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Titolo: Phase changes of the Be/X-ray binary X Persei
Autore: Clark, JS; Tarasov, AE; Okazaki, AT; Roche, P; Lyuty, VM;
- Indirizzi:
- Univ Coll London, Dept Phys & Astron, London WC1E 6BT, England Univ Coll London London England WC1E 6BT stron, London WC1E 6BT, England Univ Sussex, CPES, Ctr Astron, Brighton BN1 9QH, E Sussex, England Univ Sussex Brighton E Sussex England BN1 9QH BN1 9QH, E Sussex, England Crimean Astrophys Observ, UA-98409 Naucny, Crimea, Ukraine Crimean Astrophys Observ Naucny Crimea Ukraine UA-98409 , Crimea, Ukraine Isaac Newton Inst Chile, Crimean Branch, UA-98409 Naucny, Crimea, Ukraine Isaac Newton Inst Chile Naucny Crimea Ukraine UA-98409 y, Crimea, Ukraine Hokkai Gakuen Univ, Fac Engn, Toyohira Ku, Sapporo, Hokkaido 0628605, Japan Hokkai Gakuen Univ Sapporo Hokkaido Japan 0628605 Hokkaido 0628605, Japan Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England Univ Cambridge Cambridge England CB3 0HA ron, Cambridge CB3 0HA, England Univ Leicester, Dept Phys & Astron, Leicester LE1 9RH, Leics, England UnivLeicester Leicester Leics England LE1 9RH er LE1 9RH, Leics, England Sternberg Astron Inst, Moscow 119899, Russia Sternberg Astron Inst Moscow Russia 119899 n Inst, Moscow 119899, Russia
- Titolo Testata:
- ASTRONOMY & ASTROPHYSICS
fascicolo: 2,
volume: 380,
anno: 2001,
pagine: 615 - 629
- SICI:
- 1432-0746(200112)380:2<615:PCOTBB>2.0.ZU;2-V
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- ONE-ARMED OSCILLATIONS; STAR ENVELOPES; MU-CENTAURI; DISKS; VARIABILITY; POLARIMETRY; OUTBURSTS; LINES;
- Keywords:
- circumstellar matter; stars : early type; stars : individual : X Persei; 4U 0352+30;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 51
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Clark, JS Univ Coll London, Dept Phys & Astron, Gower St, London WC1E 6BT,England Univ Coll London Gower St London England WC1E 6BT 6BT, England
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- Citazione:
- J.S. Clark et al., "Phase changes of the Be/X-ray binary X Persei", ASTRON ASTR, 380(2), 2001, pp. 615-629
Abstract
We present high resolution optical spectroscopy and V band photometry obtained during the period 1987-2001 for the Be star X Persei/HD 24534, the counterpart to the X-ray pulsar 4U 0352+30. We find that throughout this interval X Per is highly active, with significant photometric and spectroscopic variability. We identify one episode of complete disc loss during this period (1988 May-1989 June), characterised by significant DeltaV = 0.6 mag optical fading and the presence of purely photospheric H alpha and He I 6678 Angstrom lines. Two further episodes of pronounced optical fading which did not result in the complete dispersal of the circumstellar disc were also identified (1994 October-1995 October and 1999 November-present). The emissionline profiles of both H alpha and He I 6678 Angstrom also show significantvariability. Cyclic changes in the strength of the peaks in both emission lines are observed, with periods ranging from 0.6-2 yrs-we attribute these to the presence of a one armed density wave in the inner circumstellar disc. Additional structure at large projected velocities is also present in theHe I line-suggesting the presence of a significant density enhancement in the disc near the stellar surface (the "double disc" of Tarasov & Roche). The evolution of the outer edge of the H alpha emitting region of the circumstellar disc is followed during disc formation, and is found to increase rather slowly. This observation, combined with the presence of the one armed density wave and the rate of disc formation and loss all provide strong evidence for the hypothesis that the circumstellar disc of X Per is a viscous decretion disc, with angular momentum being supplied by an as yet unknown physical mechanism near the stellar surface.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/05/13 alle ore 16:31:23