Period—magnitude relations for M giants in Baade's Window NGC 6522

A large and complete sample of stars with K < 9.75 in the NGC 6522 Baade's Window towards the Galactic bulge is examined using light curves extracted from MACHO and IJK photometry from DENIS. The improved statistics resulting from a sample of over 1000 variables allow all four of the sequenc...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2003-10, Vol.345 (1), p.39-48
Main Authors: Glass, I. S., Schultheis, M.
Format: Article
Language:English
Subjects:
infrared: stars
stars: AGB and post-AGB
stars: oscillations
stars: variables: other
surveys
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Summary:A large and complete sample of stars with K < 9.75 in the NGC 6522 Baade's Window towards the Galactic bulge is examined using light curves extracted from MACHO and IJK photometry from DENIS. The improved statistics resulting from a sample of over 1000 variables allow all four of the sequences A, B, C and D in the KS, log P diagram of the Large Magellanic Cloud to be seen in the Galactic bulge. The bulge sequences, however, show some differences from those in the Magellanic Clouds, possibly due to the effects of higher metallicity. These sequences may have value as distance indicators. A new diagram of the frequency of late-type variables at a given amplitude is derived and compared with the old one from Payne-Gaposchkin. The catalogued semiregular variables of the solar neighbourhood are found to be a subset of the total of semiregulars, biased towards large amplitude.
ISSN:0035-8711
1365-2966
DOI:10.1046/j.1365-8711.2003.06914.x