The Interacting Early‐Type Binary BD +40o4220 (V729 Cyg): Modeling the Colliding Winds Region

1999 ◽  
Vol 517 (1) ◽  
pp. 416-430 ◽  
Author(s):  
G. Rauw ◽  
J.‐M. Vreux ◽  
B. Bohannan
Keyword(s):  
Early Type ◽  
V729 Cyg ◽  
Colliding Winds

scholarly journals X-ray selected Wolf-Rayet stars: The discovery of Th35-42 and prospects for future X-ray surveys

1995 ◽  
Vol 163 ◽  
pp. 481-485
Author(s):  
S. Mereghetti ◽  
T. Belloni ◽  
F. Haberl ◽  
W. Voges
Keyword(s):  
Neutron Star ◽  
Emission Line ◽  
Optical Spectroscopy ◽  
Early Type ◽  
X Ray ◽  
Sky Survey ◽  
Colliding Winds ◽  
Einstein Observatory

The X-ray source 1E 1024.0-5732, serendipitously discovered with the Einstein Observatory, was previously interpreted as a rapidly spinning neutron star, accreting matter from its massive early-type companion, the emission-line star Th35-42. However, new ROSAT data do not support the presence of a neutron star in this source. A more likely scenario, also indicated by recent optical spectroscopy, involves X-ray emission from the colliding winds of a WR+O binary. Surprisingly, this star remained unnoticed during an extensive optical search for new Wolf-Rayet stars, carried out in this region of sky. Stimulated by the discovery of this first X-ray selected WR star, we have undertaken a search for similar objects in the data from the ROSAT All Sky Survey.

scholarly journals A Review of Early-Type Close Binary Systems

1984 ◽  
Vol 80 ◽  
pp. 237-237
Author(s):  
K. C. Leung
Keyword(s):  
Mass Exchange ◽  
Binary Systems ◽  
Close Binary ◽  
Early Type ◽  
Close Binary Systems ◽  
Two Systems ◽  
V729 Cyg ◽  
Photometric Solution ◽  
Roche Model ◽  
Absolute Dimensions

AbstractThis is a review of close binary systems with very early spectral types (B, O, Of, and WR stars). We limit our selection to systems with Roche model photometric solution only. There are 10 contact systems known at present. Three of them (V701 Sco, BH Cen, and RZ Pyx) are located in the vicinity of the zero-age contact (ZC) according to a Spectral Type - Period diagram. Only the first two systems have absolute dimensions available. Both of these fall into the ZC zone in the logP - logm diagram and the logm - logR diagram. The system TU Mus was thought to be a ZC system is located in the evolved contact zone (EC) in the above diagrams. Both V701 Sco and BH Cen were thought to be having mass ratios about unity. With the much improved light curves of BH Cen and new analysis the mass ratio has been revised to 0.84! This result may favor Shu's model for early-type zero-age contact systems. The evolved systems might be undergone Case A mass exchange except for two systems (V729 Cyg and RY Set) which might be from Case B. The systems V367 Cyg was classified by Plavec as a W Ser system may be a evolved contact system.It is interesting to note that V729 Cyg (07f + Ofla), UW CMa(07f + O) and CQ Cep(WN7 + O) are all highly evolved contact systems. The Max II of UW CMa and CQ Cep are displaced to 0.78 and 0.80 phase, respectively. The displacement for V729 Cyg is not known due to poor coverage at this phase. The most distinct feature going from Of to Wolf-Rayet stars is the increasing domination of emission lines. It is suspected that this phaseshifts reflect the increasing activity of mass-flow in the common envelope.There are 8 semidetached systems with reliable absolute dimensions. It is believed that 6 of them are derived from Case A while the remaining 2 are from Case B mass exchange.

Colliding winds from early-type stars in binary systems

1992 ◽  
Vol 386 ◽  
pp. 265 ◽  
Author(s):  
Ian R. Stevens ◽  
John M. Blondin ◽  
A. M. T. Pollock
Keyword(s):  
Binary Systems ◽  
Early Type ◽  
Early Type Stars ◽  
Colliding Winds

Analysis of UBV-Photometric Observations of the Massive, Early-Type Binary System V729 Cyg (Cyg OB2 No. 5)

Astrophysics ◽  
2016 ◽  
Vol 59 (1) ◽  
pp. 68-79 ◽  
Author(s):  
E. A. Antokhina ◽  
M. I. Kumsiashvili ◽  
K. B. Chargeishvili
Keyword(s):  
Binary System ◽  
Early Type ◽  
Photometric Observations ◽  
V729 Cyg

scholarly journals Bipolar Jets, Hot Interaction Regions, and Colliding Winds in OB Interacting Binaries

