2019A&A...626A.128E


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST06:49:33

2019A&A...626A.128E - Astronomy and Astrophysics, volume 626A, 128-128 (2019/6-1)

Barium and related stars, and their white-dwarf companions. II. Main-sequence and subgiant starss.

ESCORZA A., KARINKUZHI D., JORISSEN A., SIESS L., VAN WINCKEL H., POURBAIX D., JOHNSTON C., MISZALSKI B., OOMEN G.-M., ABDUL-MASIH M., BOFFIN H.M.J., NORTH P., MANICK R., SHETYE S. and MIKOLAJEWSKA J.

Abstract (from CDS):

Barium (Ba) dwarfs and CH subgiants are the less evolved analogues of Ba and CH giants. They are F- to G-type main-sequence stars polluted with heavy elements by their binary companions when the companion was on the asymptotic giant branch (AGB). This companion is now a white dwarf that in most cases cannot be directly detected. We present a large systematic study of 60 objects classified as Ba dwarfs or CH subgiants. Combining radial-velocity measurements from HERMES and SALT high-resolution spectra with radial-velocity data from CORAVEL and CORALIE, we determine the orbital parameters of 27 systems. We also derive their masses by comparing their location in the Hertzsprung-Russell diagram with evolutionary models. We confirm that Ba dwarfs and CH subgiants are not at different evolutionary stages, and that they have similar metallicities, despite their different names. Additionally, Ba giants appear significantly more massive than their main-sequence analogues. This is likely due to observational biases against the detection of hotter main-sequence post-mass-transfer objects. Combining our spectroscopic orbits with the HIPPARCOS astrometric data, we derive the orbital inclination and the mass of the WD companion for four systems. Since this cannot be done for all systems in our sample yet (but should be possible with upcoming Gaia data releases), we also analyse the mass-function distribution of our binaries. We can model this distribution with very narrow mass distributions for the two components and random orbital orientations on the sky. Finally, based on BINSTAR evolutionary models, we suggest that the orbital evolution of low-mass Ba systems can be affected by a second phase of interactions along the red giant branch of the Ba star, which impact the eccentricities and periods of the giants.

Abstract Copyright: © ESO 2019

Journal keyword(s): stars: late-type - stars: chemically peculiar - binaries: spectroscopic - techniques: imaging spectroscopy

