The Remarkable Rotational Braking of G5 Giants

Do Si stars undergo any rotational braking ? ?

The old question of rotational braking of Ap Si stars is revisited on the empirical side, taking advantage of the recent Hipparcos results. Field stars with various evolutionary states are considered, and it is shown that the loose correlation between their rotational period and their surface gravity is entirely compatible with conservation of angular momentum. No evidence is found for any loss...

Rotational velocities of the giants in symbiotic stars : II . Are they synchronized ? ⋆

We have measured the rotational velocities (v sin i) of the mass donors for 36 symbiotic stars using the cross-correlation function (CCF) method. We got a meaningful CCF for 29 objects and we derived only upper limits for 7 objects (v sin i< 3.5 km s, 6 out of these 7 are symbiotic Miras). In a sub-sample of 16 S–type symbiotic stars (with known orbital periods and well measured v sin i) 15 hav...

Historical Perspectives Standing on the shoulders of giants: Dean Franklin and his remarkable contributions to physiological measurements in animals

Sarazan RD, Schweitz KT. Standing on the shoulders of giants: Dean Franklin and his remarkable contributions to physiological measurements in animals. Adv Physiol Educ 33: 144–156, 2009; doi:10.1152/advan.90208.2008.—The use of electronic instrumentation to monitor physiological function in conscious research animals and humans has become routine. Beyond basic research, animal studies using the...

the shoulders of Giants

Standing on the shoulders of giants: Dean Franklin and his remarkable contributions to physiological measurements in animals.

The use of electronic instrumentation to monitor physiological function in conscious research animals and humans has become routine. Beyond basic research, animal studies using these methods are required by government regulatory agencies worldwide before human testing of potential new drugs. Living, as we do, in an age of miniaturized high-tech electronic devices, we are accustomed to believing...