2001A&A...377..123G


Query : 2001A&A...377..123G

2001A&A...377..123G - Astronomy and Astrophysics, volume 377, 123-123 (2001/10-1)

Non-interacting main-sequence binaries with different chemical compositions: Evidences of infall of rocky material?

GRATTON R.G., BONANNO G., CLAUDI R.U., COSENTINO R., DESIDERA S., LUCATELLO S. and SCUDERI S.

Abstract (from CDS):

We performed a careful differential abundance analysis of individual components of six main sequence binaries with separations of a few hundreds of AU. To reduce analysis concerns, we selected systems with almost equal mass components. We were able to derive differential abundances of several elements with errors down to 0.01dex in the best cases. We found that in four systems the two components have the same chemical composition, within these very severe limits. However, clear differences were found for the two remaining systems (HD 219542 and HD 200466), in both cases the primaries being more Fe-rich than the secondaries, by 0.091±0.009 and 0.053±0.024dex respectively. Similar differences were found for most of the elements considered in our analysis; however, we found no appreciable difference for volatile elements and a trend for increasing abundance differences with increasing condensation temperature for individual elements, a result similar to that found for some single stars with planets by Smith et al. (2001AJ....121.3207S). Finally, we note that HD 219542A has a Li-abundance comparable to those of Li-rich stars in old open clusters, while no Li is detected in the slightly cooler HD 219542B. We suggest that the primaries of these two systems have accreted rocky planets or the inner dust-rich part of a protoplanetary disk, likely due to gravitational perturbation caused by the presence of the companion.

Abstract Copyright:

Journal keyword(s): stars: planetary systems - stars: abundances - binaries: visual

VizieR on-line data: <Available at CDS (J/A+A/377/123): stars.dat hd008071.dat hd013357.dat hd030101.dat hd033334.dat hd200466.dat hd219542.dat>

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 8071 ** 01 19 57.76544 -15 48 51.5472   8.24 7.58 7.51   G0V 51 0
2 HD 13357A PM* 02 10 52.0805988576 +13 40 59.802335688   8.88 8.20 8.75   dG4 74 0
3 HD 30101 ** 04 44 48.17161 +05 17 21.9646           G5 30 0
4 HD 33334A PM* 05 10 59.1117430320 +32 02 19.714754988   8.77 8.06 8.734   G5 42 0
5 HD 82943 PM* 09 34 50.7353072232 -12 07 46.369202196   7.17 6.53     F9VFe+0.5 435 2
6 * 16 Cyg A ** 19 41 48.9534996168 +50 31 30.219536784 6.79 6.59 5.95 5.50 5.17 G1.5Vb 717 1
7 * 16 Cyg B PM* 19 41 51.9726777456 +50 31 03.089030916 7.07 6.86 6.20 5.76 5.42 G3V 842 1
8 HD 195019 PM* 20 28 18.6366815627 +18 46 10.180434472 7.730     6.5   G1V 242 1
9 HD 200466 ** 21 02 21.90501 +37 39 13.9374           K0V+K0V 40 0
10 HD 219542A PM* 23 16 35.2382628336 -01 35 11.476359420   8.88 8.17 8.89   G2V 56 0
11 HD 219542B PM* 23 16 35.4241322256 -01 35 06.951915456   9.284 8.525     G7V 38 1

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2022.08.10-18:19:57

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