EDP Sciences
Free access
Volume 417, Number 2, April II 2004
Page(s) 597 - 604
Section Galactic structure, stellar clusters and populations
DOI http://dx.doi.org/10.1051/0004-6361:20040003

A&A 417, 597-604 (2004)
DOI: 10.1051/0004-6361:20040003

Rotation velocities of hot horizontal branch stars in the globular clusters NGC 1904, NGC 2808, NGC 6093, and NGC 7078: The database

A. Recio-Blanco1, G. Piotto1, A. Aparicio2 and A. Renzini3

1  Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 2, 35122 Padova, Italy
    e-mail: recio@pd.astro.it, piotto@pd.astro.it
2  Instituto de Astrofisica de Canarias, via Lactea s/n, 382002 La Laguna Tenerife, Spain
    e-mail: aaj@ll.iac.es
3  ESO, Karl-Schwarzschild-Str. 2, 85748 Garching bei M $\ddot{\rm u}$nchen, Germany
    e-mail: arenzini@eso.org

(Received 9 May 2003 / Accepted 19 December 2003)

We present radial and rotation ( $v\sin i$) velocity measurements from UVES+VLT high resolution spectra of 61 stars in the blue horizontal branches (HB) of the Galactic globular clusters NGC 1904 (M 79), NGC 2808, NGC 6093 (M 80) and NGC 7078 (M 15).

The data reduction and the velocity determination, based on cross-correlation techniques, are discussed in detail. Most of this database has been used by Recio-Blanco et al. (2002) in their analysis of the rotation velocity properties of blue HB stars. Here we present additional data for NGC 2808. We confirm the results of the previous paper, in particular, a possible link between the HB jump and the abrupt change in the rotational velocity distribution around $T_{\rm
eff}\sim 11\,500$  K.

Key words: galaxy: globular clusters: general -- stars: horizontal-branch -- stars: rotation

Offprint request: A. Recio-Blanco, recio@pd.astro.it

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