The Close Binary V342 Aquilae: A System Undergoing Extremely Active Mass Transfer

Details The Close Binary V342 Aquilae: A System Undergoing Extremely Active Mass Transfer The Close Binary V342 Aquilae: A System Undergoing Extremely Active Mass Transfer

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.4708h&link_type=abstract

American Astronomical Society, 186th AAS Meeting, #47.08; Bulletin of the American Astronomical Society, Vol. 27, p.878

Astronomy and Astrophysics

Astronomy

2

Scientific paper

Preliminary analysis of the eclipsing binary V342 Aquilae indicates it is undergoing an extremely active phase of mass transfer. This is seen in our comprehensive data set consisting of both IUE spectroscopic and photometric uvbyri data, providing complete orbital phase coverage of the 3.39 day period. IUE observations made in 1991, 1993 and 1995 include 65 low resolution SWP and LWP spectra providing spectral coverage from 1150 to 3200 Angstroms. Besides variable Hα emission seen in the optical, our UV spectra show very pronounced FeII absorption lines arising from ground and metastable levels, indicating an extensive circumstellar shell in the system. The strength of this absorption varies significantly over orbital phase. The eclipse spectra show very strong emission from lines such as CII at 1335 Angstroms, Si IV at 1400 Angstroms, and CIV at 1550 Angstroms. The UV spectra clearly show that the primary is earlier than B8. The effective temperatures, spectral types and orbital geometry of the two stars, as well as the properties of the surrounding circumstellar envelope and the eclipse spectra will be discussed. Our ongoing analysis aims to understand the unusually large rate of mass flow occuring in V342 Aquilae. P.B.E acknowledges support under NSF grant AST-9115104.

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