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V5852 Sgr: an unusual nova possibly associated with the Sagittarius stream.

Authors :
Aydi, E.
Mróz, P.
Whitelock, P. A.
Mohamed, S.
Wyrzykowski, Ł.
Udalski, A.
Vaisanen, P.
Nagayama, T.
Dominik, M.
Scholz, A.
Onozato, H.
Williams, R. E.
Hodgkin, S. T.
Nishiyama, S.
Yamagishi, M.
Smith, A. M. S.
Ryu, T.
Iwamatsu, A.
Kawamata, I.
Source :
Monthly Notices of the Royal Astronomical Society; 9/11/2016, Vol. 461 Issue 2, p1529-1538, 10p
Publication Year :
2016

Abstract

We report spectroscopic and photometric follow-up of the peculiar nova V5852 Sgr (discovered as OGLE-2015-NOVA-01), which exhibits a combination of features from different classes nova. The photometry shows a flat-topped light curve with quasi-periodic oscillations, then a smooth decline followed by two fainter recoveries in brightness. Spectroscopy with the Southern African Large Telescope shows first a classical nova with an Fe <subscript>II</subscript> or Fe <subscript>II</subscript> b spectral type. In the latter spectrum, broad emissions from helium, nitrogen and oxygen are prominent, and the iron has faded which could be an indication to the start of the nebular phase. The line widths suggest ejection velocities around 1000 km s<superscript>-1</superscript>. The nova is in the direction of the Galactic bulge and is heavily reddened by an uncertain amount. The V magnitude 16 days after maximum enables a distance to be estimated and this suggests that the nova may be in the extreme trailing stream of the Sagittarius dwarf spheroidal galaxy. If so it is the first nova to be detected from that, or from any dwarf spheroidal galaxy. Given the uncertainty of the method and the unusual light curve we cannot rule out the possibility that it is in the bulge or even the Galactic disk behind the bulge. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00358711
Volume :
461
Issue :
2
Database :
Complementary Index
Journal :
Monthly Notices of the Royal Astronomical Society
Publication Type :
Academic Journal
Accession number :
117173192
Full Text :
https://doi.org/10.1093/mnras/stw1396