δ Scuti and related stars: Analysis of the R00 Catalogue

Free access article

Issue		A&A Volume 366, Number 1, January IV 2001


Page(s)		178 - 196
Section		Formation, structure and evolution of stars
DOI		http://dx.doi.org/10.1051/0004-6361:20000205

A&A 366, 178-196 (2001)
DOI: 10.1051/0004-6361:20000205

$\delta$ Scuti and related stars: Analysis of the R00 Catalogue

E. Rodríguez¹ and M. Breger²

¹ Instituto de Astrofísica de Andalucía, CSIC, PO Box 3004, 18080 Granada, Spain
² Institut für Astronomie, Universität Wien, Türkenschanzstr. 17, 1180, Austria

(Received 21 September 2000 / Accepted 3 November 2000 )

Abstract
We present a comprehensive analysis of the properties of the pulsating $\delta$ Scuti and related variables based mainly on the content of the recently published catalogue by Rodríguez et al. (2000a, hereafter R00). In particular, the primary observational properties such as visual amplitude, period and visual magnitude and the contributions from the Hipparcos, OGLE and MACHO long-term monitoring projects are examined. The membership of these variables in open clusters and multiple systems is also analyzed, with special attention given to the $\delta$ Scuti pulsators situated in eclipsing binary systems. The location of the $\delta$ Scuti variables in the H-R diagram is discussed on the basis of HIPPARCOS parallaxes and uvby $\beta$ photometry. New borders of the classical instability are presented. In particular, the properties of the $\delta$ Scuti pulsators with nonsolar surface abundances (SX Phe, $\lambda$ Boo, $\rho$ Pup, $\delta$ Del and classical Am stars subgroups) are examined. The Hipparcos parallaxes show that the available photometric uvby $\beta$ absolute magnitude calibrations by Crawford can be applied correctly to $\delta$ Scuti variables rotating faster than $v \sin i \sim$ 100 km s^-1 with normal spectra. It is shown that systematic deviations exist for the photometrically determined absolute magnitudes, which correlate with $v \sin i$ and $\delta m_1$ . The photometric calibrations are found to fit the $\lambda$ Boo stars, but should not be used for the group of evolved metallic-line A stars. The related $\gamma$ Dor variables and the pre-main-sequence $\delta$ Scuti variables are also discussed. Finally, the variables catalogued with periods longer than 0 $\hbox{$.\!\!^{\rm d}$ }$ 25 are examined on a star-by-star basis in order to assign them to the proper $\delta$ Scuti, RR Lyrae or $\gamma$ Dor class. A search for massive, long-period $\delta$ Scuti stars similar to the triple-mode variable AC And is also carried out.

Key words: stars: variables: $\delta$ Scuti -- stars: oscillations -- stars: fundamental parameters

Offprint request: E. Rodríguez

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