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Issue A&A Volume 416, Number 2, March III 2004 Page(s) 647 - 654 Section Stellar structure and evolution DOI 10.1051/0004-6361:20034390

A&A 416, 647-654 (2004)
DOI: 10.1051/0004-6361:20034390

A young and complex binary star - HD 144432

M. R. Pérez¹, M. E. van den Ancker², D. de Winter³ and B. W. Bopp<sup>4

1</sup>  Los Alamos National Laboratory, PO Box 1663, ISR-DO, Mail Stop F650, Los Alamos, NM 87545, USA
²  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS 42, Cambridge, MA 02138, USA
    e-mail: mvandena@eso.org
³  TNO-TPD, Stieltjesweg 1, PO Box 155, 2600 AD Delft, The Netherlands
    e-mail: dolf@xiada.ft.uam.es
⁴  The University of Toledo, Dept. of Physics and Astronomy, Toledo, OH 43606, USA
    e-mail: bbopp@uoft02.utoledo.edu

(Received 24 September 2003 / Accepted 17 November 2003 )

Abstract
The southern emission-line star HD 144432 has received considerable attention due to its relative brightness ( ), its late spectral type (late A-type or perhaps early F) and its relative isolation from a bona-fide active star formation region. We present new imaging and spectroscopic data of this star, which in the past has been classified as both an evolved (post-AGB) object and an isolated Herbig Ae/Be star. We confirm the presence of a faint companion source located 1.4´´ north, which appears physically associated with HD 144432. New infrared spectroscopy reveals this companion to be a late-type (early-mid K) star, devoid of any emission lines. Furthermore, we confirm the pre-main sequence nature of this object, report the detection of Li I 6707.8 Å absorption toward the HD 144432 system, and its apparent association with Sco OB2-2 located at 145 pc.

Key words: stars: circumstellar matter -- stars: emission-line, Be -- stars: individual: HD 144432 -- stars: binaries: visual -- stars: pre-main sequence

Offprint request: M. R. Pérez, mperez@lanl.gov

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© ESO 2004

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