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LPVs in NGC 147 and NGC 185

Published online by Cambridge University Press:  11 July 2011

M. Koleva ,
Ph. Prugniel ,
I. Vauglin ,
D. Lorenz ,
T. Lebzelter ,
W. Nowotny ,
J. Telting ,
F. Kerschbaum ,
H. Olofsson  and
H.E. Schwarz
D. Lorenz
Affiliation:
Department of Astronomy, University of Vienna, Austria
T. Lebzelter
Affiliation:
Department of Astronomy, University of Vienna, Austria
W. Nowotny
Affiliation:
Department of Astronomy, University of Vienna, Austria
J. Telting
Affiliation:
Nordic Optical Telescope, La Palma, Spain
F. Kerschbaum
Affiliation:
Department of Astronomy, University of Vienna, Austria
H. Olofsson
Affiliation:
Department of Astronomy, Stockholm University Onsala Space Observatory, Sweden
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Abstract

We examined the light variations of AGB variables of the two Local Group members NGC 147 and NGC 185. A photometric monitoring in the i-band was carried out with the Nordic Optical Telescope at La Palma over ≈ 2.5 yrs resulting in roughly 35 data points for the period analysis. We found 513 long period variables (LPVs) in NGC 185 and 213 LPVs in NGC 147. Additional single-epoch Ks-band photometry was obtained for 387 (NGC 185, 323 with periods) and 182 (NGC 147, 147 with periods) LPVs, respectively. For a large fraction of these stars we also have an indication of the atmospheric chemistry (carbon- or oxygen-rich) from narrow band photometry (see Nowotny et al. 2003). The resulting Ks − logP diagrams for both systems show a well populated sequence of fundamental mode pulsators (sequence C, cf. Ita et al. 2004). In NGC 185 we also see a number of LPVs pulsating in the first overtone mode (sequence C’). Interestingly, such stars are missing in NGC 147. We speculate that this lack of shorter period variables in NGC 147 could originate from a difference in the star formation history (SFH) of the two galaxies, with NGC 147 containing a smaller population of intermediate-age stars.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 48: LPVs in NGC147 and NGC185 , 2011 , pp. 33 - 34
Copyright
© EAS, EDP Sciences, 2011

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References

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