The First Direct Measurement to the Diameter of a Population II Star; Observationally Determined Fundamental Properties of µ Cas A with the CHARA Array

Details The First Direct Measurement to the Diameter of a Population II Star; Observationally Determined Fundamental Properties of µ Cas A with the CHARA Array The First Direct Measurement to the Diameter of a Population II Star; Observationally Determined Fundamental Properties of µ Cas A with the CHARA Array

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5715b&link_type=abstract

American Astronomical Society, AAS Meeting #211, #57.15; Bulletin of the American Astronomical Society, Vol. 39, p.832

Other

Scientific paper

Possessing the longest optical interferometric baselines in the world, the CHARA Array is uniquely suited to measure the diameters of stars, which are generally unresolved by other optical interferometers.
Using the longest baselines of the CHARA Array, we have measured the angular diameter of the subdwarf µ Cas A, the first such determination for a halo population star. We compare this result to new diameters for the K0 V stars, σ Dra and HD 10780, and find that the metal-poor star, µ Cas A, has an effective temperature (Teff=5353±26; K), radius (R=0.779±0.004 Rsun), and absolute luminosity (L=0.4475±0.0097 Lsun) comparable to the other two stars with later spectral types. We show that these results provide a key to understanding the fundamental relationships for stars with low metallicity.
In addition, we present the current results to our survey of nearby, main sequence, A, F, and G-type stars with the CHARA Array in order to determine highly accurate angular diameters. The accuracy and target sample range are aimed at refining, as well as expanding, the existing diameter measurements, which are used in the calibration of numerous less direct methods based on photometric parameters to predict stellar diameters and effective temperatures of stars. Currently, we have measured diameters to thirty-two new objects. Research at the CHARA Array is supported by the College of Arts and Sciences at Georgia State University and by the National Science
Foundation through NSF Grant AST 0606958.

Affiliated with

Also associated with

No associations

Rating

The First Direct Measurement to the Diameter of a Population II Star; Observationally Determined Fundamental Properties of µ Cas A with the CHARA Array 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 The First Direct Measurement to the Diameter of a Population II Star; Observationally Determined Fundamental Properties of µ Cas A with the CHARA Array, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The First Direct Measurement to the Diameter of a Population II Star; Observationally Determined Fundamental Properties of µ Cas A with the CHARA Array will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1477939