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


Query : 2016A&A...585A.152S

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 - 2024
#notes
1 HD 9986 PM* 01 37 40.8790403832 +12 04 42.170345796   7.43 6.76     G2V 119 0
2 HD 13531 BY* 02 13 13.3350408936 +40 30 27.317912976   8.06 7.36     G7V 83 0
3 HD 13931b Pl 02 16 47.3787138792 +43 46 22.786242816           ~ 29 1
4 HD 13931 PM* 02 16 47.3787138792 +43 46 22.786242816       7.2   G0 98 1
5 HD 32963 PM* 05 07 55.7640826464 +26 19 40.674925236   8.22 7.59     G5IV 110 0
6 HD 33636 Pe* 05 11 46.4494089528 +04 24 12.742146936   7.64   6.6   G0V_CH-0.3 192 1
7 HD 43162 LM* 06 13 45.2953762392 -23 51 42.971547996   7.068 6.366 5.94 5.61 G6.5V 178 0
8 HD 45184 PM* 06 24 43.8795895848 -28 46 48.415725948   7.01 6.39 6.24 8.94 G2Va 209 1
9 BD+50 1471 PM* 07 48 06.4723053776 +50 13 32.920598923   12.002 11.138 10.669 10.243 G9V 177 1
10 Ass Vel OB 2 As* 08 09 22.478 -47 21 03.46           ~ 273 0
11 HD 80606 PM* 09 22 37.5768032712 +50 36 13.435326684   9.78 9.00     G8V 335 2
12 HD 87359 PM* 10 04 26.7894493488 -07 13 06.241421568   8.18 7.48     G6V 66 0
13 * 47 UMa PM* 10 59 27.9727514012 +40 25 48.920572724   5.66   4.7   G1-VFe-0.5 776 1
14 * 47 UMa b Pl 10 59 27.9727514012 +40 25 48.920572724           ~ 157 1
15 * 47 UMa d Pl 10 59 27.9727514012 +40 25 48.920572724           ~ 26 1
16 * 47 UMa c Pl 10 59 27.9727514012 +40 25 48.920572724           ~ 99 1
17 HD 98618 PM* 11 21 29.0692801008 +58 29 03.702495840   8.303 7.651     G5V 81 0
18 HD 106252 PM* 12 13 29.5095375792 +10 02 29.887248516   8.00   7.0   G0 192 1
19 HD 106252b Pl 12 13 29.5095375792 +10 02 29.887248516           ~ 47 1
20 HD 106262 Be* 12 13 46.4904395928 -63 43 28.218877464     9.794 10.014   B8/9V 9 0
21 HD 112257 PM* 12 55 08.2639227312 +27 45 58.894557768 8.70 8.46 7.79     G6V 76 0
22 * psi Ser PM* 15 44 01.8185683752 +02 30 54.600593940       5.4   G2.5V 240 0
23 HD 143436 PM* 16 00 18.8372107008 +00 08 13.230170916       7.6   G3V 48 0
24 * 18 Sco PM* 16 15 37.2702755653 -08 22 09.982125430   6.15 5.50     G2Va 609 0
25 * 16 Cyg ** 19 41 49.09 +50 31 31.6           ~ 153 0
26 * 51 Peg PM* 22 57 27.9804852576 +20 46 07.797040104 6.39 6.16 5.46 4.97 4.61 G2IV 1163 1
27 BD+37 4734B PM* 22 57 46.8442481880 +38 40 30.358351704   10.82 9.87     G0V 170 1

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