1998A&A...338.1073B


Query : 1998A&A...338.1073B

1998A&A...338.1073B - Astronomy and Astrophysics, volume 338, 1073-1079 (1998/10-3)

The Praesepe open cluster: abundances of Li, Al, Si, S, Fe, Ni, and Eu in A stars.

BURKHART C. and COUPRY M.F.

Abstract (from CDS):

In the second of a series of papers on the A stars in open clusters, the Praesepe cluster is investigated; in the first paper, it was the Pleiades. Ten A Praesepe stars were observed with the Canada-France-Hawaii telescope at high spectral resolution and high signal-to-noise ratios. Photospheric abundances of the sample, which has turned out to be composed exclusively with Am stars, have been determined for Li, Al, Si, S, Fe, Ni, and Eu from model atmosphere abundance analysis. The A stars of Praesepe are well advanced in the Main Sequence evolution: several of the observed stars are in the turn-off (and one is a blue straggler). The Li abundance in Am stars is the same as in non-evolved Praesepe F stars on the hot side of the Li dip, and Fe is twice its original value as given by Praesepe F stars. The abundances of the studied elements were found remarkably uniform in the cluster over a large range of Teff, i.e., for various structure envelopes and evolution. Surface abundances of Li and Fe remain unchanged in Am stars at both ages of the Pleiades and Praesepe clusters. The Li results for the Am stars challenge predictions from evolutionary model envelopes in the framework of a diffusion-dominant description.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: chemically peculiar - open clusters and associatiobns: individual: Praesepe

Simbad objects: 13

goto View the references in ADS

Number of rows : 13
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 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3183 0
2 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1819 0
3 HD 72942 SB* 08 36 17.4427895592 +20 20 29.417866260   7.60 7.48     A3V 70 0
4 HD 73045 SB* 08 36 48.0046481184 +18 52 58.090934424   8.89 8.62     Am 77 0
5 HD 73174 SB* 08 37 36.9991109064 +19 43 58.510939908   7.95 7.76     Am 86 0
6 HD 73618 ** 08 39 56.4981407544 +19 33 10.788354324   7.49 7.30     Am 87 0
7 * 40 Cnc BS* 08 40 11.4526327416 +19 58 16.083202980   6.62 6.61     A1V 146 0
8 NGC 2632 OpC 08 40 13 +19 37.3           ~ 1384 0
9 HD 73711 * 08 40 18.0969905712 +19 31 55.163632944   7.67 7.51     F0III 106 0
10 HD 73709 SB* 08 40 20.7479143752 +19 41 12.242993316   7.87 7.68     kA2hA5mF0(III-IV)(Cr) 101 0
11 HD 73730 V* 08 40 23.4641462184 +19 50 05.895548772   8.20 7.99     F2III 78 0
12 * eps Cnc SB* 08 40 27.0100951392 +19 32 41.324313444 6.630 6.460 6.290     A5m 124 0
13 HD 73818 * 08 40 56.9348997672 +19 56 05.476641288   8.99 9.096     Am 85 0

To bookmark this query, right click on this link: simbad:objects in 1998A&A...338.1073B and select 'bookmark this link' or equivalent in the popup menu


2022.05.22-09:24:54

© Université de Strasbourg/CNRS

    • Contact