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New pulsating white dwarfs in cataclysmic variables

Nilsson, Robert ; Uthas, Helena LU ; Ytre-Eide, M. ; Solheim, J-E. and Warner, B. (2006) In Monthly Notices of the Royal Astronomical Society 370(1). p.56-60
Abstract
The number of discovered non-radially pulsating white dwarfs (WDs) in cataclysmic variables (CVs) is increasing rapidly by the aid of the Sloan Digital Sky Survey (SDSS). We performed photometric observations of two additional objects, SDSS J133941.11+484727.5 (SDSS 1339), independently discovered as a pulsator by Gansicke et al., and SDSS J151413.72+454911.9, which we identified as a CV/ZZ Ceti hybrid. In this Letter we present the results of the remote observations of these targets performed with the Nordic Optical Telescope (NOT) during the Nordic-Baltic Research School at Moletai Observatory, and follow-up observations executed by NOT in service mode. We also present three candidates we found to be non-pulsating. The results of our... (More)
The number of discovered non-radially pulsating white dwarfs (WDs) in cataclysmic variables (CVs) is increasing rapidly by the aid of the Sloan Digital Sky Survey (SDSS). We performed photometric observations of two additional objects, SDSS J133941.11+484727.5 (SDSS 1339), independently discovered as a pulsator by Gansicke et al., and SDSS J151413.72+454911.9, which we identified as a CV/ZZ Ceti hybrid. In this Letter we present the results of the remote observations of these targets performed with the Nordic Optical Telescope (NOT) during the Nordic-Baltic Research School at Moletai Observatory, and follow-up observations executed by NOT in service mode. We also present three candidates we found to be non-pulsating. The results of our observations show that the main pulsation frequencies agree with those found in previous CV/ZZ Ceti hybrids, but specifically for SDSS 1339 the principal period differs slightly between individual observations and also from the recent independent observation by Gansicke et al. Analysis of SDSS colour data for the small sample of pulsating and non-pulsating CV/ZZ Ceti hybrids found so far seems to indicate that the r - i colour could be a good marker for the instability strip of this class of pulsating WDs. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
white dwarfs, stars: oscillations, cataclysmic variable, novae, J151413.72+454911.9, stars: individual: SDSS J133941.11+484727.5, stars: individual: SDSS
in
Monthly Notices of the Royal Astronomical Society
volume
370
issue
1
pages
56 - 60
publisher
Oxford University Press
external identifiers
  • wos:000207610500013
  • scopus:34247269329
ISSN
1365-2966
DOI
10.1111/j.1745-3933.2006.00188.x
language
English
LU publication?
yes
id
559efc6a-036d-498f-87e3-8620dbe69c67 (old id 4361371)
date added to LUP
2016-04-01 12:06:25
date last changed
2021-09-29 04:08:21
@article{559efc6a-036d-498f-87e3-8620dbe69c67,
  abstract     = {The number of discovered non-radially pulsating white dwarfs (WDs) in cataclysmic variables (CVs) is increasing rapidly by the aid of the Sloan Digital Sky Survey (SDSS). We performed photometric observations of two additional objects, SDSS J133941.11+484727.5 (SDSS 1339), independently discovered as a pulsator by Gansicke et al., and SDSS J151413.72+454911.9, which we identified as a CV/ZZ Ceti hybrid. In this Letter we present the results of the remote observations of these targets performed with the Nordic Optical Telescope (NOT) during the Nordic-Baltic Research School at Moletai Observatory, and follow-up observations executed by NOT in service mode. We also present three candidates we found to be non-pulsating. The results of our observations show that the main pulsation frequencies agree with those found in previous CV/ZZ Ceti hybrids, but specifically for SDSS 1339 the principal period differs slightly between individual observations and also from the recent independent observation by Gansicke et al. Analysis of SDSS colour data for the small sample of pulsating and non-pulsating CV/ZZ Ceti hybrids found so far seems to indicate that the r - i colour could be a good marker for the instability strip of this class of pulsating WDs.},
  author       = {Nilsson, Robert and Uthas, Helena and Ytre-Eide, M. and Solheim, J-E. and Warner, B.},
  issn         = {1365-2966},
  language     = {eng},
  number       = {1},
  pages        = {56--60},
  publisher    = {Oxford University Press},
  series       = {Monthly Notices of the Royal Astronomical Society},
  title        = {New pulsating white dwarfs in cataclysmic variables},
  url          = {http://dx.doi.org/10.1111/j.1745-3933.2006.00188.x},
  doi          = {10.1111/j.1745-3933.2006.00188.x},
  volume       = {370},
  year         = {2006},
}