Volume 416, Number 2, March III 2004
|Page(s)||647 - 654|
|Section||Stellar structure and evolution|
|Published online||27 February 2004|
A young and complex binary star – HD 144432
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: email@example.com
3 TNO-TPD, Stieltjesweg 1, PO Box 155, 2600 AD Delft, The Netherlands e-mail: firstname.lastname@example.org
4 The University of Toledo, Dept. of Physics and Astronomy, Toledo, OH 43606, USA e-mail: email@example.com
Corresponding author: M. R. Pérez, firstname.lastname@example.org
Accepted: 17 November 2003
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
© ESO, 2004
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