منابع مشابه
Ultra-low Amplitude Cepheids in the Large Magellanic Cloud
The MACHO variables of LMC Field 77 that lie in the vicinity of the Cepheid instability strip are reexamined. Among the 144 variables that we identify as Cepheids we find 14 that have Fourier amplitudes < 0.05 mag in the MACHO red band, of which 7 have an amplitude < 0.006mag : we dub the latter group of stars ultra-low amplitude (ULA) Cepheids. The variability of these objects is verified by a...
متن کاملUltra-low Amplitude Variables in the Lmc – Classical Cepheids, Pop. Ii Cepheids, Rv Tau Stars and Binary Variables
A search for variable stars with ultra-low amplitudes (ULA), in the millimag range, has been made in the combined MACHO and OGLE data bases in the broad vicinity of the Cepheid instability strip in the HR diagram. A total of 25 singly periodic and 4 multiply periodic ULA objects has been uncovered. Our analysis does not allow us to distinguish between pulsational and ellipsoidal (binary) variab...
متن کاملLow amplitude QRS.
Scenario: This 12-lead ECG reading was obtained from a 76-year-old African American woman who presented to the emergency department with shortness of breath, fatigue, and a cough for the past month. Prior medical history includes chronic obstructive pulmonary disease, hypertension, and cigarette smoking for more than 40 years. ECG PUZZLER A regular feature of the American Journal of Critical Ca...
متن کاملStool microflora in extremely low birthweight infants.
AIM To serially characterise aerobic and anaerobic stool microflora in extremely low birthweight infants and to correlate colonisation patterns with clinical risk factors. METHODS Stool specimens from 29 infants of birthweight <1000 g were collected on days 10, 20, and 30 after birth. Quantitative aerobic and anaerobic cultures were performed. RESULTS By day 30, predominant species were Ent...
متن کاملMinerals and extremely low birth weight infants
The 80% of bone mineralisation occurs in the third trimester of pregnancy. The daily fetal requirement is 310 mg of calcium and 170 mg of phosphorus [1]. The bone mineral density (BMD) correlates positively with gestational age, weight and length [2]. At birth, extremely premature infants (ELBWI)canpresent hypocalcaemia because of interruption of the maternal calcium supply, high level of calci...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1993
ISSN: 0252-9211
DOI: 10.1017/s0252921100118007