Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7394p&link_type=abstract
HST Proposal ID #7394
Physics
Hst Proposal Id #7394 Cool Stars
Scientific paper
Uncertainty in the amount of mass lost by a low-mass, old, metal-poor star as it evolves up the giant branch for the first time is one of the most significant impediments to the interpretation of globular-cluster color-magnitude diagrams. For example, since the total amount of mass loss governs a star's position on the horizontal branch, a knowledge of the mass loss rate among bright cluster giants at various luminosities is crucial to understanding horizontal-branch morphology, which in turn is often used to indicate cluster age. For the first time, it is possible to characterize the behavior of mass loss as a function of luminosity explicitly among Population II giants of the same age and metallicity. We propose to do this by measuring the absorption in the blue wing of the Mg II emission line of giants spanning a range of 1.8 magnitudes near the tip of the giant branch of the globular cluster NGC6752, which is nearby, little reddened, and has many extremely blue objects whose production is encouraged by high mass loss. Many stars can be observed efficiently, since gc 6752 is in the CVZ and STIS is an imaging spectrograph. Using STIS in the echelle mode with a 70Angstrom Mg II filter, we will record high resolution spectra simultaneously for both giants and blue horizontal branch stars within a field 25" on a side. After removal of the interstellar contribution seen in the BHB stars, the mass loss indicated from the Mg II line profile will be examined for each giant, and its dependence on luminosity found directly.
No associations
LandOfFree
Mass Loss in Globular Cluster Giants: NGC 6752 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Mass Loss in Globular Cluster Giants: NGC 6752, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mass Loss in Globular Cluster Giants: NGC 6752 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-895612