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Astron. Astrophys. 361, 1143-1151 (2000)

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Proper motions of pre-main sequence stars in southern star-forming regions * **

R. Teixeira 1,2, C. Ducourant 2,1, M.J. Sartori 1, J.I.B. Camargo 1, J.P. Périé 2, J.R.D. Lépine 1 and P. Benevides-Soares 1

1 Departamento de Astronomia, Universidade de São Paulo, Avenida Miguel Stéfano 4200, 04301-904 São Paulo, Brazil
2 Observatoire de Bordeaux, UMR 5804, CNRS/INSU, BP 89, 33270 Floirac, France

Received 30 March 2000 / Accepted 15 June 2000

Abstract

We present proper motion measurements of pre-main sequence (PMS) stars associated with major star-forming regions of the southern hemisphere (Chamaeleon, Lupus, Upper Scorpius - Ophiuchus, Corona Australis), situated in the galactic longitude range [FORMULA] to [FORMULA]. A list of PMS stars as complete as possible was established based on the Herbig and Bell catalogue and many new catalogues like the PDS survey, the catalogue of Herbig Ae/Be stars by Thé et al. (1994), X-rays surveys, etc. The measurements made use of public material (mainly AC2000 and USNO-A2.0 catalogues) as well as scans of SERC-J Schmidt plates with the MAMA measuring machine (Paris) and Valinhos CCD meridian circle observations (Brazil). We derived proper motions for 213 stars, with an accuracy of 5 to 10 mas/yr depending mainly on the difference of epochs between the position sources. The main characteristics of the sample are discussed. We show that systematic motions of groups of stars exist, which are not explained by the reflex solar motion.

Key words: astrometry – stars: kinematics – stars: pre-main sequence – Galaxy: open clusters and associations: general

* Based on observations made at Valinhos CCD Meridian Circle. Based on measurements made with mama automatic measuring machine
** Table 4 is only available in electronic form at the CDS via anonymous ftp to ftp://cdsarc.u-strasbg.fr/pub/cats/J/A+A/361/1143 (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/361/1143

Send offprint requests to: teixeira@orion.iagusp.usp.br

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© European Southern Observatory (ESO) 2000

Online publication: October 10, 2000
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