2006A&A...451..285S


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.27CET04:42:58

2006A&A...451..285S - Astronomy and Astrophysics, volume 451, 285-291 (2006/5-3)

Abundance analysis of 5 early-type stars in the young open cluster IC2391.

STUETZ C., BAGNULO S., JEHIN E., LEDOUX C., CABANAC R., MELO C. and SMOKER J.V.

Abstract (from CDS):

It is unclear whether chemically peculiar stars of the upper main sequence represent a class completely distinct from normal A-type stars, or whether there exists a continuous transition from the normal to the most peculiar late F- to early B-type stars. A systematic abundance analysis of open cluster early-type stars would help to relate the observed differences of the chemical abundances of the photospheres to other stellar characteristics, without being concerned by possible different original chemical composition. Furthermore, if a continuous transition region from the very peculiar to the so called normal A-F stars exists, it should be possible to detect objects with mild peculiarities. As a first step of a larger project, an abundance analysis of 5 F-A type stars in the young cluster IC2391 was performed using high resolution spectra obtained with the UVES instrument of the ESO VLT. Our targets seem to follow a general abundance pattern: close to solar abundance of the light elements and iron peak elements, heavy elements are slightly overabundant with respect to the sun, similar to what was found in previous studies of normal field A-type stars of the galactic plane. We detected a weakly chemically peculiar star, HD74044. Its element pattern contains characteristics of CP1 as well as CP2 stars, enhanced abundances of iron peak elements and also higher abundances of Sc, Y, Ba and Ce. We did not detect a magnetic field in this star (detection limit was 2kG). We also studied the star SHJM2, proposed as a pre-main sequence object in previous works. Using spectroscopy we found a high surface gravity, which suggests that the star is very close to the ZAMS.

Abstract Copyright:

Journal keyword(s): Galaxy: open clusters and associations: individual: IC2391 - stars: abundances - stars: evolution - stars: chemically peculiar - stars: pre-main sequence

Simbad objects: 10

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Number of rows : 10

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 HD 73722 SB* 08 37 26.4349035760 -52 38 42.863968448   9.33 8.92     F5V 32 0
2 HD 73778 PM* 08 37 37.8141100023 -54 11 01.433728090 9.09 9.16 8.77     F0V 19 0
3 CD-52 2473 SB* 08 38 59.8052838278 -53 01 26.187449385 10.00 10.08 9.62     F5V 25 0
4 HD 74044 * 08 39 16.5287774028 -52 18 49.798370558   8.69 8.48     A3mA7-A7 43 0
5 V* KR Vel a2* 08 39 59.3712100344 -53 15 39.446220863   7.183 7.200     ApEuCr(Sr) 73 0
6 IC 2391 OpC 08 40 32 -53 02.0           ~ 707 0
7 HD 74275 * 08 40 48.5254743229 -52 48 06.971088042   7.27 7.27     A0V 58 0
8 V* KT Vel a2* 08 42 18.9920732 -53 06 00.201557 4.79 5.340 5.474     B9III(pSi) 93 0
9 CPD-52 1614 SB* 08 42 46.6081760006 -53 01 01.345805604   10.7 10.3     ~ 26 0
10 V* V469 Vel Al* 08 45 15.5559697339 -53 51 27.621641564   9.80 9.45     A2/3mA7-A8 23 0

    Equat.    Gal    SGal    Ecl

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2020.01.27-04:42:58

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