J16229+4730sdB

PG1621+476  ·  16:22:56.66 47:30:51.12  ·  Culpan knownhsd

χ²/N = 0.96

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]27747 ± 161
log g5.747 ± 0.029
log n(He)/n(H)-1.926 ± 0.052
reduced χ²0.962 over 640 points
radial velocity-31.0 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 19:09:39

Fit — uli

Teff [K]28254 ± 196
log g5.663 ± 0.031
log n(He)/n(H)-1.913 ± 0.050
reduced χ²0.959 over 640 points
radial velocity-31.0 km s−1
resolution (FWHM)2.00 Å
lines fitted12
gridsh667.grid
h909.grid
h97.grid
h99.grid
+1 more
fitted04/09/2026 18:36:28

Observation

telescopeSDSS 2.5-M
survey / programmeboss
date2013-06-06
exposure2703 s in 6
pipelinev5_13_2
S/N (classifier)46.5
source filespec-6321-56449-0131.fits

Gaia astrometry

Gaia DR3 source1410860511508492288
parallax [mas]0.5514 ± 0.0445
G16.219
Gabs4.908
μα [mas/yr]-3.595
μδ [mas/yr]-2.453
l, b74.072, 44.351

Published (Culpan et al. 2022)

class (Culpan)sdB+BD
class (SIMBAD)sdB+dM
Teff [K]29000 ± 600
log g5.65 ± 0.06
log y-1.90 ± 0.10
reference2015A&A...577A..26G

Classifier

AGREES

fitted Teff 29000 logg 5.65 logY -1.9 2015A&A...577A..26G

auto: contrast 0.10, within the 0.33 a subdwarf reaches at 26 kK, Mg I b suggests a companion but Ca II does not (0.3 sigma)

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-0.50-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-0.45-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-0.42-40.0, 31.64.2-43.0, 43.0
Hε3970.07-0.41-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-0.40-20.0, 26.24.0-31.8, 32.0
Hη3835.38-0.40-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-0.39-16.0, 16.03.9-15.6, 16.7
Hι3770.63-0.39-13.0, 13.03.9-11.7, 11.6
He II 46864685.70-0.48-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-0.46-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-0.42-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-0.51-15.0, 15.05.1-15.0, 15.0

Spectral energy distribution

Teff 27747 K · log g 5.747 · E(44−55) 0.020 · χ²r 0.21 over 31 bands

distance 1814 pc · parallax 0.5500 ± 0.0400 mas (7%) · R 0.1446 +0.0129 −0.0109 R☉ · M 0.427 +0.099 −0.077 M☉ · L 11.2 +2.1 −1.7 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.