J17537-7051sdB

17:53:42.86 -70:51:03.85 · Culpan hotsd

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.

Results and provenance

Fit — Bamberg

T_eff [K]	24999 ± 810
log g	5.405 ± 0.122
log n(He)/n(H)	-2.522 ± 0.140
reduced χ²	0.995 over 574 points
radial velocity	-28.0 km s⁻¹
resolution (FWHM)	2.00 Å
lines fitted	13
grids	HE-0.041.fits HE-0.125.fits HE-0.300.fits HE-0.550.fits +9 more
fitted	04/09/2026 19:10:06

Observation

telescope	LCO Du Pont
survey / programme	MWM / mwm_cb
field · MJD	030463 · 60167
date	2023-08-11
catalogid	27021599283375519
exposure	2700 s in 3
airmass	1.40
seeing (50%)	2.69″
E(B−V)	0.071
pipeline	v6_2_1
S/N (classifier)	31.2
source file	spec-030463-60167-27021599283375519.fits

Gaia astrometry

Gaia DR3 source	5809843325487481472
parallax [mas]	0.4484 ± 0.0403
G	15.929
BP − RP	-0.288
G_abs	4.188
μ_α [mas/yr]	-1.525
μ_δ [mas/yr]	-14.594
RUWE	1.024
l, b	322.822, -20.977
selection	f_plx

Published (Culpan et al. 2022)

class (classifier)

TODO — superseded by eye

Classifier

DECLINED

auto: blue end unusable, Balmer 7.1 is subdwarf-like but He I only 0.19 and Gabs 4.19 does not settle it

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	-0.45	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	-0.41	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	-0.38	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	-0.37	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	-0.36	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	-0.36	-20.0, 14.6	4.0	-20.7, 21.8
H\d10 3797.90 ----
H\d11 3770.63 ----
H\d12 3750.15 ----
He II 4686	4685.70	-0.44	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	-0.42	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	-0.38	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	-0.46	-15.0, 15.0	5.1	-15.0, 15.0

Spectral energy distribution

T_eff 24999 K · log g 5.405 · E(44−55) 0.064 · χ²_r 0.17 over 37 bands

distance 2230 pc · parallax 0.4500 ± 0.0400 mas (9%) · R 0.2375 +0.0237 −0.0197 R☉ · M 0.524 +0.131 −0.100 M☉ · L 19.9 +4.2 −3.2 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.