NSV 11749: Symbiotic Nova, Not a Born-Again Red Giant
- Creators
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Bond, Howard E.
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Kasliwal, M. M.
Abstract
NSV 11749 is a little-studied variable star, discovered by W. J. Luyten, which had a long-duration outburst around the year 1903, reaching blue magnitude 12.5 at maximum. Following the outburst, it has apparently been quiescent at about blue magnitude 17 for the past century. It was recently suggested that NSV 11749 may have been a low- or intermediate-mass star that underwent a final helium shell flash, making it temporarily a "born-again" red giant. If so, it would be only the fourth known member of this class, along with V605 Aql, FG Sge, and V4334 Sgr. However, our newly obtained optical and near-IR spectra of the object show that it is instead a symbiotic binary, with strong Balmer and He I-II emission lines, combined with a cool red-giant companion of spectral type M1-2 III. The 1903 outburst was most likely a symbiotic nova event, of which less than a dozen are known at present.
Additional Information
© 2012. The Astronomical Society of the Pacific. Received 2012 October 16; accepted 2012 October 24; published 2012 November 12. This work was partially supported by the STScI Director's Discretionary Research Fund. We thank Marcelo Miller Bertolami, Ulisse Munari, and David Williams for useful comments, Fred Walter for scheduling the SMARTS 1.5 m observations, and Manuel Hernández and Rodrigo Hernández for making the observations. MMK acknowledges generous support from the Hubble Fellowship and Carnegie-Princeton Fellowship programs. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of UCLA, and JPL/Caltech, funded by NASA.Attached Files
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Additional details
- Eprint ID
- 62929
- Resolver ID
- CaltechAUTHORS:20151215-101039843
- STScI Director's Discretionary Research Fund
- Hubble Fellowship
- Carnegie-Princeton Fellowship
- NASA
- Created
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2015-12-15Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field