2016A&A...585A.152S


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.23CET00:45:42

2016A&A...585A.152S - Astronomy and Astrophysics, volume 585A, 152-152 (2016/1-1)

Planet signatures and effect of the chemical evolution of the Galactic thin-disk stars.

SPINA L., MELENDEZ J. and RAMIREZ I.

Abstract (from CDS):

Studies based on high-precision abundance determinations revealed that chemical patterns of solar twins are characterised by the correlation between the differential abundances relative to the Sun and the condensation temperatures (Tc) of the elements. It has been suggested that the origin of this relation is related to the chemical evolution of the Galactic disk, but other processes, associated with the presence of planets around stars, might also be involved. We analyse HIRES spectra of 14 solar twins and the Sun to provide new insights on the mechanisms that can determine the relation between [X/H] and Tc. Our spectroscopic analysis produced stellar parameters (Teff, log g, [Fe/H], and ξ), ages, masses, and abundances of 22 elements (C, O, Na, Mg, Al, Si, S, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Y, and Ba). We used these determinations to place new constraints on the chemical evolution of the Galactic disk and to verify whether this process alone can explain the different [X/H]-Tc slopes observed so far. We confirm that the [X/Fe] ratios of all the species correlate with age. The slopes of these relations allow us to describe the effect that the chemical evolution of the Galactic disk has on the chemical patterns of the solar twins. After subtracting the chemical evolution effect, we find that the unevolved [X/H]-Tc slope values do not depend on the stellar ages anymore. However, the wide diversity among these [X/H]-Tc slopes, covering a range of ±4x10–5dex/K, indicates that processes in addition to the chemical evolution may affect the [X/H]-Tc slopes. The wide range of unevolved [X/H]-Tc slope values spanned at all ages by our sample could reflect the wide diversity among exo-planetary systems observed so far and the variety of fates that the matter in circumstellar disks can experience.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: fundamental parameters - stars: solar-type - planetary systems - Galaxy: disk - Galaxy: evolution

Simbad objects: 27

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Number of rows : 27

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 9986 PM* 01 37 40.8792727548 +12 04 42.171416648   7.43 6.76     G2V 90 0
2 HD 13531 BY* 02 13 13.3349094139 +40 30 27.317791786   8.06 7.36     G7V 72 0
3 HD 13931b Pl 02 16 47.3784111993 +43 46 22.789604279           ~ 18 1
4 HD 13931 PM* 02 16 47.3784111993 +43 46 22.789604279       7.2   G0 72 1
5 HD 32963 PM* 05 07 55.7640205347 +26 19 40.673246305   8.22 7.59     G5IV 88 0
6 HD 33636 Pe* 05 11 46.4489745849 +04 24 12.759759957   7.64   6.6   G0V_CH-0.3 169 1
7 HD 43162 LM* 06 13 45.2955618090 -23 51 42.968779940   7.068 6.366 5.94 5.61 G6.5V 150 0
8 HD 45184 PM* 06 24 43.8797456693 -28 46 48.416253741   7.01 6.39 6.24 8.94 G2Va 168 1
9 BD+50 1471 PM* 07 48 06.4726006390 +50 13 32.921121328   12.002 11.138 10.669 10.243 G9V 142 1
10 Ass Vel OB 2 As* 08 09 22.478 -47 21 03.46           ~ 223 0
11 HD 80606 PM* 09 22 37.5769478105 +50 36 13.434928660   9.78 9.00     G5 290 2
12 HD 87359 PM* 10 04 26.7890850781 -07 13 06.227654967   8.18 7.48     G6V 50 0
13 * 47 UMa c Pl 10 59 27.9738644892 +40 25 48.922388918           ~ 88 1
14 * 47 UMa d Pl 10 59 27.9738644892 +40 25 48.922388918           ~ 18 1
15 * 47 UMa b Pl 10 59 27.9738644892 +40 25 48.922388918           ~ 146 1
16 * 47 UMa PM* 10 59 27.9738644892 +40 25 48.922388918   5.66   4.7   G1-VFe-0.5 722 1
17 HD 98618 PM* 11 21 29.0694769107 +58 29 03.704275968   8.303 7.651     G5V 66 0
18 HD 106252b Pl 12 13 29.5100104731 +10 02 29.888816943           ~ 37 1
19 HD 106252 PM* 12 13 29.5100104731 +10 02 29.888816943   8.00   7.0   G0 162 1
20 HD 106262 Be* 12 13 46.4623 -63 43 28.239   10.10 9.92     B8/9V 6 0
21 HD 112257 PM* 12 55 08.2641341225 +27 45 58.894837879 8.70 8.46 7.79     G6V 61 0
22 * psi Ser PM* 15 44 01.8189306784 +02 30 54.600773948       5.4   G2.5V 187 0
23 HD 143436 PM* 16 00 18.8372576001 +00 08 13.230554014       7.6   G3V 34 0
24 * 18 Sco PM* 16 15 37.2703721200 -08 22 09.981989277   6.15 5.50     G2Va 498 0
25 * 16 Cyg ** 19 41 49.09 +50 31 31.6           ~ 121 0
26 * 51 Peg Ro* 22 57 27.9804167474 +20 46 07.782240714 6.39 6.16 5.46 4.97 4.61 G2IV 1085 1
27 BD+37 4734B PM* 22 57 46.8443014981 +38 40 30.355384717   10.82 9.87     G0V 145 1

    Equat.    Gal    SGal    Ecl

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2021.01.23-00:45:42

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