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Third-nearest WZ Sge-Type dwarf nova candidate ASASSN-14dx classified on the basis of Gaia Data Release 2.
- Source :
- Publications of the Astronomical Society of Japan; Jan2019, Vol. 71 Issue 1, pN.PAG-N.PAG, 1p
- Publication Year :
- 2019
-
Abstract
- ASASSN-14dx showed an extraordinary outburst whose features are a small outburst amplitude (∼2.3 mag) and long duration (>4 yr). Because we found a long observational gap of 123 d before the outburst detection, we propose that the main outburst plateau was missed and that this outburst is just a "fading tail" often seen after the WZ Sge-type super-outbursts. In order to distinguish between WZ Sge and SU UMa-type dwarf novae (DNe), we investigated Gaia Data Release 2 (DR2) statistically. We applied a logistic regression model and succeeded in classifying by using absolute Gaia magnitudes M<subscript>G</subscript> and Gaia colors G <subscript>BP</subscript>– G <subscript>RP</subscript>. Our new classifier also suggests that ASASSN-14dx is the best candidate of a WZ Sge-type DN. We estimated distances from the Earth of known WZ Sge stars by using Gaia DR2 parallaxes. The result indicates that ASASSN-14dx is the third-nearest WZ Sge star (next to WZ Sge and V455 And), and hence the object can show the third-brightest WZ Sge-type super-outburst whose maximum is V = 8–9 mag. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00046264
- Volume :
- 71
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Publications of the Astronomical Society of Japan
- Publication Type :
- Academic Journal
- Accession number :
- 134533234
- Full Text :
- https://doi.org/10.1093/pasj/psy141