J/MNRAS/537/3054 15 Vul, an evolved Am star, abundances (Cay+, 2025)
A critical evaluation of the elemental abundances and evolutionary status of
15 Vul (HD 189849): the first identification of an evolved Am star.
Cay M.T., Cay I.H., Civelekler B.
<Mon. Not. R. Astron. Soc. 537, 3054-3065 (2025)>
=2025MNRAS.537.3054C 2025MNRAS.537.3054C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, Am ; Abundances, peculiar; Equivalent widths
Keywords: stars: abundances - stars, atmospheres - stars, chemically peculiar -
stars: evolution - stars: individual: 15 Vul (HD 189849)
Abstract:
Understanding the evolution of metallic-line (Am) stars requires well
determined atmospheric parameters and abundance patterns of the
selected candidates. In this study, we presented a detailed abundance
analysis of 15 Vul (HD 189849), identified as a marginal star, using a
combination of equivalent width and spectrum synthesis techniques,
under the LTE assumption. We compared our findings to previous
analyses of the star, providing critique on both their results and our
own. Our results suggest that although 15 Vul exhibits some
underabundances of calcium and scandium, which are typically
associated with stars, it might be more accurately identified as a
normal A star in terms of its abundance pattern of all other elements
and microturbulence velocity. The stars position on the HR diagram,
along with our findings, may indicate that it is potentially a
classical star that has evolved into the subgiant phase as a
quasi-normal star. This may be the first identification of an evolved
star.
Description:
The table presents abundance results (relative to the Sun), obtained
from either equivalent widths or spectrum synthesis, on a line-by-line
basis for 15 Vul (HD 189849).
Objects:
------------------------------------------------
RA (2000) DE Designation(s)
------------------------------------------------
20 01 06.04 +27 45 12.8 15 Vul = HD 189849
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 48 231 The lines and the related data used in the
analysis with individual abundance results
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Ion Symbol of the ion
7- 14 F8.3 0.1nm lambda Wavelenght of the line (in Angstroem)
16 A1 --- r_HFS References to HFS data (1)
18- 23 F6.3 eV LEP Low Excitation Potential
25- 30 F6.3 [-] loggf Logarithm of weighted oscillator strength
32- 33 A2 --- Method Method of analysis
(Equivalent Width or Spectrum Synthesis)
35- 39 F5.2 0.1pm EW ? Equivalent width (in miliAngstroem)
41- 45 F5.2 --- [Nel/H] Abundance relative to Sun.
[Nel/H]=log(Nel/H)star-log(Nel/H)sun
47- 48 A2 --- r_loggf References to loggf data (1)
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Note (1): References as follows:
References to HFS data:
a = 1995KurCD..23.....K 1995KurCD..23.....K
b = 2014ApJS..214...18W 2014ApJS..214...18W
c = 2011PhyS...84e5301A 2011PhyS...84e5301A
d = 2011ApJS..194...35D 2011ApJS..194...35D
e = 2000AJ....120.2513P 2000AJ....120.2513P
f = 1991PhRvA..43.4824D 1991PhRvA..43.4824D
References to log_gf data:
1 = 1995PhRvA..52.4316Y 1995PhRvA..52.4316Y
2 = Kramida A. et al., https://physics.nist.gov/asd (ver. 5.9)
3 = Ralchenko Y.et al. https://physics.nist.gov/asd (ver. 4.0.0)
4 = 1995KurCD..23.....K 1995KurCD..23.....K
5 = Kurucz R. L., 2007, http://kurucz.harvard.edu/linelists.html
6 = Kramida A. et al., https://physics.nist.gov/asd (ver. 5.11)
7 = 1993A&AS..102..435B 1993A&AS..102..435B
8 = Kurucz R. L., 2004, http://kurucz.harvard.edu/linelists.html
9 = 1975A&A....38....1S 1975A&A....38....1S
10 = 1981JPhB...14.4015S 1981JPhB...14.4015S
11 = 1994MNRAS.266..805S 1994MNRAS.266..805S
12 = 2019ApJS..241...21L 2019ApJS..241...21L
13 = 2013ApJS..205...11L 2013ApJS..205...11L
14 = 2013ApJS..208...27W 2013ApJS..208...27W
15 = 1993A&A...273..707B 1993A&A...273..707B
16 = 2014ApJS..214...18W 2014ApJS..214...18W
17 = Kurucz R. L., 2010, http://kurucz.harvard.edu/linelists.html
18 = 2007ApJ...667.1267S 2007ApJ...667.1267S
19 = 1988JPCRD..17S....F 1988JPCRD..17S....F
20 = 2017ApJS..228...10L 2017ApJS..228...10L
21 = 2011ApJS..194...35D 2011ApJS..194...35D
22 = 2006JPCRD..35.1669F 2006JPCRD..35.1669F
23 = Kurucz R. L., 2008, http://kurucz.harvard.edu/linelists.html
24 = 2014ApJS..211...20W 2014ApJS..211...20W
25 = 1988JPCRD..17S....F 1988JPCRD..17S....F
26 = Kurucz R. L., 2003, http://kurucz.harvard.edu/linelists.html
27 = 1968ZA.....69..180K 1968ZA.....69..180K
28 = 1968MNRAS.140...53W 1968MNRAS.140...53W
29 = 1969MNRAS.142...71L 1969MNRAS.142...71L
30 = 1982ApJ...261..736H 1982ApJ...261..736H
31 = 1986JQSRT..35..383P 1986JQSRT..35..383P
32 = 2006A&A...456.1181L 2006A&A...456.1181L
33 = 2001ApJ...556..452L 2001ApJ...556..452L
34 = 2009ApJS..182...51L 2009ApJS..182...51L
35 = 2003ApJS..148..543D 2003ApJS..148..543D
36 = 1975tsip.book.....M 1975tsip.book.....M
37 = 2006ApJS..162..227L 2006ApJS..162..227L
38 = 2001ApJ...563.1075L 2001ApJ...563.1075L
G = Guess/inverse analysis
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Acknowledgements:
M. Taskin Cay, taskin(at)istanbul.edu.tr
(End) Patricia Vannier [CDS] 16-Jan-2025