Journal
ASTRONOMY & ASTROPHYSICS
Volume 416, Issue 2, Pages 647-654Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20034390
Keywords
stars : circumstellar matter; stars : emission-line, Be; stars : individual : HD 144432; stars : binaries : visual; stars : pre-main sequence
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The southern emission-line star HD 144432 has received considerable attention due to its relative brightness (Vsimilar to8.17), 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 Angstrom absorption toward the HD 144432 system, and its apparent association with Sco OB2-2 located at 145 pc.
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