-60327-63050394789593413.fits

Gaia astrometry

Gaia DR3 source	441838202167403776
parallax [mas]	1.7123 ± 0.0231
G	14.152
BP − RP	0.127
G_abs	5.364
μ_α [mas/yr]	-5.308
μ_δ [mas/yr]	-4.747
l, b	146.770, -4.846

Published (Culpan et al. 2022)

class (Culpan)	sdB+dM
class (SIMBAD)	sdB
T_eff [K]	28500 ± 1000
log g	5.50 ± 0.10
log y	-2.50 ± 0.10
reference	2012MNRAS.426.1235V

Classifier

AGREES

fitted Teff 28500 logg 5.5 logY -2.5 2012MNRAS.426.1235V

auto: contrast 0.12, within the 0.32 a subdwarf reaches at 26 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	-1.38	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-1.23	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-1.16	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-1.13	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-1.10	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-1.09	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	-1.08	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	-1.07	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	-1.33	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	-1.27	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-1.14	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-1.40	-15.0, 15.0	5.1	-15.0, 15.0

Spectral energy distribution

T_eff 27659 K · log g 5.711 · E(44−55) 0.352 · χ²_r 0.30 over 36 bands

distance 584 pc · parallax 1.7100 ± 0.0200 mas (1%) · R 0.1896 +0.0037 −0.0036 R☉ · M 0.673 +0.087 −0.076 M☉ — above the 0.47 canonical mass · L 19.0 +0.9 −0.9 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.