EDP Sciences
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Volume 388, Number 3, June IV 2002
Page(s) 861 - 867
Section Galactic structure and dynamics
DOI http://dx.doi.org/10.1051/0004-6361:20020562

A&A 388, 861-867 (2002)
DOI: 10.1051/0004-6361:20020562

V39: An unusual object in the field of IC 1613

L. Mantegazza1, E. Antonello1, D. Fugazza1, S. Covino1 and G. L. Israel2

1  Osservatorio Astronomico di Brera, Via E. Bianchi 46, 23807 Merate, Italy
2  Osservatorio Astronomico di Roma, Via di Frascati 33, 00040 Monteporzio Catone, Italy

(Received 6 March 2002 / Accepted 8 April 2002 )

The variable star V39 in the field of IC 1613 is discussed in the light of the available photometric and new spectroscopic data. It has strong emission Balmer lines, and the observed characteristics could be explained by a W Vir pulsating star with a period of 14.341 d, located at more than 115 kpc, that is in the very outer halo of our Galaxy. It should have an apparent companion, a long period (1118 d) red variable, belonging to IC 1613. The main uncertainty in this interpretation is an emission feature at 6684 Å, which we tentatively identified as a He I line.

Key words: stars: emission-line, Be -- stars: variables: general -- Galaxy: halo -- Galaxy: structure

Offprint request: L. Mantegazza, luciano@merate.mi.astro.it

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© ESO 2002