J/other/PHYS/101.D5004 Benchmarking B-type line list (Guney+, 2026)
Benchmarking a new atomic line list for high-resolution spectroscopy of B-Type
Stars: chemical characterization of single and binary stellar systems.
Guney F., Sahin T., Dervisoglu A.
<Phys. Scr., 101, 045004 (2026)>
=2026PhyS..101d5004G 2026PhyS..101d5004G (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics ; Spectroscopy ; Abundances ; Stars, B-type ;
Binaries, eclipsing
Keywords: atomic data - line lists - B-type stars - spectroscopy -
chemical abundances - binary stars
Abstract:
We present a new practical atomic line list for the optical and
near-infrared spectral regions (3850-8220Å), specifically tailored
for the spectroscopic analysis of hot B-type stars. Compiled through
careful merging and expansion of established literature sources, this
list addresses the critical lack of comprehensive and homogeneous
atomic data for hot star spectroscopy. The line list was rigorously
validated using high-resolution HERMES and UCLES spectra of the
benchmark star HR 1765 and FOCES spectra of the Algol-type binary
system u Herculis. By performing a homogeneous local thermodynamic
equilibrium (LTE) abundance analysis with literature stellar
parameters, we successfully reproduced the published results for the
single star HR 1765 and obtained a revised abundance pattern for the
mass-gaining primary component of u Her. A key aspect of our
methodology is the subsequent application of NLTE calculations for
several key species (He, Ne, and Si). The spurious helium enrichment
suggested by LTE for HR 1765 was resolved, yielding an NLTE abundance
consistent with the local cosmic standard, thereby mitigating the
systematic biases inherent in the LTE approach and yielding abundances
consistent with the cosmic standards. The results for u Her confirm
the presence of CNO-processed material on its surface, which is
characterized by nitrogen enrichment and carbon depletion. The
expanded coverage of our line list enabled the first spectroscopic
detection of ClII in HR 1765 and the first measurement of Ne
abundance in u Her. Furthermore, we report the first abundance
determination of PIII, SII/III, ArII, and FeIII in u Her. The
consistency of our results with those of previous studies employing
different methodologies underscores the robustness and reliability of
the compiled line list, establishing it as a valuable and readily
applicable resource for future spectroscopic studies on hot stars,
particularly in the context of interacting binary systems.
Description:
This catalog provides a comprehensive atomic line list ('blines.dat')
compiled for the high-resolution spectroscopic analysis of B-type
stars. The list includes selected unblended lines with reliable atomic
parameters, with oscillator strengths and level energies traced back
to the references listed in 'lineref.dat'. In addition, the catalog
presents a comparative chemical abundance study ('meanabd.dat') and
detailed line-by-line results ('abund.dat') for the B-type stars u Her
(HD 156633) and HR 1765.
Objects:
-------------------------------------------------
RA (2000) DE Designation(s)
-------------------------------------------------
05 21 45.74 +00 22 56.8 HR 1765 = * o Ori
17 17 19.56 +33 06 00.3 HD 156633 = * u Her
-------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
blines.dat 39 171 Curated atomic line list
lineref.dat 170 20 Bibliographic references for log(gf)
meanabd.dat 91 16 Mean elemental abundances
abund.dat 52 169 Line-by-line elemental abundances
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Byte-by-byte Description of file: blines.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.4 0.1nm Wave Wavelength
12- 17 A6 --- Ion Ion designation
19- 25 F7.3 eV EP Lower excitation potential
27- 33 F7.3 --- loggf Adopted log(gf)
35- 39 A5 --- r_loggf Reference code, in lineref.dat
--------------------------------------------------------------------------------
Byte-by-byte Description of file: lineref.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- Ref Reference code
7- 24 A18 --- Auth First author
26- 44 A19 --- BibCode ADS Bibcode
46-170 A125 --- Comm Description
--------------------------------------------------------------------------------
Byte-by-byte Description of file: meanabd.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- El Element/ion
8- 13 F6.2 --- logEKOL ? u Her mean abundance (KOL) (G1)
15- 19 F5.2 --- e_logEKOL ? Uncertainty on logEKOL
21- 23 I3 --- n_logEKOL ? Number of lines for logEKOL
25- 30 F6.2 --- logEuTS ? u Her mean abundance (TS) (G1)
32- 36 F5.2 --- e_logEuTS ? Uncertainty on logEuTS
38- 40 I3 --- n_logEuTS ? Number of lines for logEuTS
42- 47 F6.2 --- logESAH ? HR 1765 mean abundance (SAH) (G1)
49- 53 F5.2 --- e_logESAH ? Uncertainty on logESAH
55- 57 I3 --- n_logESAH ? Number of lines for logESAH
59- 64 F6.2 --- logEaTS ? HR 1765 (AAT) mean abundance (TS) (G1)
66- 70 F5.2 --- e_logEaTS ? Uncertainty on logEaTS
72- 74 I3 --- n_logEaTS ? Number of lines for logEaTS
76- 81 F6.2 --- logEhTS ? HR 1765 (HERMES) abundance (TS) (G1)
83- 87 F5.2 --- e_logEhTS ? Uncertainty on logEhTS
89- 91 I3 --- n_logEhTS ? Number of lines for logEhTS
--------------------------------------------------------------------------------
Byte-by-byte Description of file: abund.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.2 0.1nm Wave Wavelength
12- 17 A6 --- Ion Ion designation
19- 24 F6.2 --- logEKOL ? Line abundance (KOL) (G1)
26- 31 F6.2 --- logEuTS ? Line abundance (u Her, TS) (G1)
33- 38 F6.2 --- logESAH ? Line abundance (SAH) (G1)
40- 45 F6.2 --- logEaTS ? Line abundance (HR 1765 AAT, TS) (G1)
47- 52 F6.2 --- logEhTS ? Line abundance (HR 1765 HERMES, TS) (G1)
--------------------------------------------------------------------------------
Global notes:
Note (G1): References:
KOL = Kolbas et al., 2014MNRAS.444.3118K 2014MNRAS.444.3118K
SAH = Sahin & Dervisoglu, 2019AstL...45..528S 2019AstL...45..528S
TS = This Study
--------------------------------------------------------------------------------
Acknowledgements:
Ferhat Guney, ferhatguney.au(at)gmail.com
References:
Kolbas et al., 2014MNRAS.444.3118K 2014MNRAS.444.3118K, u Her abundances
Sahin et al., 2019AstL...45..528S 2019AstL...45..528S, HR 1765 abundances
(End) Patricia Vannier [CDS] 09-Jan-2026