2006 ◽  
Vol 2 (S240) ◽  
pp. 148-153
Author(s):  
Geraldine J. Peters
Keyword(s):  
Hot Spots ◽  
Type Systems ◽  
Direct Impact ◽  
Early Type ◽  
Bipolar Outflows ◽  
Interaction Regions ◽  
Fuv Spectroscopy ◽  
Colliding Winds ◽  
Circumstellar Environment ◽  
Type Mass

AbstractContemporary information on the nature of the circumstellar environment in early-type interacting binaries derived from observation is discussed. Emphasis is placed on results from FUV spectroscopy. New spectra from the FUSE spacecraft and earlier FUV observations with IUE have revealed the presence of hot interaction regions, bipolar outflows, splash outflows, and accretion hot spots in Algol-type systems with B-type mass gainers. In addition, close O-type pairs and systems containing O + W stars show a shock-heated region generated from their colliding winds. Recent FUSE observations of an apparent hot accretion spot and associated splash plasma in the direct-impact system U Cephei are presented.

scholarly journals Current Observational Development in Early-Type Contact Binary Systems

1980 ◽  
Vol 88 ◽  
pp. 527-531
Author(s):  
Kam-Ching Leung
Keyword(s):  
Spectral Type ◽  
Binary Systems ◽  
Close Binary ◽  
Private Communication ◽  
Early Type ◽  
Modern Approach ◽  
Type Contact ◽  
Contact Binary ◽  
V729 Cyg ◽  
Photometric Solution

This is a summary of current observational results of early-type contact binary systems. The classical approaches to derive a photometric solution of a very close binary are found to be incapable of distinguishing whether a system is detached, semidetached, or in contact. A survey of contact systems based on the more modern approach of Wilson and Devinney (1971) and others are summarized in the following. Contact systems with spectral type 0 are: V382 Cyg (Devinney 1976 private communication, Bloomer et al. 1979), V729 Cyg (Leung and Schneider 1978c), UW CMa (Leung and Schneider 1978b), AO Cas (Schneider and Leung 1978); with spectral type B are: SV Cen (Wilson and Starr 1976, Rucinski 1976), V701 Sco (Wilson and Leung 1977, Anderson et al. 1979), BH Cen (Leung and Schneider 1977), RZ Pyx (Devinney 1976 private communication); with spectral type A are: AU Pup (Leung and Schneider 1978a), V1073 Cyg (Leung and Schneider 1978a), V535 Ara (Leung and Schneider 1978a), BV 845 (Leung and Darland 1978), V1010 Oph (Leung and Wilson 1977).

Individual Photoelectric UBV Observations of the Massive Early-Type Binary System V729 Cyg (Cyg OB2 No. 5)

Astrophysics ◽  
2017 ◽  
Vol 60 (2) ◽  
pp. 165-172 ◽  
Author(s):  
M. I. Kumsiashvili ◽  
K. B. Chargeishvili
Keyword(s):  
Binary System ◽  
Early Type ◽  
V729 Cyg

Some results of the Barbier-Chalonge-Divan system of stellar classification

1966 ◽  
Vol 24 ◽  
pp. 77-90 ◽  
Author(s):  
D. Chalonge
Keyword(s):  
Early Type ◽  
Parameter System ◽  
Early Type Stars ◽  
Two Parameter

Several years ago a three-parameter system of stellar classification has been proposed (1, 2), for the early-type stars (O-G): it was an improvement on the two-parameter system described by Barbier and Chalonge (3).

Two cases of bilateral cataracts in early type 1 diabetes

2019 ◽  
Author(s):  
Alice Lelliott ◽  
Supriyo Basu ◽  
Rachel Besser
Keyword(s):  
Type 1 Diabetes ◽  
Early Type

1561-P: Associations between ß-Cell Function and Cognitive Measures Differ in Youth vs. Adults with Impaired Glucose Tolerance (IGT) or Early Type 2 Diabetes (T2D)

Diabetes ◽  
2019 ◽  
Vol 68 (Supplement 1) ◽  
pp. 1561-P
Author(s):  
SUZANNE CRAFT ◽  
AMY CLAXTON ◽  
MARK TRIPPUTI ◽  
SHARON EDELSTEIN ◽  
SILVA A. ARSLANIAN ◽  
...  
Keyword(s):  
Type 2 Diabetes ◽  
Glucose Tolerance ◽  
Impaired Glucose Tolerance ◽  
Cell Function ◽  
Early Type ◽  
Cognitive Measures
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