Calculation and analysis of the synchronism parameters for three types of binaries

121

Abstracts

and equilibrium

tide mechanisms

ing the age of each system we analyze

the observed

on circularization mechanisms dynamical

and equilibrium

anisms

especially

components.

Basically,

better

theory.

time of orbital

we find that

necessary

orbits

that the purely hydrodynamic

of pre-main-sequence

and post-AGB

predictions by Zahn’s

theory,

and that

mechanisms

for

we also note that some other mech-

in order to fully explain the circular

circularization,

the predictions

than those by the hydrodynamic However,

By compar-

and the theoretical

tides seem to be two of the main circularizing

in understanding

We suggest

the periods

characteristic of each system

on the main-sequence.

are absolutely

binaries,

eccentricity

by the above theories.

systems

purely hydrodynamic

and its theoretical

orbital

fit, the observations

close binary

and Tassoul’s

circularization

processes

of some systems theory is probably

evolution

in close

with asynchronous

of close binary

important

during

systems.

(AApS

1997, 17, 386-392) and analysis

Calculation ries

Li Lin-sen The critical

binaries found

of Physics,

synchronous

rotation

to be of the same of gaseous

spikes

Yunnan

order

stars.

superimposed

Observatory,

We summarize

17, 409414)

on a large

microwave

the observational

the quasi-periodic

oscillations

Huairou

magnetograms.

Determination

of E and

Wei Jian-yan the Palomar

plates.

and the Digitized

calculations

Visual

to estimate

the magnitude celestial

determination 1997,

*The

discovery

zhong,

Cha Guang-wei,

CAS, Kunming Optical 2313+101,

Xiao-juan

burst of 1988-12-16

and

model with the help of

the

Digitized

Observatory, magnitudes

and plate-density

information

widely.

Survey

Cao Li,

100080

bodies

by utilizing

methods Since

d iscs are available

are the two

the plates

have

now, it will be more

from the DSS directly.

bodies’ E or V magnitudes

are 0.37”(13.5m<

of celestial scanning

and applied

(DSS)

Sky

CAS, Beijing

We have developed

from the DSS. The rms for E and

E 5 18.0m) and 0.42m(14.4m<

V 5 18.gm)

17, 428-434)

of six X-selected Bai Jin-ming,

quasars Li Kai-hua

and

one

Seyfert

& W. Brinkmann

galaxy Yunnan

Xie GuangObservatory,

650011

cross identification

using the 2.16-m

from

Sky Survey

for deriving (AApS

Chen

of the field of the magnetic

based on the bipolar

been discussed

a program

V magnitude

are

of rotational

1997, 17, 421427)

convenient

respectively.

burst

of the large type-IVP

have been made at getting

Sky Survey

in 69 close

The results

on the theory

type-IVP

from MHD modulation

Beijing Astronomical

ways which have already

been digitized,

features

V magnitudes

& Hu Jing-yao

Many attempts main

(AApS

based

of bina-

130024

650011

resulting

flux tube and make quantitative

Changchun

of synchronization.

as those

1997,

CAS, Kunming

for three types

University,

and periods for 93 components

using the theory

of magnitude

(AApS

parameters

Dongbei Normal parameters

of three types are calculated

instability The

of the synchronism

Department

telescope

2318+304,

for seven ROSAT-VLA

of the BAO and OMR

0027+451,

0030+380,

selected

X-ray

CCD spectrophotometry.

0233+022c,

0336+233a

sources

was made

Six of the these,

were found to be new