DENIS and ISOGAL properties of variable star candidates in the Galactic Bulge

Details DENIS and ISOGAL properties of variable star candidates in the Galactic Bulge DENIS and ISOGAL properties of variable star candidates in the Galactic Bulge

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...362..215s&link_type=abstract

Astronomy and Astrophysics, v.362, p.215-222 (2000)

Astronomy and Astrophysics

Astrophysics

18

Stars: Agb And Post-Agb, Stars: Variables: General, Ism: Dust, Extinction, Galaxy: General, Infrared: Stars

Scientific paper

Repeated DENIS observations (summer 1996 & 1998) in the J (1.25 mu m) and the KS (2.15 mu m) bands are used to look for variable stars. We present two catalogues of ~ 1000 probable variables in an area of ~ 4 deg2 of the inner galactic bulge. The first one contains ~ 720 variable star candidates which show variability in J and KS while the second consists of sources only observed to be variable in KS (~ 270 sources), mainly in regions with high interstellar extinction. Using the extinction map by Schultheis et al. (\cite{Schultheis99a}), most of the variable stars are found to be above the RGB tip and thus belong to the AGB while there is a small fraction of candidates which could be below the RGB tip with rather small ``amplitudes'' of ~ 0.3-0.4 mag in KS. Our catalogue has been cross-correlated with five ISOGAL fields (total area ~ 0.5 deg2) in order to study the mid-IR properties of the LPVs. The AGB variables can be distinguished from other M-type giants by their high 7 mu m luminosities and redder K0-[7] colours. Based on a few repeated ISOCAM observations a good correlation is found between near- and mid-IR variability. This is paper no.~7 in a refereed journal based on data from the ISOGAL project. Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with the participation of ISAS and NASA. Based on observations collected at the European Southern Observatory, La Silla Chile

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