J15288+0931sdB

SDSSJ152852.27+093144.2  ·  15:28:52.27 09:31:44.29  ·  Culpan knownhsd

χ²/N = 0.98

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]32702 ± 170
log g5.963 ± 0.026
log n(He)/n(H)-1.671 ± 0.034
reduced χ²0.981 over 637 points
radial velocity-11.0 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 19:09:24

Fit — uli

Teff [K]31744 ± 292
log g5.926 ± 0.029
log n(He)/n(H)-1.673 ± 0.036
reduced χ²0.973 over 637 points
radial velocity-11.0 km s−1
resolution (FWHM)2.00 Å
lines fitted12
gridsh667.grid
h909.grid
h97.grid
h99.grid
+1 more
fitted04/09/2026 18:36:14

Observation

telescopeSDSS 2.5-M
survey / programmeboss
date2012-03-16
exposure4504 s in 10
pipelinev5_13_2
S/N (classifier)61.0
source filespec-5209-56002-0634.fits

Gaia astrometry

Gaia DR3 source1165536789924111616
parallax [mas]0.3593 ± 0.0614
G16.425
Gabs4.197
μα [mas/yr]-6.524
μδ [mas/yr]-2.837
l, b15.168, 48.949

Published (Culpan et al. 2022)

class (Culpan)sdB
class (SIMBAD)sdB
Teff [K]32580 ± 915
log g5.85 ± 0.13
log y-1.80 ± 0.20
reference2017OAst...26..164G

Classifier

AGREES

fitted Teff 32580 logg 5.85 logY -1.8 2017OAst...26..164G

auto: contrast 0.03, within the 0.28 a subdwarf reaches at 30 kK, Mg I b suggests a companion but Ca II does not (-0.2 sigma)

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-0.18-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-0.16-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-0.15-40.0, 31.64.2-43.0, 43.0
Hε3970.07-0.15-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-0.14-20.0, 26.24.0-31.8, 32.0
Hη3835.38-0.14-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-0.14-16.0, 16.03.9-15.6, 16.7
Hι3770.63-0.14-13.0, 13.03.9-11.7, 11.6
He II 46864685.70-0.17-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-0.16-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-0.15-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-0.18-15.0, 15.05.1-15.0, 15.0

Spectral energy distribution

Teff 32702 K · log g 5.963 · E(44−55) 0.022 · χ²r 0.15 over 36 bands

distance 2783 pc · parallax 0.3600 ± 0.0600 mas (17%) · R 0.1715 +0.0356 −0.0250 R☉ · M 0.989 +0.477 −0.285 M☉ — above the 0.47 canonical mass · L 30.4 +13.9 −8.3 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.