SIMBAD references

2013ApJ...775...46T - Astrophys. J., 775, 46 (2013/September-3)

Ultraviolet spectroscopic analysis of transient mass flow outburst in U Cephei.

TUPA P.R., DELEO G.G., McCLUSKEY G.E., KONDO Y., SAHADE J., GIMENEZ A. and CATON D.B.

Abstract (from CDS):

Spectra from the International Ultraviolet Explorer taken in 1989 September over one full orbital period of U Cephei (U Cep, HD 5796) are analyzed. The TLUSTY and SYNSPEC stellar atmospheric simulation programs are used to generate synthetic spectra to which U Cep continuum levels are normalized. Absorption lines attributed to the photosphere are divided out to isolate mass flow and accretion spectra. A radial velocity curve is constructed for conspicuous gas stream features, and shows evidence for a transient flow during secondary eclipse with outward velocities ranging between 200 and 350 km/s, and a number density of (3±2)x1010/cm3. The validity of C IV 1548 and 1550 and Si IV 1393 and 1402 lines are re-examined in the context of extreme rotational blending effects. A G-star to B-star mass transfer rate of (5 ±4)x10–9 M_☉/yr is calculated as an approximate upper limit, and a model system is presented.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - binaries: spectroscopic - circumstellar matter - ultraviolet: stars

Status at CDS:  

Simbad objects: 6

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2020.06.03-03:35:16

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