1997A&A...321L...9B


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.19CEST18:00:09

1997A&A...321L...9B - Astronomy and Astrophysics, volume 321, L9-12 (1997/5-1)

The barium stars in the Hertzsprung-Russel diagram.

BERGEAT J. and KNAPIK A.

Abstract (from CDS):

We present absolute magnitudes for a sample of 52 barium stars observed by the HIPPARCOS satellite, and their location in the HR diagram. Our plot (Fig. 1) is restricted to stars with parallax accuracies better than 22%. The luminosity classes range from Ib supergiants down to V dwarfs on the main sequence, as expected from spectral classificaiton. Discrepancies are however notes. No gap is observed in the region extending from the main sequence to the giant branch, excatly as shown by Perryman et al. (1995A&A...304...69P) for normal stars. This is also true for class II bright giants. A clump is however obvious at G8-K0 IIIb and MV∼0. 85 which correspond to the one noted as (B-V)∼1.0 and MHp∼1.0 by Perryman et al. It appears that barium stars on the main sequence are earlier than G4, upward evolution being noticeable for later types. They are also distributed in the subgiant zone following the locus of normal stars, i.e. increasing brightness for later types. A few stars in our sample are also classified as CH stars: four of them are definitely main sequence class V-dwarfs, one is a class IVb faint subgiant while two possible CH-stars are class III-giants. These results are consistent with the currently-admitted model of surface pollution of a normal star through mass transfer in a binary system whose primary has become a white dwarf (WD). HIPPARCOS data show perturbations of the astrometric solution which can be attributed to proved (or possible) binarity for 21 stars our of 121, and 8 of them were already quoted in the CCDM catalogue (not necessarily with a WD component). This low proportion can be explained by the 5-11 magnitudes differences predicted between the two components and/or low angular separation with periods close to one year.

Abstract Copyright:

Journal keyword(s): stars: HR diagram - stars: chemically peculiar - stars: evolution

VizieR on-line data: <Available at CDS (J/A+A/321/L9): table1 table2 tables.tex>

Simbad objects: 35

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Number of rows : 35

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 * ups02 Cas Pe* 00 56 39.9041301647 +59 10 51.800571997   5.581 4.622     G8.5IIIbFe-0.5 208 0
2 HD 11658 Pe* 01 55 46.9099892986 +51 41 17.326846361   8.36 7.25     K0 35 1
3 HD 16458 Pe* 02 47 47.7322966372 +81 26 54.517420201   7.091 5.781     K1Ba5 151 0
4 HD 30554 Pe* 04 37 15.3966249518 -79 27 33.254123904   9.07 7.98     G8/K0pBa 25 0
5 HD 36650 Pe* 05 27 42.9237140014 -68 04 27.097907074   9.91 8.79     K0III 38 0
6 V* HR CMa Al* 06 32 46.8721481683 -11 09 58.968732064 8.12 7.35 6.24 5.49 5.01 G9III:Ba3.5 167 0
7 HD 50264 SB* 06 51 12.5072805598 -29 34 32.322886486   9.63 9.05     G1.5II-III:_Ba2_CH0.5 44 0
8 HD 50082 SB* 06 51 53.9593511415 +06 36 24.508450962   8.46 7.42     K0_Ba3 50 1
9 HD 51959 SB* 06 59 10.0956577371 -07 06 32.024342810   10.05 8.92     K1IIIBa1 35 0
10 * 12 Pup Pe* 07 59 05.7144573705 -23 18 37.429253195 7.15 6.23 5.11     G9IIa 79 0
11 HD 65854 Pe* 08 03 32.3693898762 +54 09 35.181289082   9.37 8.40     K0 38 0
12 * 55 Cam Pe* 08 12 48.7879059457 +68 28 26.672410010   6.352 5.329     G7IIb 95 0
13 HD 77912 Pe* 09 06 31.7685981338 +38 27 07.975612689   5.567 4.539     G7IIa 151 0
14 * y Vel Pe* 09 38 01.4522425087 -43 11 27.365564591 7.18 6.50 5.50     G8IIIBa1.5 117 0
15 HD 87080 SB* 10 02 00.8598789132 -33 41 06.508653916   10.15 9.37     G6III_Ba5.5_CH 45 0
16 HD 89175 Pe* 10 15 46.6266633743 -52 38 37.363374125 9.53 8.85 7.73     G8Ib/II 43 0
17 HD 92626 SB* 10 40 49.9681151809 -48 01 30.407389734 9.53 8.44 7.09     K0_Ba5 81 0
18 * 58 Leo ** 11 00 33.6475277060 +03 37 02.989587907   6.007 4.838     K0.5IIIFe-0.5 152 0
19 HD 101013 SB* 11 37 53.0007631393 +50 37 05.472894065   7.200 6.113     G9:IIIb:Ba2.5 134 0
20 HD 104059 Pe* 11 58 53.9473178394 -43 38 47.564748504   9.42 9.08     F2V 23 0
21 * omi Vir PM* 12 05 12.5404884 +08 43 58.749788 5.75 5.11 4.12 3.38 2.89 G8IIICN0.5CH1Ba1 267 0
22 HD 111315 Pe* 12 49 44.9594073718 -71 59 10.465079304   6.698 5.543     G7IIIBa1 44 0
23 HD 116713 Pe* 13 26 07.7990298137 -39 45 18.456410720 7.31 6.29 5.09     K0.5IIIbBa3 128 0
24 HD 123585 SB* 14 09 35.7952107527 -44 22 01.195989267   9.75 9.23     G0III_Ba3_CH 56 0
25 HD 127392 SB* 14 31 53.5048540916 -31 12 01.949907779   10.323 9.678 9.16 9.02 G2IIIBa4 38 0
26 * 16 Ser SB* 15 36 29.5749786777 +10 00 36.557426427   6.217 5.253     K0III:CN1Ba0.7Sr2 197 0
27 HD 168214 Pe* 18 20 26.8342744645 -40 16 21.683868575   8.85 7.95     G6pBa 33 0
28 HD 175674 * 18 58 52.9900555757 -48 30 21.272665233   8.03 6.64     K3III_Ba 45 1
29 HD 199394 SB* 20 55 09.1166220082 +46 21 00.569087871   8.001 6.984     K0III 62 0
30 * zet Cyg SB* 21 12 56.1859347 +30 13 36.895667 4.96 4.20 3.21 2.52 2.04 G8+III-IIIaBa0.5 323 0
31 * zet Cap SB* 21 26 40.0263390 -22 24 40.804197 5.35 4.75 3.74 3.09 2.65 G4Ib:Ba2 266 1
32 HD 205011 SB* 21 31 50.1440984214 +23 50 42.551089035   7.50 6.42     G9+IIIaBa1+ 67 0
33 * eps Peg LP* 21 44 11.1561394 +09 52 30.031152 5.61 3.91 2.39 1.34 0.58 K2Ib-II 432 0
34 HD 207585 SB* 21 50 34.7148686140 -24 11 11.644531121   10.50 9.78     G2II:Ba1.5CH1Fe-1 42 0
35 * 56 Peg SB* 23 07 06.7390851 +25 28 05.732922 7.20 6.06 4.74 3.74 3.07 K0.5II:Ba1CN-2CH-0.5 251 0

    Equat.    Gal    SGal    Ecl

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2020.10.19-18:00:09

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