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Post Info TOPIC: V728 Scorpii
Blobrana


L

Posts: 131433
Date:
Nova Sco 1862
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Title: The hunt for old novae 
Authors: C. Tappert, N. Vogt, L. Schmidtobreick, A. Ederoclite 

We inform on the progress of our on-going project to identify and classify old classical novae, using deep UBVR photometry and subsequent spectroscopy for a proper candidate confirmation, and time-resolved observations in order to find the orbital period and other physical properties of the identified old novae. This way, we have already increased the number of confirmed southern and equatorial post-novae from 33 to 50, and determined new orbital periods of eight objects. As an example, we summarise the results on V728 Sco (Nova Sco 1862) which we found to be an eclipsing system with a 3.32 h orbital period, displaying high and low states similar to dwarf-nova outbursts. Analysis of the low-state eclipse indicates the presence of a small hot inner disc around the white dwarf component. 

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Blobrana


L

Posts: 131433
Date:
V728 Scorpii
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Title: Life after eruption - II. The eclipsing old nova V728 Scorpii
Authors: C. Tappert, N. Vogt, L. Schmidtobreick, A. Ederoclite, J. Vanderbeke

The old nova V728 Sco has been recently recovered via photometric and spectroscopic observations, 150 years after the nova eruption. The spectral properties pointed to a high-inclination system with a comparatively low mass-transfer rate. In this paper we show that the object is an eclipsing system with an orbital period of 3.32 h. It has enhanced long-term variability that can be interpreted as 'stunted' dwarf-nova-type outbursts. Using the ingress and egress times of the eclipsed components we calculate the radius of the central object. The latter turns out to be significantly larger than a white dwarf and we identify it with a hot inner disc. The implications for models on the behaviour of post-novae are discussed.

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