Search

sdBV rs is a particular type of hot subdwarfs which have both p-mode and g-mode pulsations. It is unclear of the formation channel of such hot subdwarfs stars. The merger of a He core white dwarf (HeWD) with a main sequence (MS) star can produce a hot subdwarf. We propose that sdBV rs may form from this channel. We compute the models of the remnants of some of these mergers, and perform detailed stability analysis. By comparing to observations, the evolutionary tracks of the remnants of mergers can match with the sdBV rs in effective temperature-surface gravity diagram. These models also have both p-mode and g-mode pulsations been excited. Our result indicates that the merger of a HeWD with a MS star might be one of the formation channels of sdBV rs stars.

Additional file 1. Fig. S1. Tertiary hospital proportion (%) of all types of hospitals in different provinces and cities. Fig. S2. Correlation of 3-hour bundle and 6-hour bundle compliance with linear regression with 95% CI. Spearman rank correlation test, p = 0.7; p < 0.001. Fig. S3. Correlation between sites of infection, age, sex, and proportion of APACHE II score more than 15. Abbreviations: CNS, central nervous system; older, more than 60 years old. Table S1 Association Between Septic shock case volume quartile and hospital mortality of septic shock.

Carbon-enhanced metal-poor (CEMP) stars are considered to be related to the first generation of stars, and responsible for the chemical evolution of the early Galaxy. More than half of them are in binaries, and could be explained by the binary evolution, but the formation channel of them is still not fully understood. Among the hundreds of CEMP stars, there are nine CEMP RR Lyrae stars identified, and at least seven of which are very likely not binaries. The usual binary star evolution channel is difficult to produce such a single star, particularly that of carbon enrichment. One way in which such a single star might be produced is the merger of a helium white dwarf with a Hertzsprung gap (HG) star. We use a stellar evolution program to calculate the models of the merger remnants, and find that the models can reproduce the observed distribution of these CEMP single RR Lyrae stars in terms of surface temperature, gravity, and carbon abundance. Hence, it is extremely possible that the helium white dwarf and HG star merger model is one of the formation channels of the metal-poor carbon-rich RR Lyrae stars.

Additional file 3: eTable 3 the number of ECMO cases and in-hospital mortality in different months.

Additional file 2: eTable 2 the number of ECMO cases and in-hospital mortality in all provinces in mainland China.doc.

Additional file 4: eTable 4 ECMO related complications in 7 geographical regions of China.

Additional file 6: eTable 6 The number and proportion of patients treated with prone position in the provinces with more than 25 cases of VV ECMO.

Additional file 7: eFigure 1 Supplement 2 Flow chart of enrollment. ECMO extracorporeal membrane oxygenation; VV veno-venous; VA veno-arterial.

Additional file 1: eTable 1 regional division of China.doc.

Additional file 8: eFigure 2 the number of ECMO cases and in-hospital mortality in different months ECMO extracorporeal membrane oxygenation; VV veno-venous; VA veno-arterial.