2023A&A...671A..97E


Query : 2023A&A...671A..97E

2023A&A...671A..97E - Astronomy and Astrophysics, volume 671A, 97 (2023/3-1)

Barium and related stars, and their white-dwarf companions III. The masses of the white dwarfs.

ESCORZA A. and DE ROSA R.J.

Abstract (from CDS):

Context. Masses are one of the most difficult stellar properties to measure. In the case of the white-dwarf (WD) companions of Barium (Ba) stars, the situation is worse. These stars are dim, cool, and difficult to observe via direct methods. However, Ba stars were polluted by the asymptotic giant branch (AGB) progenitors of these WDs with matter rich in heavy elements, and the properties of their WD companions contain key information about binary interaction processes involving AGB stars and about the slow neutron capture process (s-process) of nucleosynthesis.
Aims. With this study, we aim to determine accurate and assumption-free masses for the WD companions of as many Ba stars as possible. We want to provide new observational constraints that can help us learn about the formation and evolution of these post-interaction binary systems and about the nucleosythesis processes that took place in the interiors of their AGB progenitors.
Methods. We combined archival radial-velocity data with HIPPARCOS and Gaia astrometry using the software package ORVARA, a code designed to simultaneously fit a single Keplerian model to any combination of these types of data using a parallel-tempering Markov chain Monte Carlo method. We adopted Gaussian priors for the Ba star masses and for the parallaxes, and assumed uninformative priors for the orbital elements and the WD masses.
Results. We determined new orbital inclinations and companion masses for 60 Ba star systems. These results include a couple of new orbits and several improved orbits for the longest-period systems. Additionally, we unravelled a new triple system that was not known before and constrained the orbits and the masses of the two companions.
Conclusions. The WD mass distribution presented in this work is compatible with that of field WDs and with the distributions published before for Ba star companions. A few WD companions have masses higher than 0.8 M, considering 1-σ uncertainties. This indicates that they might come from AGB stars that are more massive than 3 M. These masses are higher than what the abundance ratios on Ba star atmospheres and theoretical models of the s-process of nucleosynthesis seem to expect, raising interesting questions about the formation of these systems.

Abstract Copyright: © The Authors 2023

Journal keyword(s): white dwarfs - stars: late-type - binaries: close - stars: chemically peculiar - astrometry - stars: evolution

