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The proper motion of HV2112: A TZO candidate in the SMC

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Worley, CC 
Irwin, MJ 
Tout, CA 
Zytkow, AN 


The candidate Thorne-.Zytkow object (T.ZO), HV2112, is becoming a well-studied if enigmatic object. A key point of its candidacy as a T.ZO is whether or not it resides in the Small Magellanic Cloud (SMC). HV2112 has detections in a series of photometric catalogues which have resulted in contradictory estimates of its proper motion and, therefore, its membership within the SMC. This letter seeks to resolve the issue of the SMC membership of HV2112 through a reanalysis of extant photometric data. We also demonstrate the difficulties and downfalls inherent in considering a range of catalogue proper motions. We conclude that the proper motion, and associated ancillary radial velocity, positional and photometric properties, are fully consistent with HV2112 being within the SMC and thus it remains a candidate T.ZO.



techniques: photometric, proper motions, stars: individual: HV2112, galaxies: individual: SMC

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Monthly Notices of the Royal Astronomical Society: Letters

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Oxford University Press (OUP)
Science and Technology Facilities Council (ST/M007626/1)
Science and Technology Facilities Council (ST/N005805/1)
European Research Council (320360)
Leverhulme Trust (RPG-2012-541)
Science and Technology Facilities Council (ST/L003910/1)
Science and Technology Facilities Council (ST/N000927/1)
This work is based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programme(s) 179.B-2003 and was partly supported by the European Union FP7 programme through ERC grant number 320360. RGI thanks the STFC for funding for his Rutherford fellowship. CAT thanks Churchill College for his fellowship. This research has made use of the VizieR catalogue access tool (A&AS, 143, 23), the Aladin sky atlas and the SIMBAD data base developed and operated at CDS, Strasbourg, France. The Digitized Sky Surveys (DSS) were produced at the Space Telescope Science Institute under US Government grant NAG W-2166.