EDP Sciences
Free access
Issue
A&A
Volume 390, Number 1, July IV 2002
Page(s) 109 - 119
Section Stellar clusters and associations
DOI http://dx.doi.org/10.1051/0004-6361:20020713


A&A 390, 109-119 (2002)
DOI: 10.1051/0004-6361:20020713

Rotation of stars in NGC 6134

A comparison of $\delta$ Scuti stars and non-variable stars
M. B. Rasmussen1, H.Bruntt1, S. Frandsen1, E. Paunzen2 and H. M. Maitzen2

1  Institute for Physics and Astronomy, University of Aarhus, Bygn. 520, 8000 Aarhus C, Denmark
2  Institut für Astronomie der Universität Wien, Türkenschanzstrasse 17, 1180 Wien, Austria

(Received 14 February 2002 / Accepted 24 April 2002)

Abstract
We present results of spectroscopic observations of selected stars in the southern open cluster NGC 6134. We have determined the rotational velocities of the six known $\delta$ Scuti stars in NGC 6134 as well as several other non-variable stars with similar colour temperature in order to investigate if $v\sin i$ and variability is somehow connected: we find no such correlation. We also compare the distribution of $v\sin i$ of $\delta$ Scuti stars and non-variable stars with four other well-studied open clusters to look for any systematic behaviour, but we find no conclusive evidence for $v\sin i$ and variability to be connected. We have also used the spectra to carry out an abundance analysis of the $\delta$ Scuti stars in NGC 6134 to confirm the high metal content of the cluster. We find $[{\rm Fe/H}] = +0.38\pm0.05$ which is in agreement with the result obtained from Strömgren photometry. We also present $\Delta a$ photometry of the cluster, but we find no chemical peculiar stars based on this index.


Key words: stars: oscillations -- stars: variable: $\delta$ Scuti -- stars: rotation -- open clusters and associations: individual: NGC 6134, NGC 3680

Offprint request: S. Frandsen, srf@ifa.au.dk

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