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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/27892
Title: Variable Stars and Stellar Populations in Andromeda XXVII. IV. An Off-centered, Disrupted Galaxy
Authors: CUSANO, FELICE 
GAROFALO, Alessia 
CLEMENTINI, Gisella 
Cignoni, Michele
Muraveva, Tatiana 
Tessicini, Gianni
TESTA, Vincenzo 
PARIS, Diego 
FEDERICI, Luciana
MARCONI, Marcella 
RIPEPI, Vincenzo 
MUSELLA, ILARIA 
Issue Date: 2017
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 851
Issue: 1
First Page: 9
Abstract: We present B and V time-series photometry of the M31 satellite galaxy Andromeda XXVII (And XXVII) that we observed with the Large Binocular Cameras of the Large Binocular Telescope. In the field of And XXVII we have discovered a total of 90 variables: 89 RR Lyrae stars and 1 Anomalous Cepheid. The average period of the fundamental mode RR Lyrae stars (RRab) < {P}<SUB>{ab</SUB>}> =0.59 {days} (σ = 0.05 day) and the period-amplitude diagram place And XXVII in the class of Oosterhoff I/Intermediate objects. Combining information from the color-magnitude diagram (CMD) and the variable stars, we find evidence for a single old and metal-poor stellar population with [Fe/H] ∼ -1.8 dex and t ∼ 13 Gyr in And XXVII. The spatial distributions of RR Lyrae and red giant branch (RGB) stars give clear indication that And XXVII is a completely disrupted system. This is also supported by the spread observed along the line of sight in the distance to the RR Lyrae stars. The highest concentration of RGB and RR Lyrae stars is found in a circular area of 4 arcmin in radius, centered about 0.°2 in the southeast direction from Richardson et al.’s center coordinates of And XXVII. The CMD of this region is well-defined, with a prominent RGB and 15 RR Lyrae stars (out of the 18 found in the region) tracing a very tight horizontal branch at < V({RR})> =25.24 {mag} σ = 0.06 mag (average over 15 stars). We show that And XXVII is a strong candidate building block of the M31 halo. <P />Based on data collected with the Large Binocular Cameras at the Large Binocular Telescope, PI: G. Clementini.
URI: http://hdl.handle.net/20.500.12386/27892
URL: https://iopscience.iop.org/article/10.3847/1538-4357/aa96a5
ISSN: 0004-637X
DOI: 10.3847/1538-4357/aa96a5
Bibcode ADS: 2017ApJ...851....9C
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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