Proper motions of pre-main sequence stars { } in southern star-forming regions
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 l = 290degr to l = 360degr . 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. (\cite{the}), 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. 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 cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- September 2000
- DOI:
- 10.48550/arXiv.astro-ph/0007124
- arXiv:
- arXiv:astro-ph/0007124
- Bibcode:
- 2000A&A...361.1143T
- Keywords:
-
- ASTROMETRY;
- STARS: KINEMATICS;
- STARS: PRE-MAIN SEQUENCE;
- GALAXY: OPEN CLUSTERS AND ASSOCIATIONS: GENERAL;
- Astrophysics
- E-Print:
- 14 pages, LaTeX, 12 PostScript figures, 6 tables