VizieR on-line data: <Available at CDS (J/A+A/626/A128): stars.dat rvdata.dat>

Status at CDS:   Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 63

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Number of rows : 63

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 HD 2454 PM* 00 28 20.0441170647 +10 11 23.308682092   6.47   5.8   F5VSr 162 0
2 HD 6434 PM* 01 04 40.1503743342 -39 29 17.585568452   8.32 7.71     G2/3V 202 1
3 HD 9529 * 01 31 02.2244284385 -70 36 52.153974555   9.63 9.739     F6(IIIp) 10 0
4 BD-18 255 SB* 01 33 17.4293955269 -18 12 40.274504581   10.642 10.190     ~ 15 0
5 * eta Ari PM* 02 12 48.0856782200 +21 12 39.577562642       5.0   F5V 173 0
6 HD 15306 SB* 02 27 51.2059125950 -00 47 22.210696882   9.28 8.92 8.7   Fm_dD 22 0
7 HD 18853 PM* 02 58 10.1825084602 -67 22 31.862462071   8.96 8.49     F6III 8 0
8 HD 22589 SB* 03 37 55.2476467353 -06 58 28.329379028   9.72 9.00     G5II 24 0
9 HD 24864 SB* 03 54 25.3308989166 -54 32 01.168052417   9.54 9.08     F5(IVp) 9 0
10 HD 26455 * 04 08 28.3731458158 -52 50 06.105879363   10.104 9.838     F3IV(p) 10 0
11 CCDM J04545-6025AB ** 04 54 30.53079 -60 24 51.4209   9.05 8.69     F2II/IIIm 10 1
12 HD 34654 SB* 05 23 39.8869781357 +64 07 29.047003244       7.0   F8 30 0
13 * 111 Tau BY* 05 24 25.4629773342 +17 23 00.729080928   5.52   4.7   F8V 316 0
14 HD 48565 SB* 06 44 54.9136936802 +20 51 38.350227797   7.746 7.183     hF8gF8mF3 63 0
15 HD 50264 SB* 06 51 12.5072805598 -29 34 32.322886486   9.63 9.05     G1.5II-III:_Ba2_CH0.5 44 0
16 HD 60532 PM* 07 34 03.1802404179 -22 17 45.838378187 5.02 4.94 4.39     F6IV-V 198 1
17 HD 69578 * 08 12 43.61933 -68 21 27.8956   10.22 9.70     F6III 9 1
18 HD 76225 ** 08 54 00.8616289930 -26 54 56.385901380   9.73 9.20     F7/G+A(pSr) 32 0
19 * tet UMa PM* 09 32 51.4338939 +51 40 38.281102 3.67 3.64 3.18 2.74 2.47 F7V 386 0
20 HD 87080 SB* 10 02 00.8598789132 -33 41 06.508653916   10.15 9.37     G6III_Ba5.5_CH 45 0
21 HD 89948 SB* 10 22 21.8602764847 -29 33 21.560135988 8.12 8.11 7.55     G2IIIBa1 70 0
22 HD 92545 Pe* 10 40 57.7072314402 -12 11 44.223424837   9.07 9.149 8.25 9.047 F7IV 39 0
23 HD 95241 SB* 11 00 20.6841810770 +42 54 42.128367961       5.7   F9V 93 0
24 * lam Crt SB* 11 23 21.8772519050 -18 46 48.090929720   5.51 5.09     F5III 101 0
25 HD 101581 PM* 11 41 02.4681810357 -44 24 18.682430854 9.753 8.833 7.762 7.127 6.584 K4.5Vk: 97 0
26 HD 103840 PM* 11 57 15.6529912614 -48 44 36.650886701   8.77 8.15     G3V 24 0
27 HD 104342 PM* 12 00 49.0662049247 -48 24 12.325548190   8.62 8.12     F6V 11 0
28 HD 105671 PM* 12 09 54.9816785086 -46 12 30.209114297 10.648 9.573 8.438 7.777 7.239 K4Vk: 67 0
29 HD 106191 SB* 12 13 11.3755973322 -15 13 56.425254721   10.73 10.08     F8/G1V 24 0
30 HD 107574 SB* 12 21 51.8580902959 -18 24 00.255862910   8.99 8.54     F3IV/V 45 0
31 HD 109490 * 12 35 21.5673178737 -44 34 02.073984987   10.28 9.87     F3IV 5 0
32 HD 113402 * 13 04 44.5792290969 -66 51 13.036963158   9.39 8.96     F5II/IV 9 0
33 HD 114520 SB* 13 10 52.3498584867 +21 14 01.495110446   7.28 6.82     F5IV-VSr 39 0
34 HD 117288 PM* 13 30 04.0333084205 -44 42 45.339451265   8.38 7.87     F6/7V 13 0
35 HD 120620 SB* 13 50 41.6581953890 -04 16 04.892212868   10.78 9.60     K0(III) 22 0
36 HD 123585 SB* 14 09 35.7952107527 -44 22 01.195989267   9.75 9.23     G0III_Ba3_CH 56 0
37 * 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 2133 0
38 * iot Vir PM* 14 16 00.8695049 -06 00 01.963348 4.64 4.60 4.08     F7III 334 0
39 HD 127392 SB* 14 31 53.5048540916 -31 12 01.949907779   10.323 9.678 9.16 9.02 G2IIIBa4 38 0
40 HD 130255 C* 14 47 02.0053629026 +01 23 35.326478646   9.69 8.64 8.1   G9VBa2 36 0
41 BD-11 3853 Pe* 15 00 30.9382902769 -12 26 56.698582793   10.819 10.247 9.92 9.744 ~ 39 0
42 HD 134698 Pe* 15 11 41.7014565757 -10 30 27.567122742   9.982 8.870     G8III 18 0
43 HD 141804 SB* 15 53 29.2418948912 -54 09 30.603522851   9.61 9.03     F8/G0II 18 0
44 HD 146800 PM* 16 20 17.9728584326 -48 13 32.887754899   9.87 8.89     K2.5V 52 0
45 HD 147609 SB* 16 21 51.9861832532 +27 22 27.191800307   9.69 9.18     G5 24 0
46 BD-10 4311 SB* 16 24 13.1947678978 -11 13 06.512142071   10.48 9.88     G0Ba1 31 0
47 HD 150862 ** 16 44 44.0888580876 -25 12 59.338279935   9.72 9.19     F7V+A(pSr) 27 0
48 HD 156365 PM* 17 18 07.1354097841 -24 04 22.881060858   7.27 6.59     G3V 72 0
49 HD 170149 PM* 18 30 04.3792115722 -43 50 02.262689553   7.56 7.10     F5/6IV 20 0
50 HD 177996 PM* 19 08 50.4827467870 -42 25 41.233817269   8.74 7.88     K1V 49 0
51 HD 182274 SB* 19 23 12.5376833059 +19 22 31.290411216   8.25 7.80     F6V 63 0
52 HD 188985 Pe* 19 59 58.2969528328 -48 58 31.180568493   9.07 8.56     G2III_Ba1 41 0
53 CD-62 1346 Pe* 21 06 02.9221670307 -61 33 44.645933103   10.55 9.85 9.56 9.027 CEMP-s 48 0
54 HD 202400 Pe* 21 19 38.2960623584 -70 04 42.249943843   9.57 9.18     ApSr 22 0
55 HD 205156 PM* 21 34 50.9655517316 -49 47 35.025504757   8.74 8.16     G3V 78 0
56 HD 207585 SB* 21 50 34.7148686140 -24 11 11.644531121   10.50 9.78     G2II:Ba1.5CH1Fe-1 42 0
57 HD 216219 Pe* 22 50 52.1514570495 +18 00 07.749391635   8.06 7.44     G1II-III:Fe-1CH0.5 105 0
58 HD 219899 PM* 23 19 48.2830593807 -41 57 49.838804704   8.66 8.08     F8V 18 0
59 * 12 And PM* 23 20 53.2636166052 +38 10 56.362398270   6.212 5.765     F5V 90 0
60 HD 221531 SB* 23 32 59.0231753159 -11 59 15.513937449   8.74 8.36     F5VSr 31 0
61 HD 222349 PM* 23 40 00.9452477085 -56 44 26.199316436   9.70 9.22     G5/K0+A/F(Sr) 31 0
62 BD+18 5215 SB* 23 46 56.0386405439 +19 28 22.131367910   10.18 9.68     F/Gp 22 0
63 HD 224621 PM* 23 59 17.3112209738 -36 02 36.528887557   10.18 9.55     G0III/IV 21 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-06:49:33

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