J13306-0017sdB

SDSSJ133040.91-001710.7  ·  13:30:40.92 -00:17:10.64  ·  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

profile fit on the Bamberg grid
Observed spectrum in black, model in red, offset by line. Balmer series left, helium right.

Line-profile fit — uli

profile fit on the uli grid
Observed spectrum in black, model in red, offset by line. Balmer series left, helium right.

Results and provenance

Fit — Bamberg

Teff [K]28197 ± 162
log g5.768 ± 0.027
log n(He)/n(H)-2.615 ± 0.071
reduced χ²0.989 over 639 points
radial velocity-19.0 km s−1
resolution (FWHM)2.00 Å
lines fitted12
gridsHE-0.041.fits
HE-0.125.fits
HE-0.300.fits
HE-0.550.fits
+9 more
fitted04/09/2026 19:09:00

Fit — uli

Teff [K]28780 ± 197
log g5.679 ± 0.030
log n(He)/n(H)-2.655 ± 0.073
reduced χ²0.987 over 639 points
radial velocity-19.0 km s−1
resolution (FWHM)2.00 Å
lines fitted12
gridsh667.grid
h909.grid
h97.grid
h99.grid
+1 more
fitted04/09/2026 18:35:55

Observation

telescopeSDSS 2.5-M
survey / programmeboss
date2011-02-07
exposure6306 s in 14
pipelinev5_13_2
S/N (classifier)68.6
source filespec-4050-55599-0014.fits

Gaia astrometry

Gaia DR3 source3638888712001832704
parallax [mas]0.5644 ± 0.0676
G16.084
Gabs4.876
μα [mas/yr]-6.856
μδ [mas/yr]-0.989
l, b323.514, 61.007

Published (Culpan et al. 2022)

class (Culpan)sdB
class (SIMBAD)sdB
Teff [K]29545 ± 344
log g5.90 ± 0.08
log y-2.80 ± 0.13
reference2021ApJS..256...28L

Classifier

AGREES

fitted Teff 29545 logg 5.9 logY -2.8 2021ApJS..256...28L

auto: contrast 0.07, within the 0.32 a subdwarf reaches at 26 kK, Ca II 8662/8542 = 11.9 -- the star's own Paschen lines, not a companion

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-0.31-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-0.28-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-0.26-40.0, 31.64.2-43.0, 43.0
Hε3970.07-0.25-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-0.25-20.0, 26.24.0-31.8, 32.0
Hη3835.38-0.24-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-0.24-16.0, 16.03.9-15.6, 16.7
Hι3770.63-0.24-13.0, 13.03.9-11.7, 11.6
He II 46864685.70-0.30-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-0.28-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-0.26-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-0.31-15.0, 15.05.1-15.0, 15.0

Spectral energy distribution

Teff 28197 K · log g 5.768 · E(44−55) 0.030 · χ²r 0.16 over 42 bands

distance 1772 pc · parallax 0.5600 ± 0.0700 mas (12%) · R 0.1493 +0.0204 −0.0159 R☉ · M 0.478 +0.156 −0.109 M☉ · L 12.7 +3.7 −2.6 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.