J/AJ/166/54 Surface line identifications for HD 99803A (Monier+, 2023)
The Surface Composition of Six Newly Discovered Chemically Peculiar Stars.
Comparison to the HgMn Stars mu Lep and beta Scl and the Superficially Normal B
Star nu Cap.
Monier R., Niemczura E., Kurtz D.W., Rappaport S., Bowman D.M.,
Murphy S.J., Lebreton Y., Stuik R., Deal M., Merle T., Kilicoglu T.,
Gebran M., Le Ster E.
<Astron. J., 166, 54 (2023)>
=2023AJ....166...54M 2023AJ....166...54M
ADC_Keywords: Stars, peculiar; Stars, double and multiple; Spectra, optical;
Abundances; Energy distributions
Keywords: Eclipsing binary stars ; Chemically peculiar stars
Abstract:
We report on a detailed abundance study of six bright, mostly
southern, slowly rotating late B-stars: HD1279 (B8III), HD99803 (B9V),
HD123445 (B9V), HD147550 (B9V), HD171961 (B8III), and HD202671
(B5II/III), hitherto reported as normal stars. We compare them to the
two classical HgMn stars µLep and βScl, and to the
superficially normal star νCap. In the spectra of the six stars,
the HgII line at 3984Å line is clearly seen and numerous lines of
P, Ti, Mn, Fe, Ga, Sr, Y, and Zr appear to be strong absorbers. A
comparison of newly acquired and archival spectra of these objects
with a grid of synthetic spectra for selected unblended lines reveals
large overabundances of P, Ti, Cr, Mn, Sr, Y, Zr, Ba, Pt, and Hg, and
underabundances of He, Mg, Sc, and Ni. The effective temperatures,
surface gravities, low projected rotational velocities, and the
peculiar abundance patterns of the six investigated stars show that
they are new chemically peculiar stars, mostly new HgMn stars, and are
reclassified as such. The evolutionary status of these stars has been
inferred, and their ages and masses estimated. The two most massive
objects, HD1279 and HD202671, might have evolved away from the main
sequence recently, the other stars are main-sequence objects. HD99803A
is a sharp lined HgMn star with grazing eclipses. From TESS and
MASCARA photometry, we determine an orbital period of
Porb=26.12022±0.00004day.
Objects:
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RA (ICRS) DE Designation(s)
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11 28 35.07 -42 40 27.1 HD 99803 = ** BSO 6A
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Description:
FEROS (R=65000) and HARPS (R=115000) archival spectra were used for
HD 99803.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table10.dat 50 943 Line identifications for HD 99803A (HR 4423)
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See also:
III/117 : MK Classifications of Close Visual Binaries (Corbally, 1984)
II/215 : uvby-beta Catalogue (Hauck+ 1997)
J/A+A/274/335 : Abundances in normal late-B and HgMn stars (Smith+ 1993)
J/AJ/107/1556 : Late B-type stars classification (Garrison+, 1994)
J/A+AS/125/219 : Abundances of mu Lep, 7 Sex, HR 4817 & 28 Her (Adelman+ 1997)
J/A+A/425/263 : Spectroscopic atlas of HD17564 (Castelli+, 2004)
J/ApJS/162/227 : Transition probabilities for SmII (Lawler+, 2006)
J/MNRAS/418/863 : NLTE corrections for Mg and Ca lines (Merle+ 2011)
J/A+A/537/A146 : Stellar models with rot. 0.8<M<120, Z=0.014 (Ekstrom+, 2012)
J/AJ/158/157 : Fairly bright slow rotators compositions (Monier+, 2019)
Byte-by-byte Description of file: table10.dat
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Bytes Format Units Label Explanations
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1- 8 F8.3 0.1nm WaveObs [3901/6682]? Observed wavelength, Angstroms
14- 21 F8.3 0.1nm WaveLab [3900/6681]? Laboratory wavelength, Angstroms
23- 27 A5 --- Ion Species identification
29- 34 A6 [-] loggf log, statistical weight*oscillator strength
36- 45 F10.3 eV Elow [0/281124]? Energy, lower level
47- 50 F4.2 --- Flux [0.13/0.99]? Relative Flux
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 09-Feb-2024