The spectrum of SS Cygni during a dwarf nova eruption
1986; IOP Publishing; Volume: 300; Linguagem: Inglês
10.1086/163857
ISSN1538-4357
Autores Tópico(s)Astronomical Observations and Instrumentation
Resumoview Abstract Citations (38) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Spectrum of SS Cygni during a Dwarf Nova Eruption Hessman, F. V. Abstract Analyses of spectroscopic observations made during the declining phase of a short, symmetric eruption of SS Cygni in 1981 are presented. The profiles of the broad H-beta and H-gamma absorption lines from the optically thick disk remained constant throughout much of the decline. This behavior is difficult to reconcile with any of the currently accepted theoretical models for dwarf novae eruptions. The equivalent width of the He II 4686 A emission is roughly constant during the decline. A significant fraction of the increased 4686 A emission comes from a disk 'hot spot', implying that the outburst is accompanied by an increased mass flux from the companion star. This conclusion is supported by the phasing and strength of the Balmer emission cores. Other published data indicate that increased mass transfer may be present in all eruptions of SS Cyg. A strong though not dominant component in the emission cores apears to be chromospheric emission from the K5 V companion star. Publication: The Astrophysical Journal Pub Date: January 1986 DOI: 10.1086/163857 Bibcode: 1986ApJ...300..794H Keywords: Accretion Disks; Balmer Series; Cataclysmic Variables; Dwarf Novae; Stellar Spectra; Absorption Spectra; Emission Spectra; H Lines; Stellar Mass Ejection; Astrophysics; STARS: DWARF NOVAE; STARS: INDIVIDUAL CONSTELLATION NAME: SS CYGNI full text sources ADS | data products SIMBAD (1)
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