Other
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.273..383g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 273, Issue 2, pp. 383-400.
Other
84
Stars: Agb And Post-Agb, Stars: Distances, Stars: Variables: Other, Infrared: Stars, Galaxy: Centre
Scientific paper
We report 580 sets of JHKL observations of 63 long-period Mira-like variables in the Sgr I clear field located in the Bulge of our Galaxy at 3^∘ from the Centre. These include 8 IRAS sources whose periods are given for the first time. No variable shows a period in excess of 700 d. The sample appears to be close to complete and it is demonstrated that the apparent period distribution from a given survey is highly dependent on the wavelengthused. The colours and other properties of the Sgr I Miras are compared with those in the LMC and the solar neighbourhood. Although the J-K colours of the shorter-period Sgr I Miras are similar to those of their counterparts in the LMC, showing that they have similar temperatures at a given period, differences exist in their J-H and H-K colours. At longer periods, the Sgr I Miras appear redder in all colour indices than the LMC relations and their extrapolations. The apparent K-log P and m_bol-log P relations for Miras in the Sgr I field are derived. The scatter about these relations is higher in Sgr I than for the LMC because of the significant depth of the Bulge in the line of sight. In conjunction with a simple model of the Bulge, the K-log P and M_bol-log P relations for LMC Miras are used to discuss the distance of the Sgr I field, the best value of which is found to be 8.7 +/- 0.7 kpc (taking the distance modulus of the LMC to be 18.55 with s.e. 0.1 - 0.15). The value of R_0, the distance to the Galactic Centre, is 0.2 kpc greater if the Sgr I field is part of a bar lying in the Galactic Plane and inclined at 45^∘ to the line of sight.
Catchpole Robin M.
Feast Michael W.
Glass S000. I.
Whitelock Patricia A.
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