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Astron. Astrophys. 347, 550-555 (1999)

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The peculiar single giant HD 112989: rotation, activity and evolution *

J.R. De Medeiros 1, R.K. Konstantinova-Antova 2 and J.R.P. Da Silva 1

1 Departamento de Física, Universidade Federal do Rio Grande do Norte, 59072-970 Natal, R.N., Brazil,
2 Institute of Astronomy, Bulgarian Academy of Sciences, 72 Tsarigradsko shose, BG-1784 Sofia, Bulgaria

Received 20 November 1997 / Accepted 12 May 1999

Abstract

A spectroscopic, photometric and evolutionary study is presented for HD 112989, an active peculiar giant star. The present spectroscopic observations show a significant CaII K&H emission core variability, whereas the UBV photometry shows that HD 112989 has a variable brightness. The rotational velocity for this star, 11.0 kms-1, is about five times larger than the mean rotational velocity for giants with the same spectral type. In addition, we have found no sign of binarity for this star.

Key words: stars: activity – stars: chromospheres – stars: fundamental parameters – stars: individual: HD 112989 – stars: rotation

* Based on observations collected at the Observatoire de Haute-Provence (France) and at the Bulgarian National Astronomical Observatory-Rozhen (Bulgaria)

Send offprint requests to: J.R. De Medeiros

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© European Southern Observatory (ESO) 1999

Online publication: June 30, 1999
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