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Issue A&A
Volume 374, Number 3, August II 2001
Page(s) 1085 - 1091
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20010816



A&A 374, 1085-1091 (2001)
DOI: 10.1051/0004-6361:20010816

On the Wilson-Bappu relationship in the MgII k line

A. Cassatella1, 2, A. Altamore2, M. Badiali1 and D. Cardini1

1  Istituto di Astrofisica Spaziale, CNR, Area di Ricerca Tor Vergata, Via del Fosso del Cavaliere 100, 00133 Roma, Italy
2  Dipartimento di Fisica E. Amaldi, Università degli Studi Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy

(Received 28 March 2001 / Accepted 5 June 2001 )

Abstract
An investigation is carried out on the Wilson-Bappu effect in the MgII k line at 2796.34 Å. The work is based on a selection of 230 stars observed by both the IUE and HIPPARCOS satellites, covering a wide range of spectral types (F to M) and absolute visual magnitudes (- $5.4\le M_{V} \le9.0$). A semi-automatic procedure is used to measure the line widths, which applies also in the presence of strong central absorption reversal. The Wilson-Bappu relationship here provided is considered to represent an improvement over previous recent results for the considerably larger data sample used, as well as for a proper consideration of the measurement errors. No evidence has been found for a possible dependence of the WB effect on stellar metallicity and effective temperature.


Key words: stars: distances -- stars: late-type -- ultraviolet: general -- line: profiles -- catalogs

Offprint request: D. Cardini, cardini@ias.rm.cnr.it

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