An astrometric study of possible members of Cen OB1, the possible generator of HI shell GS305+04-26

ORELLANA, ROSA B.; CORTI, MARIELA A.

La Plata

Workshop; V Astronomía Dinámica en Latinoamérica (V ADeLA); 2012

The OB associations are an ideal laboratory, and sometimes only for the study of various chemical and physical processes that characterize the interaction between the stellar component and the various gaseous phases of the interstellar medium. Neutral hydrogen (HI) shell GS305+04-26 centered at (l, b) = (305$^{circ}$, +4$^{circ}$), may have been generated by strong winds from the members of the "Centaurus OB1 association´´ (Cen~OB1), with which they share the location in the galaxy (Corti et al., 2012). In reaching this conclusion it was necessary an astrometric study, as we currently only available spectrophotometric work of Humphreys (1978) and photometric work of Humphreys & McElroy (1984). In order to improve knowledge about possible Cen~OB1 members, took out a search for them from the analysis of the proper motions using the astrometric model proposed by Orellana et al. (2011). Getting the spectral type of each star of the searches made in the VizieR Catalogue Service and photometric data obtained from the Tycho 2 catalog, could be calculated the distance of the astrometric members of Cen~OB1 and eliminate those stars that were not at the distance of the shell