2015A&A...581A..88A


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST23:09:33

2015A&A...581A..88A - Astronomy and Astrophysics, volume 581A, 88-88 (2015/9-1)

The origin of fluorine: abundances in AGB carbon stars revisited.

ABIA C., CUNHA K., CRISTALLO S. and DE LAVERNY P.

Abstract (from CDS):

Revised spectroscopic parameters for the HF molecule and a new CN line list in the 2.3µm region have recently become available, facilitating a revision of the F content in asymptotic giant branch (AGB) stars. AGB carbon stars are the only observationally confirmed sources of fluorine. Currently, there is no consensus on the relevance of AGB stars in its Galactic chemical evolution. The aim of this article is to better constrain the contribution of these stars with a more accurate estimate of their fluorine abundances. Using new spectroscopic tools and local thermodynamical equilibrium spectral synthesis, we redetermine fluorine abundances from several HF lines in the K-band in a sample of Galactic and extragalactic AGB carbon stars of spectral types N, J, and SC, spanning a wide range of metallicities. On average, the new derived fluorine abundances are systematically lower by 0.33dex with respect to previous determinations. This may derive from a combination of the lower excitation energies of the HF lines and the larger macroturbulence parameters used here as well as from the new adopted CN line list. Yet, theoretical nucleosynthesis models in AGB stars agree with the new fluorine determinations at solar metallicities. At low metallicities, an agreement between theory and observations can be found by handling the radiative/convective interface at the base of the convective envelope in a different way. New fluorine spectroscopic measurements agree with theoretical models at low and at solar metallicity. Despite this, complementary sources are needed to explain its observed abundance in the solar neighbourhood.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: abundances - nuclear reactions, nucleosynthesis, abundances

Errata: + corrigendum vol. 584, p. C1

Simbad objects: 44

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Number of rows : 44

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* WZ Cas C* 00 01 15.8567004789 +60 21 19.023491384 8.77 9.47 9.40     C-N7III: 299 0
2 V* VX And C* 00 19 54.0156326103 +44 42 33.898137380   12.23 7.80     C-J4.5 147 0
3 NAME GM 780 C* 00 35 37.2630867960 -73 09 56.216428869     16.760   14.235 C 16 1
4 BMB-B 30 C* 00 49 32.6327331810 -73 17 52.448987105   17.61 15.30   13.43 C 21 0
5 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9440 1
6 V* Z Psc C* 01 16 05.0295407752 +25 46 09.695709530 12.85 9.46 6.84     C-N5 163 0
7 V* R Scl C* 01 26 58.0946233986 -32 32 35.437732667 17.26 9.59 5.72 3.69 2.30 C-N5+ 297 0
8 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5665 1
9 V* U Cam C* 03 41 48.1762532767 +62 38 54.397016016   11.5 11.00     C-N5 230 0
10 V* ST Cam C* 04 51 13.3478339517 +68 10 07.646494913   9.77 9.20     C-N5 136 0
11 V* R Lep C* 04 59 36.3480393629 -14 48 22.511432606 15.06 13.51 7.76 4.90 3.42 C7,6e 315 0
12 V* GP Ori S* 05 02 48.0660273400 +15 19 12.667051210   11.95 12.20     SC7/8 91 0
13 V* W Ori C* 05 05 23.7201883024 +01 10 39.459119918 16.36 9.52 6.10 3.83 2.35 C-N5 272 0
14 MSX LMC 310 C* 05 20 19.3880413662 -66 35 47.798268030       17.567 14.825 C 22 0
15 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14826 1
16 V* Y Tau C* 05 45 39.4116657307 +20 41 42.150008983 15.71 9.90 6.90 4.69 3.19 C-N5- 211 1
17 V* TU Gem C* 06 10 53.1008 +26 00 53.354     9.40     C-N5+ 110 0
18 V* FU Mon S* 06 22 23.8510657225 +03 25 27.893619723 16.86 12.36 9.06     S6.5/7.5 108 1
19 V* BL Ori C* 06 25 28.1733900221 +14 43 19.186665187 11.64 8.31 6.00 4.28 2.98 C-N5- 189 0
20 V* UU Aur C* 06 36 32.8375658812 +38 26 43.833646997   7.89 5.25 3.31 1.90 C-N5- 290 1
21 NAME Carina dSph G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 991 0
22 [MCA82] C3 C* 06 41 41.4412233339 -50 58 08.067077716   18.43 17.48 15.86 15.48 C 13 0
23 [MCA82] C4 C* 06 41 44.4719019678 -51 00 20.914017530           C 10 0
24 V* W CMa C* 07 08 03.4363216943 -11 55 23.793216538 13.44 8.98 6.56 4.86 3.51 C-N5 110 0
25 V* X Cnc C* 08 55 22.8824572992 +17 13 52.585346790   9.63 6.40 4.29 2.90 C-N4.5 256 1
26 V* Y Hya C* 09 51 03.7183623740 -23 01 02.359218355 17.75 10.45 6.63     C-N4.5III: 100 0
27 V* U Hya C* 10 37 33.2729535 -13 23 04.352923 13.29 7.51 4.82 3.05 1.78 C-N5 283 0
28 V* VY UMa C* 10 45 04.0305145913 +67 24 40.983504682 12.91 8.34 5.95 4.20 2.94 C-N5 189 0
29 V* SS Vir C* 12 25 14.3952079722 +00 46 10.946733968 15.84 10.79 6.60     C-N4.5: 191 1
30 V* Y CVn C* 12 45 07.8257032577 +45 26 24.898861195 14.03 7.41 4.87 3.12 1.74 C-N5 461 0
31 V* RY Dra C* 12 56 25.9123940873 +65 59 39.809927879 15.56 9.44 6.34 4.34 2.91 C-N3III: 223 0
32 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2131 0
33 V* TW Oph C* 17 29 43.6641693394 -19 28 22.867073875   12.95 8.79 7.54 8.70 C-N5 107 0
34 V* T Lyr C* 18 32 20.0770614691 +36 59 55.619287018   12.74 7.84 7.30   C-J4:p 171 1
35 V* S Sct C* 18 50 20.0367524071 -07 54 27.430964220 13.93 9.89 6.80     C-N5 194 0
36 V* V Aql C* 19 04 24.1548619887 -05 41 05.434251344   11.09 6.90     C-N5 202 0
37 V* UX Dra C* 19 21 35.5158242859 +76 33 34.549597671   8.81 5.94     C-N5 186 0
38 V* AQ Sgr C* 19 34 18.9945475487 -16 22 27.048908541 13.85 9.48 6.70     C-N5 107 0
39 V* RT Cap C* 20 17 06.5288478069 -21 19 04.462721142   12.92 8.90     C6,4 113 0
40 V* CY Cyg S* 20 46 50.2447575410 +46 03 06.929987868   10.82 11.00     SC2_Zr0 52 0
41 V* V460 Cyg C* 21 42 01.0831986858 +35 30 36.713658662 12.97 8.32 5.84 4.10 2.71 C-N5 198 1
42 V* RV Cyg C* 21 43 16.3283644053 +38 01 02.977478786   12.01 10.80     C-N5: 122 0
43 V* RZ Peg Mi* 22 05 52.9711216769 +33 30 24.810194832   11.40 7.60     SC5-9/9-e 145 0
44 * 19 Psc C* 23 46 23.5126056542 +03 29 12.505415198 10.95 7.62 5.02 3.19 1.82 C-N6 432 0

    Equat.    Gal    SGal    Ecl

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2020.07.03-23:09:33

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