J16322+1753sdB

PG1629+179  ·  16:32:12.26 17:53:18.49  ·  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]39494 ± 301
log g5.833 ± 0.030
log n(He)/n(H)-3.385 ± 0.227
reduced χ²0.982 over 639 points
radial velocity-122.0 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 19:09:43

Fit — uli

Teff [K]36549 ± 260
log g5.718 ± 0.035
log n(He)/n(H)-3.145 ± 0.125 upper limit
reduced χ²0.975 over 639 points
radial velocity-122.0 km s−1
resolution (FWHM)2.00 Å
lines fitted12
gridsh667.grid
h909.grid
h97.grid
h99.grid
+1 more
settledoutside the grid
fitted04/09/2026 18:36:31

Observation

telescopeSDSS 2.5-M
survey / programmeboss
date2010-06-19
exposure6306 s in 14
pipelinev5_13_2
S/N (classifier)70.7
source filespec-4064-55366-0778.fits

Gaia astrometry

Gaia DR3 source4467169787783133312
parallax [mas]0.5559 ± 0.0575
G15.986
Gabs4.787
μα [mas/yr]-5.119
μδ [mas/yr]-15.993
l, b34.813, 38.575

Published (Culpan et al. 2022)

class (Culpan)sdB
class (SIMBAD)sdB
Teff [K]38701 ± 361
log g5.84 ± 0.05
log y-3.44 ± 0.67
reference2021ApJS..256...28L

Classifier

AGREES

fitted Teff 38701 logg 5.84 logY -3.44 2021ApJS..256...28L

auto: contrast 0.05, within the 0.20 a subdwarf reaches at 36 kK, Mg I b suggests a companion but Ca II does not (0.7 sigma)

Fitted lines

lineλ [Å]shift [Å]continuum at±avgfitted over
Hβ4861.32-1.98-40.0, 40.05.0-45.0, 45.0
Hγ4340.46-1.77-40.0, 36.84.5-43.0, 43.0
Hδ4101.73-1.67-40.0, 31.64.2-43.0, 43.0
Hε3970.07-1.62-28.0, 30.04.1-30.0, 35.0
Hζ3889.05-1.58-20.0, 26.24.0-31.8, 32.0
Hη3835.38-1.56-20.0, 14.64.0-20.7, 21.8
Hθ3797.90-1.55-16.0, 16.03.9-15.6, 16.7
Hι3770.63-1.53-13.0, 13.03.9-11.7, 11.6
He II 46864685.70-1.91-11.9, 11.94.9-15.0, 13.8
He I 44724471.60-1.82-15.0, 15.04.6-15.0, 15.0
He I 40264026.29-1.64-24.2, 15.04.2-15.0, 15.0
He I 49224921.93-2.00-15.0, 15.05.1-15.0, 15.0

Spectral energy distribution

Teff 39494 K · log g 5.833 · E(44−55) 0.066 · χ²r 0.19 over 38 bands

distance 1799 pc · parallax 0.5600 ± 0.0600 mas (11%) · R 0.1247 +0.0145 −0.0117 R☉ · M 0.387 +0.110 −0.080 M☉ · L 34.1 +8.4 −6.2 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.