Stellar Diameters and Temperatures I. Main Sequence A, F, & G Stars

Details Stellar Diameters and Temperatures I. Main Sequence A, F, & G Stars Stellar Diameters and Temperatures I. Main Sequence A, F, & G Stars

2011-12-14

arxiv.org/abs/1112.3316v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

125 pages, 12 tables, 25 figures, accepted for publication in ApJ

Scientific paper

We have executed a survey of nearby, main sequence A, F, and G-type stars with the CHARA Array, successfully measuring the angular diameters of fortyfour stars with an average precision of ~ 1.5%. We present new measures of the bolometric flux, which in turn leads to an empirical determination of the effective temperature for the stars observed. In addition, these CHARA-determined temperatures, radii, and luminosities are fit to Yonsei-Yale model isochrones to constrain the masses and ages of the stars. These results are compared to indirect estimates of these quantities obtained by collecting photometry of the stars and applying them to model atmospheres and evolutionary isochrones. We find that for most cases, the models overestimate the effective temperature by ~ 1.5-4%, when compared to our directly measured values. The overestimated temperatures and underestimated radii in these works appear to cause an additional offset in the star's surface gravity measurements, which consequently yield higher masses and younger ages, in particular for stars with masses greater than ~1.3 Msun. Additionally, we compare our measurements to a large sample of eclipsing binary stars, and excellent agreement is seen within both data sets. Finally, we present temperature relations with respect to (B-V) and (V-K) color as well as spectral type showing that calibration of effective temperatures with errors ~ 1% is now possible from interferometric angular diameters of stars.

Affiliated with

Also associated with

No associations

Rating

Stellar Diameters and Temperatures I. Main Sequence A, F, & G Stars 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 Stellar Diameters and Temperatures I. Main Sequence A, F, & G Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stellar Diameters and Temperatures I. Main Sequence A, F, & G Stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-560889