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Astron. Astrophys. 341, 233-240 (1999)


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The nature of the sharp-lined A1V star HD 72660 *

O. Varenne

UMR 7550, Equipe évolution galactique, Observatoire Astronomique de Strasbourg, 11 rue de l'Université, F-67000 Strasbourg, France

Received 7 September 1998 / Accepted 9 October 1998

Abstract

In order to specify the nature of the sharp-lined A1V star HD 72660, its effective temperature and surface gravity have been determined using two different methods. First, the ultraviolet energy distribution of HD 72660 has been compared with that of the normal A0 star HD 10939 and with the predictions of two model atmospheres. Secondly, the parameters have been derived from Moon & Dworetsky's (1985) calibration of uvby colors. Both methods yield consistent values [FORMULA] = 9750 [FORMULA] K, logg = 4.00 [FORMULA] dex.

In a second part, high resolution high signal to noise optical spectra centered on [FORMULA]4500 Å, [FORMULA]5080 Å and [FORMULA]6160 Å have been synthesized using Gray's (1995) and Takeda's (1995) LTE codes. The abundances of 13 elements were derived. C and O are found to be underabundant with respect to the solar value (-0.60 and -0.52 dex respectively) whereas Ti, Cr, Fe, Ni are overabundant (between +0.37 and +0.72 dex). Ca appears to be moderately overabundant (+0.16 dex). These results suggest that HD 72660 is a hot Am star.

Key words: stars: abundances – stars: chemically peculiar – stars: fundamental parameters – stars: individual: HD 72660

* Based on observations collected at Observatoire de Haute Provence (France)

Send offprint requests to: O. Varenne

© European Southern Observatory (ESO) 1999

Online publication: November 26, 1998

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