Simbad objects: 61

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Number of rows : 61
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 HD 2454 SB* 00 28 20.0424818616 +10 11 23.297664120   6.47   5.8   F5VSr 177 0
2 HD 5424 SB* 00 55 43.9284269928 -27 53 37.262442120   10.558 9.517 9.690   G8II 54 1
3 HD 16458 SB* 02 47 47.7257592048 +81 26 54.505744152   7.091 5.781     K1Ba5 162 0
4 HD 18182 SB* 02 55 11.0938072080 -04 18 59.871586536   10.02 8.97     G8/K0III 32 0
5 HD 20394 SB* 03 16 53.5805786568 +02 20 21.666453072   9.81 8.74     G9-IIIa:Ba2.5 46 0
6 HD 24035 SB* 03 43 42.5926451400 -72 36 32.798908692 9.70 9.74 8.51     K2:IIICN2Ba3CH4C21- 52 0
7 HD 27271 SB* 04 18 33.8242867776 +02 28 13.904303880   8.53 7.52     G8II 55 0
8 HD 31487 SB* 04 59 03.7278166656 +51 56 32.031317148   9.47 8.12     G8IIIBa3 52 0
9 HD 34654 SB* 05 23 39.8694572352 +64 07 29.106281496       7.0   F8 40 0
10 HD 40430 SB* 05 58 20.3999304048 -10 52 29.143536600 9.77 9.08 8.07     K0Ba1 40 0
11 HD 43389 SB* 06 15 47.0680552296 -02 23 08.240872344 11.26 9.80 8.32     K0/1IIICNIIp 49 1
12 HD 44896 SB* 06 22 53.7688341288 -33 36 52.569603216 10.79 8.90 7.27     K4.5IIIa:Ba4 60 0
13 HD 49641 s*r 06 49 29.4486633888 +03 41 30.139837368   8.47 7.12     K0Ib 51 0
14 HD 49841 SB* 06 50 38.9708742360 +05 39 46.333599588   9.60 8.60     G5 33 0
15 HD 50264 SB* 06 51 12.5032525968 -29 34 32.306464056   9.63 9.05     G1.5II-III:_Ba2_CH0.5 52 0
16 HD 50082 SB* 06 51 53.9588741976 +06 36 24.481624140   8.46 7.42     K0_Ba3 56 1
17 HD 51959 SB* 06 59 10.0961767488 -07 06 32.033021256   10.05 8.92     K1IIIBa1 46 0
18 HD 53199 SB* 07 04 48.2850310560 +13 14 19.215205260   10.06 9.07     G5 36 0
19 HD 58121 SB* 07 24 28.4375517552 +06 09 00.910843452   9.08 7.91     K1III 49 0
20 HD 58368 SB* 07 25 38.9680339992 +07 33 39.044806524   9.01 7.99     K0 56 0
21 HD 59852 SB* 07 31 46.5552500136 -04 21 35.292643992   9.59 8.70     G8III 36 0
22 BD-14 2678 SB* 08 51 55.5620549304 -14 39 09.388237284   10.781 9.849     K5 37 0
23 V* PV UMa SB* 09 03 32.2721549112 +53 06 29.817440280   7.86 6.86     G7III:Ba0.5 73 0
24 HD 87080 SB* 10 02 00.8591714448 -33 41 06.504849924   10.15 9.37     G6III_Ba5.5_CH 52 0
25 HD 88562 SB* 10 12 29.9425836816 -15 53 23.272044576   10.06 8.52     K1III 44 0
26 HD 91208 SB* 10 31 33.1354556736 -17 04 35.530762296   8.96 8.03     KpBa 42 0
27 HD 92626 SB* 10 40 49.9724755488 -48 01 30.370319904 9.53 8.44 7.09     K0_Ba5 92 0
28 HD 95193 SB* 10 59 26.7756769752 -14 10 17.739172596   9.27 8.28     G8Ib/II 39 0
29 HD 95241 SB* 11 00 20.6841801504 +42 54 42.127624548       5.7   F9V 108 0
30 * lam Crt SB* 11 23 21.8814666155 -18 46 48.128136896   5.51 5.09     F5III 115 0
31 * omi Vir SB* 12 05 12.5318326945 +08 43 58.866875781 5.75 5.11 4.12 3.38 2.89 G8IIICN0.5CH1Ba1 286 0
32 HD 107541 SB* 12 21 48.0763383264 -34 46 48.132220188 11.00 10.45 9.39     G9IIIBa8 51 0
33 HD 107574 SB* 12 21 51.8609784600 -18 24 00.253490832   8.99 8.54     F3IV/V 52 0
34 HD 119185 SB* 13 41 57.5120926632 -13 01 39.811506996   9.87 8.91     G8III(pBa) 46 0
35 HD 121447 SB* 13 55 46.9655016048 -18 14 56.486226336 11.50 9.61 7.80     C2,1_CH4:_Ba4 123 0
36 HD 123585 SB* 14 09 35.7949041768 -44 22 01.166065032   9.75 9.23     G0III_Ba3_CH 65 0
37 HD 123949 SB* 14 10 59.3114487936 -19 08 38.227483320 11.40 10.10 8.70     K1pBa 47 0
38 HD 127392 SB* 14 31 53.5081721928 -31 12 01.967602860   10.323 9.678 9.16 9.02 G2IIIBa4 49 0
39 BD-11 3853 SB* 15 00 30.9385017840 -12 26 56.702214888   10.826 10.249 10.266 9.744 Fwl 48 0
40 * 16 Ser SB* 15 36 29.5738934952 +10 00 36.529391340   6.217 5.253     K0III:CN1Ba0.7Sr2 207 0
41 HD 143899 SB* 16 03 43.8067112448 -19 34 30.730124064   9.35 8.30     G8IIBa1 39 0
42 BD-10 4311 SB* 16 24 13.1941511520 -11 13 06.510639216   10.48 9.88     G0Ba1 39 0
43 HD 178717 SB* 19 09 22.0095424584 +10 14 28.239748008   9.05 7.14     K3.5III:Ba4+ 114 0
44 HD 180622 SB* 19 17 11.0284324944 +00 29 50.518905540   8.85 7.63     G8/K0Ib 31 0
45 HD 182274 SB* 19 23 12.5370443112 +19 22 31.296222048   8.25 7.80     F6V 70 0
46 HD 183915 SB* 19 31 25.5039458808 +11 37 40.623930768   8.65 7.29     K0III:Ba3.5 81 0
47 HD 199939 SB* 20 58 43.4942605752 +44 24 52.482256560   8.74 7.44     G9III:Ba4 86 0
48 HD 200063 SB* 21 01 04.0446659928 +01 02 05.721877680   8.75 7.20     K2II 33 0
49 HD 201657 SB* 21 10 33.5317271064 +16 58 46.441088616   9.24 8.00     K2 48 0
50 HD 201824 SB* 21 12 17.5834473576 -08 21 24.856045164   10.05 8.94     GpBa 40 0
51 HD 202400 SB* 21 19 38.2926039648 -70 04 42.184981956   9.57 9.18     ApSr 31 0
52 * zet Cap SB* 21 26 40.0306553034 -22 24 40.753242596 5.35 4.75 3.74 3.09 2.65 G4Ib:Ba2 280 1
53 HD 205011 SB* 21 31 50.1446031000 +23 50 42.585987624   7.50 6.42     G9+IIIaBa1+ 75 0
54 HD 207585 SB* 21 50 34.7136512016 -24 11 11.686804584   10.50 9.78     G2II:Ba1.5CH1Fe-1 50 0
55 HD 210946 SB* 22 13 50.1526144464 +01 36 32.146407792   9.13 8.08     G8/K0Ib/II 37 0
56 HD 211594 SB* 22 18 14.9455545024 -05 50 29.853913416   9.21 8.07     G4IIIBa4 73 0
57 HD 216219 SB* 22 50 52.1530053936 +18 00 07.703208072   8.06 7.44     G1II-III:Fe-1CH0.5 119 0
58 * 56 Peg SB* 23 07 06.7418870416 +25 28 05.773861158 7.20 6.06 4.74 3.74 3.07 K0.5II:Ba1CN-2CH-0.5 262 0
59 HD 218396 El* 23 07 28.7157209544 +21 08 03.310767492   6.21 5.953     F0+VkA5mA5 1141 0
60 HD 221531 SB* 23 32 59.0181370178 -11 59 15.468643976   8.79 8.37     F5VSr 38 0
61 HD 224621 SB* 23 59 17.3099307864 -36 02 36.508989480   10.18 9.55     G0III/IV 29 0

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